Agenda Packets - 2018/07/02 - Laserfiche WebLink

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(ii) Documentation demonstrating adequacy of soils, storage system, and delivery system; and (iii) Operations plan. (3) Approved capacity of an irrigation practice will be based on: (i) An irrigation rate of 0.5 inches per week over the irrigated pervious area(s) or the rate identified through the completion of the Metropolitan Council Stormwater Reuse Guide `Water Balance Tool Irrigation Constant Demand' Spreadsheet (whichever is less); or as approved by the District; and (ii) No greater than a 26 week (April 15th to October 15th) growing season. An additional water quality treatment capacity beyond 0.5 inches per week may be recognized under a subsection C.5(f) plan or a C.13 phased development permit based on a three-year average of monitoring records of volume irrigated. (4) Approved capacity of a non -irrigation practice shall be based on the rate identified through the completion of the Metropolitan Council Stormwater Reuse Guide `Water Balance Tool Non -Irrigation Constant Demand' spreadsheet, or as approved by the District. (c) Biofiltration/filtration BMPs must be designed to provide: (1) Adequate pretreatment measures to remove sediment before runoff enters the primary biofiltration area; (2) Drawdown within 48 -hours or 72 -hours from the end of a storm event, for surface or sub -surface features, respectively; (3) A minimum of 12 -inches of organic material or sand above the rock trench or draintile system; and (4) Drain tile system must be designed above the Seasonal High Water Table. 21