§ 23-6. Watershed management plan.

(a) In general.

(1) The Department may develop an overall watershed management plan for the purpose of implementing different policies for waivers and redevelopment.

(2) If the Department establishes a watershed management plan for a specific watershed, the Department may develop quantitative control waivers and redevelopment provisions that differ from § 23-1(a)(2)(ii) through (v) and § 23-7.

(3)(i) If the Department establishes a watershed management plan for a specific watershed, then the Department may develop separate policies, reviewed and approved by the State Water Management Administration, for providing water quality control.

(ii) These separate policies may include:

A. retrofitting;

B. stream restoration;

C. pollution trading;

D. design criteria based on watershed management plans developed under § 23-6(b) of this Division II;

E. payment of offset fees that are dedicated exclusively to provide for stormwater management within the same watershed as the proposed development; or

F. other policies developed by the Department.

(b) Requisites.

For this purpose, the watershed management plan must:

(1) include detailed hydrologic and hydraulic analyses to determine hydrograph timing;

(2) include an evaluation of both quantity and quality management and of opportunities for environmental site design implementation;

(3) include a cumulative impact assessment of current and proposed watershed development;

(4) identify existing flooding conditions and receiving stream channel conditions;

(5) be prepared at a reasonable scale;

(6) specify where on-site or off-site quantitative and qualitative controls are to be implemented;

(7) be consistent with the General Performance Standards for Stormwater Management in Maryland, found in Section 1.2 of the State's Design Manual; and

(8) be approved by the State Water Management Administration.