Fillable Schedule 3 Sustainable Drainage Flood & Water Management (Merthyr Tydfil County Borough Council)

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Schedule 3 Sustainable Drainage Flood & Water Management (Merthyr Tydfil County Borough Council)

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Pre-App Form FINAL Version 05_11_18
Page 1 of 32
Flood & Water Management Act 2010
Schedule 3 Sustainable Drainage
SuDS Scheme Application for SuDS Approving Body (SAB) Approval
– Wales
Application Form for Pre-Application Approval of SuDS on
new developments with reference to The Sustainable
Drainage (Approval and Adoption Procedure) (Wales)
Regulations 2018
Pre-Application Structure
Pre-Application Form
(To complete & return)
Guidance on Completing the Pre-
Application Form – including specific
information and evidence required to
support the application.
(For guidance)
Pre-App Form FINAL Version 05_11_18
Page 2 of 32
Pre-Application Form
This form is based on the requirements provided by Welsh Government for the sole
purpose of submitting information to the SuDS Approving Body (SAB) in accordance
with the legislation detailed on this form and other relevant items of primary and
subordinate legislation.
Please be aware that once you have downloaded this form, the SAB and Welsh
Government will have no access to the form of the data you enter into it. Subsequent
use of this form is solely at your discretion, including the choice to complete and
submit it to the SAB in agreement with the declaration section.
Upon receipt of this form and any supporting information, it is the responsibility of
the SAB to inform you of its obligations in regard to the processing of your
application. Please refer to its website for further information on any legal,
regulatory and commercial requirements relating to information security and data
protection of the information you have provided.
We will process the information you provide so that we can deal with your
application. We may also process or release the information to offer you documents
or services relating to environmental matters and consult the public, public
organisation and other organisations; provide information from the public register to
anyone who asks or prevent anyone from breaking environmental law, investigate
cases where environmental law may have been broken and take any action that is
needed, and respond to requests for information under the Freedom of Information
Act 2000 and the Environmental Information Regulations 2004 (if the Data
Please Note:
1. This form is for Pre-Application discussions with SAB ONLY;
2. Consideration of this application will be based on compliance with the
Statutory National Standards for Sustainable Drainage Systems (SuDS)
for Wales. and Statutory Instruments;
3. You are advised to engage early, and directly, with the LPA and all other
relevant organisations that may have an interest in your SuDS scheme
proposal, including the SAB statutory consultees listed below:
a. Sewerage undertaker
b. National Resources Wales
c. Highway Authority
d. Canal & River Trust
e. Internal Drainage Districts (NRW);
4. For a valid SuDS Scheme Pre-Application to the SAB, ALL sections
of this form MUST be completed; and
5. You are encouraged to provide an initial resp
onse to the further
questions contained in the Guidance on completing this form, and to
submit as much initial technical information as possible about your SuDS
scheme proposals (also as indicated in the Guidance); as this will assist
the SAB with pre-application considerations and discussions.
Pre-App Form FINAL Version 05_11_18
Page 3 of 32
Protection Act allows).
Please ensure that the information you submit is accurate and correct and does not
include personal or sensitive information. If you require any further clarification,
please contact the SAB directly.
If printed, please complete using block capitals and black ink prior to submitting to the
SAB.
Please read through the Guidance and complete this application form carefully. If you
fill in the application form correctly first time, the application can be processed in
shorter timescales.
Prior to the submission of a Full Application, applicants are strongly advised to
make this Pre-Application submission to discuss their proposals with the SAB
and ensure that an acceptable SuDS scheme is submitted later, at the Full
Application stage. Please note that pre-application fees will apply.
Submissions made in support of this application shall be based upon current
legislation and industry best practice including documents referenced in Guidance on
Making SuDS Applications for SAB Approval.
Proposals submitted should be developed by a competent and suitability qualified
professional, experienced in drainage/ SuDs / flood risk management design.
Where applicable, the LPA planning reference or unique identifier should be included.
Applicants should complete this form and submit it, together with relevant supporting
documents, to Merthyr Tydfil County Borough Council’s SuDs Approving Body.
Where applicable, payment of the Pre-Application fee can be made via
Credit/Debit card, BACS, Cheque (made payable to Merthyr Tydfil County
Borough Council) or in person at one of our Contact Centres. Your application
will not be processed until the application fee is received and cleared in full.
When you have completed the application form please submit the form and
associated documents to:
Electronically: SAB@Merthyr.gov.uk
Tel: 01685 725000
Postal: MTCBC SAB, Unit 5 Triangle Business Park, Pentrebach, Merthyr Tydfil.
CF48 4TQ.
If you are not sure about anything contained in the application form, please contact us.
Pre-App Form FINAL Version 05_11_18
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Content
ALL sections of this form MUST be fully completed unless otherwise stated.
1. Applicant Details
2. Site Details
3. Application
4. Environmental Impact Assessment (EiA) Statement
5. Compliance with Statutory National Standards for Sustainable Drainage
Systems (SuDS)
6. Initial Assessment of Flood Risk
7. SuDS Scheme Application Checklist
8. Declaration
Pre-App Form FINAL Version 05_11_18
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1. Applicant Details
Applicant Name and Address
Title and Name
Company (if applicable)
Suffix (unit/name/number)
Address line 1
Address line 2
Address line 3
Town
County
Postcode
Phone number
Mobile
Works
Home
e-mail address
Agent Name and Address
Title and Name
Company (if applicable)
Suffix (unit/name/number)
Address line 1
Address line 2
Address line 3
Town
County
Postcode
Phone number
Mobile
Works
Home
e-mail address
Preferred contact Applicant Agent
Pre-App Form FINAL Version 05_11_18
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2. Site Details
Name of proposed
development
Grid Reference (E/N) Easting Northing
Suffix (unit/name/number)
Address line 1
Address line 2
Address line 3
Town
County
Postcode
Description of proposed
development
Total application site area (Ha)
Is the site currently developed
i.e. Brownfield, or is it
currently undeveloped i.e.
Greenfield?
Existing land use
Proposed land use
Is this a cross border
application?
3. Application
Has any prior advice been sought from the SuDS
Approval Body (SAB) about this application?
Yes ☐ No ☐
If Yes, please complete the following information about the advice you were given.
This will help the SAB to deal with this application more efficiently.
A general description of site location supported by a plan specifying the
construction area and the extent of the drainage system should be submitted.
Plans shall be at a scale of 1:2500. All plans should show the direction of North.
Pre-App Form FINAL Version 05_11_18
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Officer Name
Reference Date DD MM YYYY
Details of pre-
application advice
received
Does this application relate to any
other SAB application already made?
Yes ☐ No ☐
If “Yes”, please provide SAB
Reference number
Is this application part of a phased
approach to development of the site,
or one of multiple applications for the
same site?
Yes ☐ No ☐
If “Yes”, please
provide brief
details
4. Environmental Impact Assessment (EiA) Statement
Does this application relate to a development that is the
subject of an EiA application under the Town & Country
Planning (Environmental Impact Assessment) (Wales)
Regulations 2017(1)?
Yes
☐
No
☐
5. Compliance with Statutory National Standards for Sustainable Drainage
Systems (SuDS)
All sustainable drainage systems MUST comply with the Statutory National
Standards for Sustainable Drainage Systems (SuDS) for Wales. You are advised
to refer to the detailed text in the Standards that relate to the information required
below.
Pre-App Form FINAL Version 05_11_18
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Standard Principles
The Principles listed below will underpin the design of surface water management
schemes to meet the Statutory National Standards. Where possible, please provide a
brief summary in each of the boxes below relating to each of the bulleted Standard
Principles and itemised Standards 1 to 6, showing how your proposed surface water
drainage scheme complies with this statutory requirement.
Compliance with Standard Principles
My proposed surface water drainage scheme will comply in the following way/s:
Where possible, relevant items of supporting information (e.g. evidence, technical
documents, plans and drawings etc.), as shown in Table A and Table B of this
Guidance should be listed below and all relevant material submitted.
Standards 1 to 6
Compliance with Standard S1 - Surface water runoff destination
My proposed surface water drainage scheme will comply in the following way/s:
Where possible, relevant items of supporting information (e.g. evidence, technical
documents, plans and drawings etc.), as shown in Table A and Table B of this
Pre-App Form FINAL Version 05_11_18
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Guidance should be listed below and all relevant material submitted.
Compliance with Standard S2 - Surface water runoff hydraulic control
My proposed surface water drainage scheme will comply in the following way/s:
Where possible, relevant items of supporting information (e.g. evidence, technical
documents, plans and drawings etc.), as shown in Table A and Table B of this
Guidance should be listed below and all relevant material submitted.
Compliance with
Standard S3
– Water Quality
My proposed surface water drainage scheme will comply in the following way/s:
Where possible, relevant items of supporting information (e.g. evidence, technical
documents, plans and drawings etc.), as shown in Table A and Table B of this
Guidance should be listed below and all relevant material submitted.
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Compliance with Standard S4 – Amenity
My proposed surface water drainage scheme will comply in the following way/s:
Where possible, relevant items of supporting information (e.g. evidence, technical
documents, plans and drawings etc.), as shown in Table A and Table B of this
Guidance should be listed below and all relevant material submitted.
Compliance with Standard S5 – Biodiversity
My proposed surface water drainage scheme will comply in the following way/s:
Where possible, relevant items of supporting information (e.g. evidence, technical
documents, plans and drawings etc.), as shown in Table A and Table B of this
Guidance should be listed below and all relevant material submitted.
Compliance with Standard S6 – Design of drainage for Construction and
Maintenance and Structural Integrity
My proposed surface water drainage scheme will comply in the following way/s:
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Where possible, relevant items of supporting information (e.g. evidence, technical
documents, plans and drawings etc.), as shown in Table A and Table B of this
Guidance should be listed below and all relevant material submitted.
6. Initial Assessment of Flood Risk
Is the site within an area at risk of flooding? Refer to
Natural Resources Wales Development Advice maps.
(Natural Resources Wales / Development and flood risk)
Yes
☐
No
☐
If the proposed development is within the area at risk of flooding, you will need to
consider whether it is appropriate to submit a flood consequences assessment.
(Refer to Technical Advice Note 15 (TAN15).
Is the site located within an area susceptible to surface
water flooding? Refer to NRW Surface Water Flood Maps.
Yes
☐
No
☐
Is the site located within an area susceptible to
groundwater flooding?
Yes
☐
No
☐
Is there a watercourse (as defined under Section 72 Land
Drainage Act 1991) located within 20m of the proposed
development?
Yes
☐
No
☐
7. SuDS Scheme Pre-application - Checklist
Please complete the following checklist and make sure you have read the
Guidance on Making SuDS Applications for SAB Approval, the Guidance on
completing the Pre-Application Form, and provided all the necessary
information in support of your application:
Pre-Application fee (30%of full application
fee)
Yes ☐
Completed, signed and dated Pre-
Application Form.
Yes ☐
Pre-App Form FINAL Version 05_11_18
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9. Declaration
Disclaimer
Information provided on this form and in supporting documents may be
published on the SABs SuDS register and website and be made publicly
available.
Considered further questions and
technical information in the Guidance,
required to help assess your Pre-
Application and assist your Full
Application proposals at a later date.
Yes ☐
I/ we hereby apply for SuDS Pre-Application Approval as described in this form and
the accompanying plans/drawings and additional information. I confirm that, to the
best of my knowledge, any facts stated are true and accurate and any opinions
given are the genuine opinions of the persons giving them.
This form is completed using accurate information and can be used as a summary
of concept of the surface water drainage strategy on this site.
Form completed by
Signature
Level of competent person
authorising this application
Company
On behalf of (Client’s details)
Date
Pre-App Form FINAL Version 05_11_18
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Guidance on completing the Pre-Application Form
This guidance comprises:
• General comments
• Further Pre- Application questions
• Questions to be answered to show compliance with Statutory National
Standards for Sustainable Drainage Systems (SuDS);
• Table A - Information and evidence; and
• Table B – Plans and drawings.
General comments
Applications for approval must be submitted using this Pre-Application form provided
by the SAB. USE OF THIS FORM IS STRONGLY ADIVISED as it has been
developed to ensure your application has due regard to the statutory requirements.
This form is for SAB approval ONLY, and you are advised to also engage early, and
directly, with the LPA and all other relevant organisations that may have an interest in
your SuDS scheme proposal, including the SAB statutory consultees listed below:
o Sewerage undertaker;
o Natural Resources Wales;
o Highway Authority;
You are advised to commence Pre-Planning Application discussions with the LPA
at the earliest opportunity, and undertake discussions with both the SAB and the LPA
simultaneously.
Development on site should not commence until formal Planning Approval AND Full
SAB Approval has been given.
It is important that you keep SAB officers and planning officers informed of progress
and decisions with regard to the planning application and the SAB application, as they
are separate applications, with different requirements, timescales and approval bodies.
Engaging in Pre-Application discussions with the SAB at the outset of your SuDS
concept design is strongly advised. Effective Pre-Application discussions and
Master Planning can ensure a robust, cost effective and viable surface water
management strategy and SuDS scheme design. SAB can help you determine the
optimum SuDS solution for your site by providing an early indication of what may or
may not comply with the National SuDS Standards.
Please provide as much technical information as possible to the SAB to enable a
considered and reasoned response to be given at both Pre-Application and Full
Pre-App Form FINAL Version 05_11_18
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Application stages. i.e. the more information provided at the Pre-Application stage,
the more detailed technical advice can be given.
The site-specific surface water drainage assessment and SuDS requirements should
be integrated with the Flood Consequences Assessment (FCA), and an integrated
Flood and Surface Water Drainage Report provided to both the LPA and the SAB.
Please refer to key national and local documents prior to, and during the concept
design, detailed design, SAB and LPA approvals, construction, adoption, operation &
maintenance of a SuDS scheme. A list of, and links to, these documents are provided
in the Guidance on Making SuDS Applications for SAB Approval.
With specific regard to the Pre-Application:
• A Pre-Application fee may be charged by the SAB;
• To ensure a valid Pre-Application, all questions on the form MUST be
answered to the best of your knowledge, and as much initial supporting
information as possible should be provided as indicated in the Guidance on
completing the Pre-Application Form;
• Your response to questions should reflect the specific requirements of the
Statutory National Standards;
• Once your application form together with any supporting material has been
correctly submitted to the SAB, it will be validated;
• Please be aware that if the questions have not been answered as indicated on
the form, and by the requirements above, your application may be refused;
• However; if deemed to be a Valid Application, your submission will be
technically assessed, and a SAB officer will contact you to commence Pre-
Application discussions;
• There is no statutory timescale relating to the Pre-Application process. This
enables an appropriate amount of time to be spent discussing, developing and
agreeing your SuDS scheme design proposals (from early concept to final
design), along with other related matters, with SAB officers; all prior to your Full
Application submission;
• To enable productive Pre-Application discussions, it’s important that you
provide as much initial technical information as early as possible in the
development process. This will assist “development specific” discussions to
commence on: site and development characterisation, surface water sub-
catchments and flow routes, and overall concept design etc.;
• Early reference to the statutory documents listed in this guidance should be
made, and the site viability to accept an appropriate SuDS scheme considered
carefully, prior to the submission of a Pre-Application;
• All technical and non-technical discussions with SAB should be undertaken as
part of the Pre-Application stage, as only in exceptional circumstances, will
SAB contact you during its assessment of the Full SuDS Scheme Application.
Pre-App Form FINAL Version 05_11_18
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• Further Pre-Application questions are provided in this guidance to indicate
where initial responses will assist your technical discussions with SAB; and
• Information contained in Table A and Table B of this guidance, is required for
the Full Application. However, please provide as much information as possible
at this Pre-Application stage to assist your technical discussions with the SAB,
prior to submitting the Full Application at a later date.
Please provide one hard copy sent to MTCBC SAB, Rm 146, Unit 5, Triangle Business
Park, Pentrebach, Merthyr Tydfil. CF48 4TQ and one electronic copy sent to
SAB@merthyr.gov.uk,
Please refer to the relevant Ciria SuDS Manual C753 chapters, and additional
references indicated.
Pre-App Form FINAL Version 05_11_18
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Further Pre-Application questions to consider at an early stage
1. Initial Surface Water Discharge Hierarchy
2. Initial Infiltration Assessment
Surface water drainage arrangements shall demonstrate the proposed surface water
drainage complies with National SuDS Standards. As much of the runoff as possible
should be discharged to each hierarchy element before a lower hierarchy element is
considered. Collection and infiltration methods of drainage are required to be
considered in the first instance. With reference to the hierarchy levels below, please
indicate your initial drainage arrangements to enable discussion with SAB. It is
recommended you also have discussions with land and asset owners at the earliest
possible stage.
1. Collect for use
2. Infiltration
3. To watercourse
a) Is it an Ordinary Watercourse?
b) Is it a Main River?
4. To surface water sewer
a) Is it a Highway drain?
b) Is it a public sewer?
c) Is it a private sewer?
d) Other?
Where infiltration drainage is proposed, testing should be carried out to a
methodology agreed with the SAB e.g. Infiltration Drainage - Manual of Good
Practice (CIRIA R156) and be used to inform the design, construction, maintenance,
testing and assessment of infiltration systems. Where possible, initial answers to the
questions below should be provided, along with any supporting surveys, reports and
other material.
Has infiltration testing been carried out?
Has there been an analysis of development Geology?
What is the depth to the highest recorded groundwater level (metres)?
Has borehole testing been carried out?
Has a Contaminated Land Assessment been undertaken?
Is the infiltration drainage proposed on contaminated land?
What is the infiltration test result (X 10
-?
)?
Pre-App Form FINAL Version 05_11_18
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3. Approximate Impermeable Area
4. Initial Calculation of Peak Discharge Rates
5. Initial Calculation of Long-Term Storage
6. Initial Calculation of Attenuation Storage
Runoff rates should be calculated in accordance with SAB agreed methodology e.g.
Flood Estimation Handbook, Revitalised Flood Estimation Handbook (ReFEH) or IoH
Report 124. Where possible, initial existing and proposed peak discharge rates in
litres/second/hectare should be provided for the event probabilities below, along with
any calculations, reports and other supporting material.
Mean Annual Peak Rate Runoff or Annual Exceedance Probability (AEP)
1 in 1
1 in 30
1in 100
Provide the approximate existing and proposed impermeable areas on the site. The
existing impermeable area will need to be evidenced via a topographical survey when
submitting the Full Application.
Long Term Storage is required to deal with the additional volume of water generated
as a result of the creation of impermeable surfaces. Where possible, initial existing
and proposed long-term storage volumes (m
3
), should be provided for the 1 in 100
(6 hour) rainfall event, along with the long-term storage volume expressed as a
depth across the whole site area (mm). Any initial calculations, reports and other
supporting material should also be provided.
Attenuation storage is provided to enable the rate of runoff from the site into the
receiving watercourse is to be limited to an acceptable rate to protect against
erosion and flooding downstream.
Where the additional volume generated by development is not dealt with, peak flow
for the 1 in 100 rainfall events shall be limited to the Mean Annual Peak Rate of
Runoff. Where possible, the attenuation storage volume (m
3
), and expressed as a
depth across the whole site area (mm) should be provided, along with any initial
calculations, reports and other supporting material.
Pre-App Form FINAL Version 05_11_18
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7. Water Quality
8. Biodiversity
9. Amenity
10. Non-performance Bond, Adoption, Operation & Maintenance
Surface water runoff should be treated via a SuDS management train to prevent
negative impacts on the receiving water quality and/or protect downstream drainage
systems, including sewers. Initial information on water quality treatment methods via
a SuDS management train should be provided where possible, and be supported
by any calculations, reports and other available material.
Potential benefits to biodiversity should be maximised as part of the development.
The SuDS design should ensure, where possible, ecologically rich green and blue
corridors are provided by linking natural habitats and ecosystems throughout the
site. Initial information on incorporating green and blue corridors in the SuDS
concept design to enhance biodiversity should be provided where possible and
be supported by any reports and other available material.
Where possible, SuDS should enhance the provision of high quality, attractive public
space which can help provide health and wellbeing benefits. Initial information on
incorporating enhanced amenity, including public space in the SuDS concept
should be provided where possible and be supported by any reports and other
available material.
It’s important that consideration at the SuDS design concept stage, is given to the
estimated cost of the SuDS construction work, SuDS adoption arrangements and
SuDS maintenance responsibilities, activities and frequencies, for the lifetime of the
development. Any initial thoughts, calculations and other information regarding these
topics should be provided where possible.
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Questions to be answered to show compliance with Statutory National
Standards for Sustainable Drainage Systems (SuDS)
Where possible for each of the Standards, relevant items of supporting
information (e.g. evidence, technical documents, plans and drawings etc.), as
shown in Table A and Table B of this Guidance, should be listed on the application
form and all relevant material submitted.
Standard Principles
The Principles listed below underpin the design of surface water management
schemes to meet the Statutory National Standards for Sustainable Drainage Systems
(SuDS) for Wales. Where possible, please provide a brief summary relating to each
Principle, showing how your proposed surface water drainage scheme complies with
this statutory requirement.
Compliance with Standard Principles
The SuDS scheme requirements are shown below:
1. How do you propose to manage water on or close to the surface and as close
to the source of the runoff as possible?
(see Standard S1 and Standard S2)
2. How do you propose to treat rainfall as a valuable natural resource?
(see Standard S1 and Standard S2)
3. How do you propose to ensure pollution is prevented at source, rather than
relying on the drainage system to treat or intercept it?
(see Standard S3)
4. How do you propose to manage rainfall to help protect people from increased
flood risk, and the environment from morphological and associated ecological
damage resulting from changes in flow rates, patterns and sediment
movement caused by the development?
5. How do you propose to take account of likely future pressures on flood risk,
the environment and water resources such as climate change and urban
creep?
6. How do you propose to use the SuDS Management Train, using drainage
components in series across a site to achieve a robust surface water
management system (rather than using a single “end of pipe” feature, such as
Pre-App Form FINAL Version 05_11_18
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a pond, to serve the whole development)?
(see Standard S1, Standard S2 and Standard S3)
7. How do you propose to maximise the delivery of benefits for amenity and
biodiversity?
(see Standard S4 and Standard S5)
8. How do you propose to make the best use of available land through
multifunctional usage of public spaces and the public realm?
9. How do you propose that the SuDS scheme performs safely, reliably and
effectively over the design life of the development taking into account the need
for reasonable levels of maintenance?
(see Standard S6)
10. How do you propose to avoid the need for pumping where possible?
11. How do you propose to ensure the scheme is affordable, taking into account
both construction and long-term maintenance costs and the additional
environmental and social benefits afforded by the system?
12. Applications should be accompanied by proposals for a maintenance plan and
the means of funding for the scheme for its design life.
Standard S1 - Surface water runoff destination
The requirements of Standard S2 listed below address the use of surface water by the
development and where it should be discharged. The aim is to ensure that runoff is
treated as a resource and managed in a way that minimises negative impact of the
development on flood risk, the morphology and water quality of receiving waters and
the associated ecology. This will ensure that early consideration is given to the use of
rainwater harvesting systems to both manage runoff and deliver a source of non-
potable water for the site where practical. Where it is not, prioritisation should be given
to infiltration. Discharges to sewerage systems should be limited where possible.
As much of the runoff as possible (subject to technical or cost constraints) should be
discharged to each destination before a lower priority destination (level) is considered.
Depending on the site characteristics, drainage from different parts of the site could
have different drainage destinations.
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Depending on the quantity of runoff and the potential for a particular destination to
manage that runoff, small events may discharge to a higher level while larger events
may need to make use of lower priority destinations.
Compliance with Standard S1 - Surface water runoff destination
Priority Level 1 is the preferred (highest priority) and 4 and 5 should only be used
in exceptional circumstances.
Proposed drainage scheme runoff destinations, and the reasons for proposing
these, should be indicated as shown below. If/where Priority Level 1 or Priority
Level 2 run off destination/s are unable to be achieved, the reasons for this should
also be provided.
Priority Level 1: Surface water runoff is collected for use.
Priority Level 2: Surface water runoff is infiltrated to ground.
Note: If any runoff is not infiltrated to ground, and a lower priority level of surface water runoff destination is proposed,
“Exception Criteria” MUST be demonstrated and evidence provided.
Priority Level 3: Surface water runoff is discharged to a surface water body.
Priority Level 4: Surface water runoff is discharged to a surface water sewer,
highway drain, or another drainage system.
Priority Level 5: Surface water runoff is discharged to a combined sewer.
Note: Strong presumption against discharge to a combined sewer.
Standard S2 - Surface water runoff hydraulic control
The aim of Standard S2 listed below is to manage the surface water runoff from, and
on a site, to protect people on the site from flooding from the drainage system for
events up to a suitable return period. Also, to mitigate any increased flood risk to
people and property downstream of the site as a result of the development, and to
protect the receiving water body from morphological damage.
Compliance with Standard S2 - Surface water runoff hydraulic control
The SuDS scheme should comply with the following:
1. Surface water should be managed to prevent, so far as possible, any discharge
from the site for the majority of rainfall events of less than 5mm.
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2. The surface water runoff rate for the 1 in 1 year return period event should be
controlled to help mitigate the negative impacts of the development runoff on
the morphology and associated ecology of the receiving surface water bodies.
3. The surface water runoff (rate and volume) for the 1 in 100 year return period
event should be controlled to help mitigate negative impacts of the development
on flood risk in the receiving water body.
4. The surface water runoff for events up to the 1% (1 in 100 year) return period
(or agreed equivalent) should be managed to protect people and property on
and adjacent to the site from flooding from the drainage system.
5. The risks both on site and off site associated with the surface water runoff for
events greater than the 1 in 100 year return period should be considered.
Where the consequences are excessive in terms of social disruption, damage
or risk to life, mitigating proposals should be developed to reduce these
impacts.
6. Drainage design proposals should be examined for the likelihood and
consequences of any potential failure scenarios (e.g. structural failure or
blockage), and the associated flood risks managed where possible.
Standard S3 – Water Quality
Standard S3 shown below addresses the drainage design requirements to minimise
the potential pollution risk posed by the surface water runoff to the receiving water
body.
Compliance with Standard S3 – Water Quality
The SuDS scheme should comply with the following:
1. Surface water runoff should be treated to prevent negative impacts on the
receiving water quality and/or protect downstream drainage systems, including
sewers.
Standard S4 – Amenity
Standard S4 shown below addresses the design of SuDS components to ensure that,
where possible, they enhance the provision of high quality, attractive public space
which can help provide health and wellbeing benefits, they improve liveability for local
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communities and they contribute to improving the climate resilience of new
developments.
Compliance with Standard S4 – Amenity
The SuDS scheme should comply with the following:
1. The design of the surface water management system should maximise amenity
benefits.
Standard S5 – Biodiversity
Standard S5 shown below addresses the design of SuDS to ensure that, where
possible, they create ecologically rich green and blue corridors in developments and
enrich biodiversity value by linking networks of habitats and ecosystems together.
Biodiversity should be considered at the early design stage of a development to
ensure the potential benefits are maximised.
Compliance with Standard S5 – Biodiversity
The SuDS scheme should comply with the following:
1. The design of the surface water management system should maximise
biodiversity benefits.
Standard S6 – Design of drainage for Construction and Maintenance and
Structural Integrity
Standard S6 shown below deals with designing robust surface water drainage systems
so that they can be easily and safely constructed, maintained and operated, taking
account of the need to minimise negative impacts on the environment and natural
resources.
Compliance with Standard S6 – Design of drainage for Construction and
Maintenance and Structural Integrity
The SuDS scheme should comply with the following:
1. All elements of the surface water drainage system should be designed so that
they can be constructed easily, safely, cost-effectively, timely manner, and with
the aim of minimising the use of scarce resources and embedded carbon
(energy).
2. All elements of the surface water drainage system should be designed so that
maintenance and operation can be undertaken (by the relevant responsible
body) easily, safely, cost-effectively, in a timely manner, and with the aim of
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minimising the use of scarce resources and embedded carbon (energy).
3. The surface water drainage system should be designed to ensure structural
integrity of all elements under anticipated loading conditions over the design life
of the development site, taking into account the requirement for reasonable
levels of maintenance.
Note:
Information provided may be published on the SABs SuDS register and
website and be made publicly available.
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TABLE A:
Specific information and evidence required for the Pre-Application
Flood Consequences Assessment (FCA) – (See
Technical Advice Note 15:
Development and Flood Risk (TAN15)
REASON: To show existing and future flood risks to and from the site, and how these will
be managed to ensure people and property remain safe for the lifetime of the development.
The assessment will include:
• The requirements of TAN 15; and
• Frequent references and links to relevant planning conditions, reserved planning
matters, and to the FCA.
Detailed Geotechnical Factual and Interpretive Report – (See also specific Ciria SuDS
Manual C753 Chapters 13 & 25)
REASON: To show existing on site and relevant off-site physical properties of soils, rocks
and features, and demonstrating that the proposed method of surface water drainage is
appropriate for the geology of the site; and will continue to perform to its design criteria for
the lifetime of the development. The report will include:
• Topography, geology & site history;
• Significant constraints (incl. soluble rocks, landslides, shallow mining, shallow
groundwater, made ground, contaminated land);
• Drainage potential (incl. depth to water table, permeability of superficial deposits,
thickness of superficial deposits, permeability of bedrock, presence of floodplains);
• Ground stability (incl. soluble rocks, landslides, shallow mining, running sands,
swelling clays, compressible ground, collapsible ground);
• British Geological Survey BGS GeoSure Maps (incl. artificial deposits, superficial
deposits, bedrock);
• Borehole & trial pit locations, monitoring & any related information;
• Detailed infiltration assessment (incl. evidence of soil types, soil infiltration
coefficients & Standard Percentage Run-off (SPR) calculations);
• Where pervious pavements are proposed in certain soil types, soaked CBRs are
required;
• Laboratory work;
• Where possible, detailed evidence of groundwater table levels over recent 12-month
period or other validated evidence; and
• Groundwater levels and location of, and impacts on:
- Surface Water Safeguard Zones
- Groundwater Safeguard Zones,
- Water Protection Zones, and/or
- Groundwater Nitrate Vulnerable Zones.
Detailed Whole Site SuDS Drainage Design Proposals–(See also Ciria SuDS Manual C753)
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REASON: To confirm that the proposed drainage solution is appropriate for the location,
type, scale and nature of the site and development proposed; and to demonstrate that flood
risk will be reduced, to ensure people and property remain safe for the lifetime of the
development. The proposals will include:
• Drainage Strategy;
• Masterplan;
• Reference and alignment to the Local Flood Risk Management Strategy (LFRMS);
• Approved Flood Consequences Assessment (FCA) including:
- existing hydrology,
- greenfield & brownfield runoff rate calculations,
- critical duration rainfall events,
- simulation results for design storm RP, 1 in 1 RP, 1 in 2 RP, 1 in 30 RP and
1:100 RP,
- appropriate % allowance for climate change and urban creep,
- historical flood events and groundwater levels,
- risks (both on site and off site) associated with surface water runoff for events
greater than the 1% (1 in 100 year) return period,
- descriptions of existing drainage assets and features,
- current and future flood risks including:
- surface,
- groundwater,
- other sources,
- exceedance flood flow paths,
- discharges,
• Existing and proposed impermeable and permeable areas (runoff betterment
required of min 30% or equivalent to greenfield on existing brownfield areas);
• Models (as appropriate) and detailed hydraulic calculations;
• Detailed SuDS design including:
- Interception incl. mechanisms and summer and winter interception
compliance targets (e.g. summer 80% & winter 50%),
- treatment,
- conveyance,
- peak flow and volume control (1:100y - 6 hr rainfall event for peak volume
control),
- surface storage (long-term and attenuation),
- underground storage,
- use of vegetation and trees,
- exceedance routes and components (for 1:100y rainfall event or greater),
- demonstration that the required storages and conveyance flows can be
delivered on site,
- minimum throttle outlet flow rates (i.e. 1-2 l/s/ha or 5 l/s/ha where risk of
blockage and no other viable alternative),
- risks and consequences of design failure scenarios,
• Surface water storage; calculations including time to discharge from full to half full;
• Infiltration calculations including:
- stated safety factor,
- stated infiltration rate at 1 x 10-5 m/s or higher,
• Outfalls & discharges (normally 2 l/s/ha is considered an appropriate rate so as not to
increase flood risk downstream);
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• Specifications for all materials used in the design;
• Components can be constructed, operated and maintained easily, safely and cost
effectively;
• Components retain structural integrity for the lifetime of the development;
• Components demonstrated to resist all imposed design loadings with specified factors
of safety;
• Evidence to enable SAB to calculate the Non-performance Bond value incl. unit
rates for each SuDS component;
• Drainage related flood risk mitigation measures, stating their location, type and
features (i.e. roads & access areas protected to 1:30y rainfall, internals & critical
infrastructure protected to 1:100y rainfall or greater, appropriate freeboard);
• Multiple use of SuDS benefits incl. temporary flooded areas; and
• Future ownership of surface water drainage assets and adoptions.
Detailed SuDS Assets Maintenance Plan – (See also specific Ciria SuDS Manual C753
Chapter 32 & Appendix B)
REASON: To confirm that the SuDS management train and individual SuDS components
will be effectively maintained (including asset replacement where necessary), to perform to
their design criteria for the lifetime of the development. The plan shall include:
• Information on how SuDS will be managed & maintained, & who will do it;
• Details of future vehicular & pedestrian access arrangements;
• Information on the various human, plant & materials resources needed & broad
timescales as to when; and
• Sympathetic to the need to promote the biodiversity supported by the SuDS system.
Amenity and Biodiversity Plan – (See also specific Ciria SuDS Manual C753 Chapters 5
& 6)
REASON: To demonstrate how the SuDS will protect and enhance amenity and
biodiversity for the lifetime of the development. The plan shall include:
• How the amenity value from a SuDS scheme for the development will be
maximised for the local and wider community;
• Amenity providing clean water, SuDS legibility, safe access, multiple functionality
and attractive spaces, social value and adaptable to change;
• Bio-diversity providing clean water, connectivity along the management train and
habitat creation;
• Details of amenity and biodiversity value, and the linkages between them; and
• Proposals to benefit priority habitats and maintain or enhance others where
possible.
Unstable and Contaminated Land Reports – (See also specific Ciria SuDS Manual C753
Chapters 4 & 26)
REASON: To identify the presence, location and nature of any unstable and/or
contaminated land on or close to the site; and how this has been taken account of in the
SuDS scheme design, and how it will be managed and maintained for the lifetime of the
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development. The reports shall include any pollution remediation strategies.
Water Quality Treatment and Pollution Prevention Strategy and Plan – (See also
specific Ciria SuDS Manual C753 Chapters 4,26 & 27)
REASON: To show how the SuDS proposal will avoid or minimise the generation of
pollutants and how it will prevent pollutants mixing with runoff before it enters the drainage
system. The plan shall include:
• Supporting current or future quality objectives for the water body over the lifetime of
the development;
• Evidence of pollution risk screening and that the minimum water quality
management requirements have been considered & are able to be met (using.
SuDS Manual (Table 4.3), CIRIA 2015;
• Information on type & strength of contaminants & polluting materials;
• How have these potential contaminants been managed close to the source & on
the surface;
• Details of what SuDS components have been provided in series (the SuDS train)
to cleanse flow prior to point of discharge;
• Information on how sediment is trapped & retained on site (for rainfall events
greater than 1:1 year return period);
• Details of accessibility to undertake sediment cleansing & other maintenance
activities;
• Details of how the impacts from accidental spills been addressed; and
• Written evidence of discussion & agreement with Natural Resources Wales.
Landscape Plan – (See also specific Ciria SuDS Manual C753 Chapter 29)
REASON: To show how the proposed soft landscape features work in harmony with the
overall objectives of SuDS, and how the landscape supports and enhances flood risk
reduction, improved water quality, amenity and biodiversity. The plan shall include:
• Detailed overall layout, ground contouring, planting, hard, soft & water features;
• Detail landscape elements to improve water quality;
• Show how the design achieves effective attenuation, flow control & exceedance;
• Improvements to ecology & biodiversity;
• Detailed consideration of effective routine & periodic maintenance activities;
• Full understanding of the sites character: slope, gradient, ground modelling,
geology, soils types, natural drainage patterns;
• Show existing features to be preserved, enhanced, removed &/or replaced; and
• Details of any soils stabilization/reinforcement & erosion control.
Construction Management Plan – (See also specific Ciria SuDS Manual C753 Chapter
31 & Appendix B, and CIRIA report C768 - Guidance on the construction of SuDS)
REASON: To provide a structured approach to the construction activities and temporary
works deployed for constructing SuDS, ensuring that key construction site issues such as
drainage, flooding, sediment control, pollution prevention, compression of infiltration areas,
storage of materials & existing amenity and natural habitats etc. are sensitively and
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effectively managed until the site construction is complete. The plan shall include:
• Details of the nature of the work to be completed;
• Site plans & full scheme drawings, where required to support the method of
approach;
• Consents & reinstatement requirements;
• Access points & details;
• Any site-specific ecological issues, or features that require protection &/or
consideration;
• Pollution control arrangements & any likely water quality issues resulting from the
highways & SuDS construction;
• Proposed strategy for sediment control, erosion control & site drainage during the
construction of the development; where this impacts on the SuDS proposed for the
site, it should identify any potential impacts on the final performance of the drainage
system & any necessary protection measures or remedial works; and
• Measures to prevent the inadvertent access across the completed or partially
completed SuDS.
Construction Phasing Plan – (See also specific Ciria SuDS Manual C753 Chapter 31 &
Appendix B, and CIRIA report C768 - Guidance on the construction of SuDS)
REASON: To clearly state how the development and/or phase/s of the development will
drain during the construction and occupation of the development prior to adoption. The plan
shall include:
• The sequencing of phases of the development and how the drainage systems
(permanent or temporary) connect to an outfall (temporary or permanent) during the
construction and occupation of the development prior to adoption.
Information and communications plan (where appropriate) – (See also specific Ciria
SuDS Manual C753 Chapter 34)
REASON: To provide a structured approach to engagement with the local community and
set out the engagement stages, how they are delivered, the resources available to deliver
them, and the timescale within which an outcome needs to be delivered. The plan shall
include:
• communication with and education of existing residents;
• communication with and education of new residents;
• site and SuDS component specific information boards; and
• local community education and education strategies (eg through schools).
Construction (Design and Management) CDM Regulations 2015 File – (See also
specific Ciria SuDS Manual C753 Chapter 36 & Appendix B)
REASON: To ensure that SuDS designs fulfil regulatory and legal requirements, and SuDS
health and safety risk assessments are in line with BS EN 31010:2010. The file shall
include:
•
Risk assessments for the design, construction, operation and maintenance of the
highway and drainage system.
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Statutory consents and permissions
REASON: To provide evidence that all necessary consents and permissions have been
obtained. These shall include:
•
Discharge consents & licenses to watercourses;
•
Rights to lay pipes on third party land/easements;
•
Easement details;
•
Permission from riparian owner to discharge;
•
Water Industry Act 1991 Section 104 (adoption) and Section 106 (Connection)
agreements from
Statutory Undertaker; and
•
Land drainage consent & management company drainage agreements.
Title documents
REASON: To ensure all legal interests and ownership etc. in land and buildings associated
with the SuDS are identified, and can be communicated for legal transfers, acquisitions and
responsibilities. These shall include
•
Up-to-date coloured Copy Entries of Title or Epitome of Title to the land in question.
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TABLE B:
Plans and drawings required for the Pre-Application
Drawing number issue sheet
Outline or Full Planning Permission Notice and approved layout drawing (where
applicable).
Site location plan (Scale 1:2500) supported by recent photographs.
Natural and artificial drainage catchment and sub-catchment plan (Scale 1:2500)
showing:
• Land contours;
• Topography;
• Watercourses; and
• Current flood risk areas, both within, above and below, impacting on the site.
Concept drawings (Scale 1:2500) of the proposed development layout (and/or layout
options), appropriate and proportionate evidence showing:
• Contoured flood routing plan showing exceedance flows;
• Outline sizing of site areas and land use zones;
• Conceptual SuDS calculations and design including:
- interception,
- treatment,
- conveyance,
- peak flow and volume control,
- storage (long-term and attenuation)
- exceedance routes and components
- demonstration that the required indicative storages and conveyance flows can be
delivered on site
- protection and enhancement of:
water quality,
amenity,
bio-diversity,
landscape.
• Location of roads, buildings and sustainable drainage features (including water quality
measures);
• Potential flood risk protection features that may be required; and
• Initial thoughts on SuDS adoption & maintenance responsibilities.
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Longitudinal section coloured drawings (Scale 1:500 Horizontal & 1:100 Vertical)
showing:
•
Existing and proposed road levels for the centre line, channels, gradients and vertical
curves;
•
Surface and foul water drainage profiles, including positions of chambers, gradients,
pipe diameters, cover and invert levels and protection;
•
Highway drainage should be identified in a different colour;
•
Pipe material;
•
Pipe strength;
•
Bedding classification and details; and
•
Ground water and watercourse levels.
Cross section drawings and standard detail drawings (Scale 1:100, 1:50, 1:20 & 1:10)
showing items in the general engineering layout drawings, at intervals of no greater than 30
metres.
Landscaping layout drawing (Scale 1:500)
showing:
• Details of planting, trees species /size/positions;
• Any existing trees to be retained;
• Tree pit details;
• Grassed areas play grounds and equipment;
• Fencing and, walls; and
• Confirmation of land ownership.
Specialist drawings (Scale 1:1250)
showing:
•
Bridges, Culverts, any pipework over 600mm diameter, headwalls, retaining walls and
any other constructed features; and
•
Existing Statutory Services and utility plans showing surrounding location of proposed
development.
• Should the developer wish to submit AutoCAD files, he should attach the
relevant pen setting files (ctb).
• Plans should be folded to A4 size.
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Schedule 3 Sustainable Drainage Flood & Water Management (Merthyr Tydfil County Borough Council)

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Completed 19 December 2020

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