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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 21. WATER AND SANITATION |
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Chapter 21-5. WATER QUALITY AND POLLUTION |
Section 21-525. STORMWATER MANAGEMENT: SHARED BEST MANAGEMENT PRACTICE
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525.1A Shared Best Management Practice (S-BMP) may, upon approval by the Department:
(a) Provide stormwater management for a major regulated project in satisfaction of an on-site stormwater management requirement of that project; and
(b) Be eligible for Department certification of a Stormwater Retention Credit (SRC).
525.2A Department-approved S-BMP may provide stormwater management for a nearby property if:
(a) Stormwater flow from the nearby property is directly conveyed to the S-BMP; and
(b) The S-BMP has sufficient capacity.
525.3To obtain Department approval of the use of an existing S-BMP, a major regulated project shall show how each requirement of the project will be met by the S-BMP, including:
(a) Submit an as-built Stormwater Management Plan (SWMP) for the S-BMP that is accurate as of the time of submittal;
(b) Prove sufficient capacity of the S-BMP;
(c) Demonstrate the adequacy of each stormwater conveyance from the major regulated project to the S-BMP; and
(d) Show each drainage area conveying stormwater into the S-BMP from the major regulated project.
525.4 To obtain Department approval of the use of a proposed S-BMP, a major regulated project shall show how each requirement of the project will be met by the S-BMP, including:
(a) Submit a Department-approved SWMP for the S-BMP;
(b) Prove sufficient capacity of the S-BMP;
(c) Demonstrate the adequacy of each stormwater conveyance from the major regulated project to the S-BMP; and
(d) Show each drainage area conveying stormwater into the S-BMP from the major regulated project.
525.5A major regulated project that uses a S-BMP to meet a requirement shall not pass the Department’s final inspection until the S-BMP passes the Department’s final inspection and is operational.
525.6After an alteration to a S-BMP to provide stormwater management for another site, the site with the S-BMP shall:
(a) Pass the Department’s inspection; and
(b) Submit an as-built SWMP, showing each area draining into the S-BMP and the means of conveyance.
525.7The Department may certify a SRC for a S-BMP if the S-BMP meets each requirement for certification.
525.8A site with a S-BMP that provides a volume of stormwater management to satisfy an on-site requirement of a major regulated project shall be responsible for maintenance of the S-BMP capacity to manage that volume and shall record that responsibility in a declaration of covenants.
525.9If the Department determines that a S-BMP has ceased satisfying an on-site retention requirement for a site that underwent a major regulated project, the site shall be responsible for retaining the required volume on site or via use of off-site retention.