01f_NCS000250_Toolbox_AuditPresentation_2019-9-23_BSL

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NCDOT's
BMP Toolbox for Post -Construction Runoff
September 23, 2019
Brian Lipscomb, PE

9
Highway Stormwater Program
Co -managed by the Hydraulics Unit and the Roadside Environmental Unit
Comply with the NPDES Permit (NCS000250)
4t" Term (10/1/2015 - 9/30/2020)
• NPDES Permit Sections, Part II
Section A - IDDEP
Section B - Post -Construction Controls
— B.1 — SSIPP
— B.2 - BMP Retrofits
— B.3 — BMP Toolbox
— B.4 - BMP I&M Program
— B.5 — PCSP
— B.6 — Vegetation Management
Section C - Construction
Section D - Industrial Facilities
Section E - Education and Involvement
— E.1 —Internal
— E.2 — External
Section F — Research and Program Assessment
NORTH CAROLINA
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3. BMP Toolbox for Post -Construction Stormwater Program
a. Objectives
i. Maintain and update as necessary a BMP Toolbox to aid in the siting,
design, and construction of Stormwater quality BMPs with guidance on the
suitability of each for NCDOT applications.
ii. Evaluate BMPs for applicability to a linear highway system.
b. Management Measures
The NCDOT shall implement the following management measures to meet the objectives
of the BMP Toolbox for Post -Construction Stormwater Program (PCSP).
Vie; -Management Measures
Measurable Goals
(a) Maintain a BMP
Maintain a stormwater BMP Toolbox to provide design guidance
Toolbox.
for post -construction stormwater control measures. The BMP
Toolbox will include appropriate uses/anticipated applications and
design criteria. Proprietary BMPs will be evaluated in keeping with
DEMLR requirements for permitting new stormwater technologies.
(b) Update the toolbox as
As necessary, evaluate new BMP types or design components for
necessary
potential updates to the BMP Toolbox. If applicable to NCDOT
applications, the BMP Toolbox will be updated to include this new
information.
(c) Submit proposed
New guidance on proposed BMPs will be submitted for DEMLR
BMP Toolbox
approval prior to implementation.
revisions to DEMLR
for approval.
3

Post -Construction Stormwater Guidance
NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
GUIDELINES FOR
DRAINAGE STUDIES
AND
HYDRAULIC DESIGN
DAVID S. CHANG, PhD., P.H.
STATF HYDRAUR.TCS TNGE4FER
NGVEhiR 21, 2016
H
Istormwater Management Plan
NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
STORMWATER BEST MANAGEMENT PRACTICES TOOLBOX
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Where Find the BMP Toolbox
Connect NCDOT
connect.ncdot.gov
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https://connect.ncdot.gov/resources/hydro/Pages/HSPProgramPages.aspx?PGM=BMPT
Or
Google
NCDOT BMP Toolbox

Toolbox Chapters
• Chapter 1 —Introduction
• Chapter 2 —
NCDOT Stormwater BMPs
• Chapter 3 -
Level Spreader
• Chapter —
Preformed Scour Hole
• Chapter 5 —
Dry Detention Basin
• Chapter -
Swale
• Chapter 7 -
Forebay
• Chapter 8 -
Hazardous Spill Basin
• Chapter 9 —
Bridge BMPs
• Chapter 10
— Infiltration Basin
• Chapter 11
— Media Filters
• Chapter 12
— Wet Detention Basin
• Chapter 13
— Stormwater Wetland
• Chapter 14
— Filter Strip
• Appendices
6

Potential Toolbox Chapters
• Permeable Pavement
• Bio-Embankment
• Bio-Filtration Conveyance
• Bio-Swale
• Living Shoreline
• Open Graded Friction Course
• Soil Amendments
• Disconnected Impervious Surface

Documentation
Stormwater BMP Toolbox
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Considerations
• More web -based
— Chapter by Chapter downloads
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Stormwater Design Manual
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Part C: Minimum Design Criteria and Recommendations for Stormwater Control Measures
G0. MDC for all SCMs _ (1/312017)
C-1. Infiltration System_ (61312019)
G2. Bioretention Cell_ (111912018)
C-3. Wet Pond_ (711812019)
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Other Tools / Resources
Field Guide For Post -Construction Stormwater BMPs
https://connect.ncdot.gov/resources/hydro/Pages/HSPProductPages.aspx?PROD=FGPCS
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FIEL❑ GUIDE FOR
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STORMWATER
BEST MANAGEMENT
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WET DETENTION BASIN
A Wet Detention Basin is a basin or pond that is
designed to maintain a permanent pod of water.
reduce stormwater runoff, promote sedimentation of
dill and debris, and reduce velocity of flow
downstream.
Wet Detention Basins are generally comprised of.
✓ Foreraay, - Dissipates energy and captures
sediment from inflow See Section 6.
J Basin - Impoundment area for storage or
runoff.
✓ Vegetated Shelf - Perimeter of the basin
planted with wetland vegetation.
Outlet Control Structure - Concrete box with
drawdown device and trash rack
Drowdown Device - Set at the permanent pool
elevation for controlled release of now.
Embankment - Earthen berm used to form
basin.
✓ Emergency Spillway - Releases large storm
events to prevent embankment overtopping and
erosion.
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NCDOT
Questions
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tormwat
PROGRAM
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