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LEXINGTON-FAYETTE URBAN COUNTY GOVERNMENT DIVISION OF ENGINEERING EXECUTIVE (Lexington-Fayette Urban County Government)

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New Development v10.1.16 1
LEXINGTON-FAYETTE URBAN COUNTY GOVERNMENT
DIVISION OF ENGINEERING
EXECUTIVE SUMMARY
STORMWATER MANAGEMENT PLAN
FOR
Name and Address of New Development Project
New Development v10.1.16 2
EXECUTIVE SUMMARY
STORMWATER MANAGEMENT PLAN
FOR
Name of New Development Project
Table of Contents
Page 1 – Cover Page
Page 2 – Table of Contents and Certification Statement
Page 3 – General Information
Page 4 – Detention Requirements
Page 5 – Detention Basin Data Form
Page 6 – Summary of Peak Outflows
Page 7 – Water Quality Requirements
Page 8 – Water Quality Data Form
Page 9 – Submittal Checklist
Page 10 – List of Supplemental Information Provided in the Appendix
Certification:
I certify that this executive summary was prepared by me or others under my supervision, and
that a copy is being provided to the New Development Section in the Division of Engineering
and the MS4 / Water Quality Manager in the Division of Water Quality.
Date
Engineer’s Signature and Kentucky License No.
Printed Name
Name of Engineering Firm
click to sign
signature
click to edit
New Development v10.1.16 3
GENERAL INFORMATION
Project Name:
Site Address:
Owner/Developer (Name, email address, phone number):
Engineer (Name, email address, phone number):
Watershed:
Boone Creek Cane Run East Hickman KY River
North Elkhorn South Elkhorn Town Branch West Hickman
Wolf Run
Royal Spring Wellhead Protection Area
U. S. Army Corps of Engineers Jurisdictional Streams and Wetlands
Stream Length (feet): __________________________
Wetland Area (square feet): _____________________
Type of New Development Project: Residential Commercial
Limits of Disturbance (LOD) in acres:
(Land disturbance includes demolition, removal of pavements, and other activities that temporarily expose soil. It
does not include repaving or remodeling)
Proposed Impervious Area within the LOD (acres):
No. of Outfalls (pipe or open channel at the property line):
New Development v10.1.16 4
DETENTION REQUIREMENTS
Complete the applicable box below
Box 1
Detention basins are proposed to reduce the peak flows to baseline (pre-development) levels for the design
storms in Chapter 5 of the Stormwater Manual (1.6.3). In areas where downstream flooding is known to be
a problem, LFUCG may require that peak flows be less than pre-development (1.6.2).
Complete the Detention Basin Data Form for each basin.
Complete the Summary of Peak Flows for each outfall (pipe or open channel at the property line).
Article 16-2(g) of the Zoning Ordinance (check one box below):
Stormwater management facilities are provided for off-street parking areas containing five (5) or more parking
spaces and/or more than 1,800 square feet.
Off-street parking area is 1,800 square feet or less, or less than 5 parking spaces.
Box 2
On-site detention is not required (at least one box below must be checked, Section 1.6.2 of the Manual)
The Engineer has conducted a Downstream Study and all of the following apply within the study area:
there will be no increase in downstream water levels within the DSA for the design storms for flood
control structures in Table 5-1, and the 25yr-24hr storm
the downstream drainage system within the DSA has sufficient capacity as defined in Table 1-5
Note: The Downstream Study Area (DSA) means the area beginning at the property line and extending
downstream to a point equal to 10 times the area of the proposed limits of disturbance.
Detention is provided in existing facilities as part of a regional stormwater quantity master plan:
Expansion Area 2 Beaumont Centre Coldstream
Hamburg Reynolds Road Masterson Station
Other ______________________________________________________________________
Detention is provided offsite in existing facilities (explain in the Appendix).
Supporting documentation attached, including map of offsite detention basin.
New Development v10.1.16 5
DETENTION BASIN DATA FORM
Detention Basin No. __________ (Complete for each Basin)
Type of Detention Facility:
Detention Basin Underground Detention Wet Pond Extended Detention
Green Infrastructure w/detention volume: Infiltration Trench Bio-retention Bio-infiltration Swale
Permeable Pavement
Proposed Total Detention Volume: cubic feet (top of embankment to bottom of basin)
Peak Flow Attenuation Design
Design Storm
Peak Flows
Pre-Development
Basin Inflow
10yr-6hr
100yr-6hr
2006 actual storm
1995 actual storm
100yr-24hr storm:
Peak Stage __________________ (assuming no flow through the principal spillway)
Emergency Spillway Elevation _________________
Elevation of Normal Pool of Wet (Retention) Ponds _________________________
Wet Ponds are designed with anti-seep collars
New Development v10.1.16 6
SUMMARY OF PEAK FLOWS
Outfall No.
Peak Flow (cfs)
10yr-6hr
100yr-6hr
2006
1995
1
Pre-Development
Post Development
2
Pre-Development
Post Development
3
Pre-Development
Post Development
4
Pre-Development
Post Development
5
Pre-Development
Post Development
6
Pre-Development
Post Development
7
Pre-Development
Post Development
8
Pre-Development
Post Development
9
Pre-Development
Post Development
10
Pre-Development
Post Development
New Development v10.1.16 7
WATER QUALITY REQUIREMENTS
Complete the applicable box below
Box 1
Stormwater Controls (SWCs) are proposed to meet the water quality requirements (Section 1.7 of the
Stormwater Manual)
1. Compute the Required Water Quality Volume (WQV) and Runoff Reduction Volume (RRV) based on the
type of development:
Residential Subdivision with Lots 6,000 sf or larger:
Impervious Area (IA), not counting roofs, = _____________ sf
WQV = IA x 1.2”/12 = ______________________ cf
RRV = IA x 0.8”/12 = _______________________ cf (enter 0.0 if RRV is not feasible)
Commercial (and Residential Subdivision with lots less than 6000 sf)
Impervious Area (IA), including roofs = _____________ sf
WQV = IA x 1.2”/12 = ______________________ cf
RRV = IA x 0.8”/12 = ___________________cf (enter 0.0 if RRV is not feasible)
2. Complete the Water Quality Data Form for each outfall (pipe or open channel at the property line).
3. Provide SWCs to meet the Required WQV and RRV from above.
Check this box if Runoff Reduction is not feasible because all of the following conditions are present
the soil infiltration rate is less than 0.5 inches per hour (ASTM D3385)
o infiltration rate of the on-site soils = __________inches/hour
subdrains are not feasible for applicable Green Infrastructure practices
no other Green Infrastructure practices are feasible
Box 2
On-site SWCS are not required (at least one box below must be checked, Section 1.7.2 of the Stormwater
Manual)
Less than one acre of land will be disturbed.
Existing SWCs are in place as part of a regional stormwater quality master plan.
Expansion Area 2 (Facility No. _________) Coldstream
Other ___________________________________________________________
New Development v10.1.16 8
WATER QUALITY DATA FORM
Outfall No. ________ (Complete for each Outfall)
Required WQV from previous page = ____________ cubic feet (cf)
Required RRV from previous page = ______________cf
RRV Provided by Green Infrastructure
Description
RRV (cf)
Impervious Area Disconnection to Developed Green Space
Impervious Area Disconnection to Protected Natural Areas (including floodplains)
Bio-retention and Rain Gardens
Permeable Pavement
Bio-infiltration Swales
Infiltration Basins and Trenches
Groundcover for Vehicular Parking
Tree Trenches and Planter Boxes
Rainwater Harvesting
Vegetated Roofs
Riparian Buffer Restoration
Total
WQV Provided by Other Stormwater Controls
Description
WQV (cf)
Extended Detention Basins
Wet Ponds
Underground Detention
Wetlands
Total
WQV Provided by Manufactured Treatment Devices
Description
Impervious Drainage
Area (sf)
WQV
(Imp. Area x 1.2″/12)
Total
Summary Table of Stormwater Controls
RRV provided by Green Infrastructure (cf)
WQV Provided by Extended Detention, Wet Ponds,
Underground Detention, or Wetlands (cf)
WQV Provided by MTDs (cf)
Total (cf)
New Development v10.1.16 9
SUBMITTAL CHECKLIST
Engineer’s Drainage Report/Plans (Stormwater Manual Chapter 4 design documentation)
Watershed map with subwatersheds delineated and labeled (4.3.1)
Location map of the stormwater controls and outfalls (4.3.1)
Pre-development and post-development drainage map (4.3.1)
Streams, wetlands, and other environmentally sensitive areas are shown on the plan (4.3.1)
Detention basin design calculations and schematics (4.3.2)
Detention/retention basins are on a single lot (1.5.6)
Pre-Development and Post-Development runoff hydrographs with supporting data and analysis (4.3.2)
Hydraulic analysis of the proposed storm sewers, inlets, culverts, and channels (4.3.2, 1.6.5)
Water quality volume and BMP design calculations and schematics (4.3.2)
Detailed design of control structures and embankments (4.3.2)
Erosion prevention measures are provided at pipe outfalls (Section 1.7.6)
Channel protection measures are provided to prevent bank erosion (1.7.7)
Manufacturer’s design and maintenance standards for stormwater manufactured treatment devices (4.3.2)
If detention is not proposed, a hydraulic analysis is provided of the downstream drainage system that
demonstrates sufficient capacity (1.6.2)
Projects In or Along a Stream/Floodplain
LFUCG's FEMA Floodplain Administrator has reviewed the plans
FEMA Effective Special Flood Hazard Area is shown on the plan (1.5.12)
For areas w/o SFHA, an H&H study has established the BFEs for projects > 5 acres or > 50 lots (1.4.3)
Flood Protection Elevations are shown for structures (1.6.6)
Structures are at least 25 feet from the floodplain (1.6.7)
Plans conform to Table 1-3 regarding allowable uses in the floodplain (1.10)
Mitigation plans proposed for construction in the waters of Fayette County (1.5.5)
Vegetative buffers are shown on the plan (1.10)
Greenways are shown on the plan (4.3.1)
Federal, State, and Local Permits related to proposed construction in a stream or floodplain
LFUCG Division of Engineering Stormwater Permitting Checklist
USACE 404 Permit
KYDOW 401 Water Quality Certification
KY Stream Construction Permit
FEMA LOMR or CLOMR
Special Permit from LFUCG for construction in the floodplain
General
Adequate vehicle access provided to maintain BMPs (driving surface within 10 feet of the BMP)
Maintenance agreement for commercial projects
Appendix
Related drainage studies that affect the stormwater management plan of this project
Narrative of known downstream flooding problems from LFUCG studies or Engineer’s downstream study
Copies of Waivers or Variances from LFUCG
Note: If a box is not checked, provide explanation in the Appendix
New Development v10.1.16 10
List of Supplemental Information Provided in the Appendix
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LEXINGTON-FAYETTE URBAN COUNTY GOVERNMENT DIVISION OF ENGINEERING EXECUTIVE (Lexington-Fayette Urban County Government)

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Completed 3 August 2020

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