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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Full App Form FINAL Version 05_11_18
Page 1 of 35
Flood & Water Management Act 2010
Schedule 3 Sustainable Drainage
SuDS Scheme Application for SuDS Approving Body (SAB)
Approval – Wales
Application Form for Full Application Approval of SuDS on
new developments in accordance with The Sustainable
Drainage (Approval and Adoption Procedure) (Wales)
Regulations 2018
Full
Application
S
tructure
Full Application Form
(To complete & return)
Guidance on Completing the Full
Application Form – including specific
information and evidence required to
support the application.
(For guidance)
(Use hyperlinks above to directly access the Form and Guidance)
Full App Form FINAL Version 05_11_18
Page 2 of 35
Full 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
Please Note:
1. This form is for a Full SuDS Scheme Application for SAB approval
ONLY;
2. Approval of this application will be based on compliance with the
Statutory National Standards for Sustainable Drainage Systems (SuDS)
for Wales. and Statutory Instruments;
3. Once this application is made to SAB, it will be determined solely on the
written technical and other information submitted with the full application;
4. You are strongly advised to have previously submitted a Pre-Application
form to SAB, and engaged early, and directly, with the SAB, 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);
5. For a valid SuDS Scheme Full Application to the SAB, all sections
of this form MUST be fully completed; and
6. You are also required to provide technical information as indicated
in the Guidance (or as otherwise directed by the SAB during Pre-
Application discussions).
Full App Form FINAL Version 05_11_18
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of Information Act 2000 and the Environmental Information Regulations 2004 (if
the Data 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
ensuring all boxes are completed fully. If you fill in the application form correctly first
time, the SAB can process it quicker.
Prior to the submission of this Full Application, applicants are strongly
advised to make a Pre-Application submission to discuss their proposals with
the SAB and ensure that an acceptable SuDS scheme is submitted. Please
note that pre-application fees may apply.
Submissions made in support of this application shall be based upon current
legislation and industry best practice including documents referenced in the
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 must be included.
Applicants should complete this form and submit it, together with the necessary
supporting documents, to Merthyr Tydfil Council Borough Council’s SuDs Approving
Body.
Payment of the Full Application fee can be made via Credit/Debit card, BACS
or Cheque which should be made payable to Merthyr Tydfil Council Borough
Council. Please note 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 either electronically or by post to:
Email: SAB@merthyr.gov.uk. (Please note there is a 10MB limit to email sizes)
Phone: 01685 725000
Postal: MTCBC SAB, Rm 146, 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.
Full App Form FINAL Version 05_11_18
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Content
ALL sections of this form MUST be fully completed
1. Applicant Details
2. Site Details
3. Interest in Land
4. Application
5. Application Fee
6. Environmental Impact Assessment (EiA) Statement
7. Compliance with Statutory National Standards for Sustainable Drainage
Systems (SuDS)
8. Assessment of Flood Risk
9. Surface Water Discharge Hierarchy
10. Infiltration Assessment
11. Non-performance Bond, Adoption, Operation & Maintenance
12. SuDS Scheme Application Checklist
13. Declaration
Full App Form FINAL Version 05_11_18
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1. Applicant Details
Applicant Name and Address
Title and Name
Company
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
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
Full 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 existing site
currently
developed i.e. Brownfield or is it
currently undeveloped i.e.
Greenfield?
Existing use
Proposed use
Does the site cross more than one
SAB area?
Yes ☐ No ☐
If “Yes”, please confirm the proportionate area in each SAB below:
(The main contact will be the SAB that has most of the surface water
drainage system within its boundary.)
A general description of site location supported by a plan specifying the
construction area and the extent of the drainage system for which approval is
sought MUST be submitted. Plans shall be at a scale of 1:2500. All plans MUST
show the direction of North.
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SAB % of Site Area
3. Interest in the Land
What interest do you have in the land?
Owner
Yes ☐ No ☐
Prospective Owner
Yes ☐ No ☐
Other (please provide details)
4. Application
Has any prior advice been sought from the 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.
Officer Name
Reference
number
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
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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
Is this application one of
two or more
applications made at the same time,
each setting out an alternative
proposal for construction of a
drainage system
Yes ☐ No ☐
If “Yes”, please
provide details of
other
applications
made at the same
time (include
SAB Reference
number if
available)
5. Application Fee
Area of Land
(Ha)
Fraction Fees
Application fee N/A N/A £350.00
Each 0.1ha or fraction
of 0.1ha, for first 0.5ha
£70.00
Each 0.1ha or fraction
of 0.1ha, from 0.5ha up
to and including 1ha
£50.00
It is recommended you contact the SAB directly to ensure the correct fee is paid
with the application.
Full App Form FINAL Version 05_11_18
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Each 0.1ha or fraction
of 0.1ha, from 1ha up to
and including 5ha
£20.00
Each additional 0.1ha or
fraction of 0.1ha above
5Ha.
£10.00
Is the applicant a
town/community council?
If yes, application fee is half
the amount
If applicable – reduction of 50% application fee due to this
being an alternative proposal made at the same time.
If applicable – application fee adjustment due to cross-SAB
area approvals needed.
Total Fees
6. 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
☐
7. Compliance with Statutory National Standards for Sustainable Drainage
Systems (SuDS)
Standard Principles
The Principles listed below will underpin the design of surface water management
schemes to meet the Statutory National Standards. 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 drainage scheme complies
with this statutory requirement.
Compliance with Standard Principles
My proposed surface water drainage scheme will comply in the following way/s:
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. The Standards are re-produced, in the Guidance to assist in completing
this application form.
Full App Form FINAL Version 05_11_18
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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
MUST 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:
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
MUST 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:
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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
MUST 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:
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
MUST be listed below, and all relevant material submitted.
Compliance with Standard S4 – Amenity
My proposed surface water drainage scheme will comply in the following way/s:
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
MUST be listed below, and all relevant material submitted.
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Compliance with Standard S5 – Biodiversity
My proposed surface water drainage scheme will comply in the following way/s:
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
MUST 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:
Relevant items of supporting information (e.g. evidence, technical documents,
plans and drawings etc.), as shown Table A and Table B of this Guidance MUST
be listed below, and all relevant material submitted.
8. 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
☐
Full App Form FINAL Version 05_11_18
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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
☐
9. Surface Water Discharge Hierarchy
Level Yes No
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
☐ ☐
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 proposed drainage arrangements.
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a. Is it a Highway drain?
☐ ☐
b. Is it a public sewer?
☐ ☐
c. Is it a private sewer?
☐ ☐
d. Is it a Combined sewer?
☐ ☐
e. Other
☐ ☐
10. Infiltration Assessment
Has infiltration testing been carried out?
Yes ☐ No ☐
Analysis of development Geology (including both
bedrock and superficial deposits where known)
Depth to groundwater (metres) metres
Borehole testing
Reference
Date 7565
Has a Contaminated Land Assessment been
undertaken?
Yes ☐ No ☐
Has advice been sought from the asset owners?
Yes ☐
No ☐
Has advice been sought from the land owners?
Yes ☐
No ☐
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 BRE Soakaway Design (DG 365 – 2016), and be used
to inform the design, construction, maintenance, testing and assessment of
infiltration
systems.
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Is the infiltration drainage proposed on
contaminated land?
Yes ☐ No ☐
Infiltration test result X 10
-?
11. Non-performance Bond, Adoption, Operation & Maintenance
12. SuDS Scheme Application Checklist
Non
-
performance
Bond – Estimated
cost of work
Adoption (including
land agreements etc)
Funded Maintenance
Plan for the lifetime
of the development
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 Full Application Form, and provided all the necessary information in support of
your application:
Correct Full Application fee?
Yes ☐
Completed, signed and dated Full
Application form?
Yes ☐
What are your proposals regarding cost of works, adoption and maintenance of the
SuDS scheme?
Full App Form FINAL Version 05_11_18
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Plan/s specifying the construction area
and the extent of the drainage system
for which approval is sought. All plan/s
shall be at a scale of 1:2500 and MUST
show the direction of North.
Yes ☐
Taken account of SAB Guidance on
technical information to be submitted
to enable SAB to assess your Full
Application.
Yes ☐
Full App Form FINAL Version 05_11_18
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13. 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.
I/ we hereby apply for SuDS Approval as described in this form and the
accompanying plans/drawings and additional information. I confirm that I have read
and complied with the National SuDS Standards and, 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 has been completed using evidence from the Flood Consequences
Assessment where applicable, surface water drainage strategy and site plans and
associated documents.
This form has been completed using accurate information. It can be used as a
summary of the detailed surface water drainage proposals on this site, and clearly
shows that these drainage proposals conform to the National SuDS Standards for
Wales.
Form completed by
Signature
Position of competent person
responsible for authorising
this application
Company (if applicable)
On behalf of (Client’s details)
Date
Full App Form FINAL Version 05_11_18
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Guidance on completing the Full Application Form
This guidance comprises:
General comments
Detailed 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 Full Application form
provided by the SAB. USE OF THIS FORM IS MANDATORY 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 also 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:
o Sewerage undertaker;
o Natural Resources Wales;
o Highway Authority;
o Canal & River Trust; and
o Internal Drainage Districts (NRW).
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.
Full App Form FINAL Version 05_11_18
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Please provide as much technical information as possible to the SAB to enable a
considered and reasoned response to be given at both the Pre-Application and
Full 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 Full Application:
• To ensure a Valid Application, all questions on the form MUST be answered,
and ALL supporting material MUST be submitted as indicated in the
Guidance on completing the Full Application Form (or as otherwise
agreed with the SAB);
Your response to questions should be comprehensive and reflect the specific
requirements of the Statutory National Standards;
Once your application form together with any supporting material has been
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
will be automatically refused;
If deemed to be a valid application, your submission will be technically
assessed by the SAB;
Once a Full SuDS Scheme Application is received, the SAB will determine it
solely on the written technical and other information submitted with the full
application;
Only in exceptional circumstances, will SAB contact you during its
assessment of the Full SuDS Scheme Application, therefore it’s essential
that any technical uncertainties or issues are dealt with by all parties as part of
the Pre-Application process, and prior to the Full Application being
submitted;
In accordance with the statutory requirements, SAB will notify you of the
outcome of its technical assessment of your Full Application; and
The Full Application may be Approved subject to Conditions or it may be
Refused, in which case you will be informed of the reasons why.
Please provide one hard copy and one electronic copy sent to SAB@merthyr.gov.uk.
Full App Form FINAL Version 05_11_18
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Please refer to the relevant Ciria SuDS Manual C753 chapters, and additional
references indicated.
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Detailed questions to be answered to show compliance with Statutory National
Standards for Sustainable Drainage Systems (SuDS)
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, MUST 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
Full 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.
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Depending on the site characteristics, drainage from different parts of the site could
have different drainage destinations.
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, MUST 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 MUST
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 MUST comply with the following:
1. Surface water should be managed to prevent, so far as possible, any discharge
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from the site for the majority of rainfall events of less than 5mm.
2. The surface water runoff rate for the 1 in 1-year return period event (or agreed
equivalent) 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% (1 in 100 year) return
period event (or agreed equivalent) 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% (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 MUST 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.
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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 communities and they contribute to improving the climate resilience of new
developments.
Compliance with Standard S4 – Amenity
The SuDS scheme MUST 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 MUST 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 MUST 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).
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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
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
Full 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 all Ciria SuDS
Manual C753 Chapters)
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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 containing relevant information required for the
Full 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.
General engineering layout coloured drawings (Scale 1:500 & 1:1250) showing:
Areas of proposed SuDS submitted for SAB approval & offered for adoption – coloured
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green with solid red outline;
Site Boundaries;
Existing buildings (on and around the site);
Positions of all carriageways, footways, footpaths, cycleways, verges, service strips,
traffic calming features;
Existing and proposed foul and surface water drainage, highway drainage to be offered
for adoption by the Highway Authority, & any highway drainage not to be adopted,
need to be identified in different colours & clearly labelled;
Where applicable, each dwelling draining private surface water to the highway SuDS,
should be clearly identified on the plan and coloured differently;
Watercourses;
Finished building ground floor levels;
Manholes;
Storage/attenuation devises, chambers and systems;
Outfalls/headwalls;
Other ancillary systems/features;
Existing trees and proposed locations;
Easements to be coloured blue;
Position of dwellings, garaging and/or parking spaces, structures; and
Falls and cross-falls of SuDS components, footways and carriageways.
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.
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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.
It should be noted that:
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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