Minimum Design Criteria: Shaping the Future of Stormwater Management
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1 Minimum Design Criteria: Shaping the Future of Stormwater Management Annette Lucas, PE (919) NC Division of Energy, Mineral and Land Resources Stormwater Program
2 Minimum Design Criteria: Shaping the Future of Stormwater Management What is an MDC and who decides? Preview of the MDC How MDC will affect stormwater management.
3 What are MDC and who decides? MDC Team: Created under S.L , requires DENR to convene stakeholders to: 1. Develop MDC that encompass all requirements for BMPs. Deadline: Feb. 1, Develop a fast-track permitting process no technical review when all BMPs comply with all MDC & the permit application is prepared by a qualified individual. Deadline: July 1, 2016.
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5 MDC are design standards that are needed to insure that a BMP:
6 Ex. Infiltration systems shall be 5 feet from building foundations. Function in perpetuity Remove TSS Protect WQ standards
7 MDC apply to all BMPs regardless of: Geographical location, stormwater program or fast-track or regular review process.
8 Nutrient Design Criteria Design criteria that increase the Total Nitrogen (TN) and Total Phosphorus (TP) pollutant removal rates
9 Temperature Design Recommendation Voluntary design recommendations to optimize the device s effectiveness in reducing SW temperature.
10 Preview of the MDC.
11 MDC Team has met since March 2014: BMPs in general Wet ponds Infiltration systems
12 General MDC Recorded drainage easement. Dewatering device. No erosion at BMP inlets or outlets. Operation & maintenance agreement. Vegetated slopes no steeper than 3:1 Designer certification. Water quality volume calculation.
13 Which one of these is STILL a wet pond MDC? a. The permanent pool must be within 6 of the SHWT or a liner shall be installed. b. The SHWT must be determined for every pond. c. The vegetated shelf must be 10 feet wide. d. The forebay must be 20% of the total volume. e. There must be a level spreader and filter strip at the outlet.
14 The permanent pool must be within 6 of the SHWT or a liner shall be installed.
15 The SHWT must be determined for every wet pond. Only if the wet pond is within 50 feet of a wetland
16 The vegetated shelf must be 10 feet wide.
17 The forebay must be approximately 20% of the total volume of the pond. Forebay 20% Permanent pool volume 6-ft Vegetated Shelf Vegetated Side Slope Outlet Structure
18 There must be a level spreader at the outlet.
19 Updated design premise: wet pond New option: Hydraulic Retention Time (HRT) method Permanent Pool Volume, V pp : V pp = HRT T dd HRT * WQV Where: V pp = Permanent pool volume (cu ft) T dd = Drawdown time (days) HRT = 14 days (hydraulic residence time) WQV = Water quality volume (cu ft)
20 Which one of these is STILL an infiltration MDC? a. Only the design storm may be conveyed to an infiltration system. b. Pre-treatment must be provided. c. The maximum drainage area for an inlet to an infiltration system is 2 acre-inches. d. A 4-inch layer of washed sand shall be provided at the bottom of the infiltration system.
21 Only the design storm may be conveyed to an infiltration system.
22 Pre-treatment must be provided.
23 The maximum drainage area for an inlet to an infiltration system is 2 acre-inches.
24 A 4-inch layer of washed sand shall be provided at the bottom of the infiltration system.
25 Updated design premise: infiltration system Infiltration systems shall dewater to the bottom of the infiltration device within 72 hours. A site-specific soil investigation to establish the infiltration rate.
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28 How MDC will affect stormwater management.
29 MDC will result in updates to: Stormwater rule (15A NCAC 2H.1000) BMP Manual
30 WHY do we need to update the Stormwater Rule?
31 BMPs in 1995: Wet pond Infiltration system Swale BMPs in 2014: Wet pond Infiltration system Swale Bioretention SW wetland Sand filter Level spreader Disconnected imp surface Permeable pavement Rainwater harvesting Green roof Proprietary systems
32 BMP Manual will be technical guidance, providing advice for designers on how to meet the MDC.
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34 Minimum Design Criteria: Shaping the Future of Stormwater Management Annette Lucas, PE (919) NC Division of Energy, Mineral and Land Resources Stormwater Program
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