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ORDINANCE NO. 8020 CITY OF LAKE ELMO WASHINGTON COUNTY, MINNESOTA AN ORDINANCE AMENDING SECTIONS 401.220 AND 401.240 OF THE 1979 LAKE ELMO MUNICIPAL CODE, RELATING TO SUBDIVISION AND PLATTING OF PROPERTIES, BY ADDING TO PARAGRAPH B3c OF SECTION 401.220 AND BY ADDING TO PARAGRAPH B3k OF SECTION 401.240, RELATING TO STORMWATER RUNOFF CONTROL The City Council of the City of Lake Elmo hereby ordains: SECTION 1. Amendment. Section 401.220B.3.c. of the 1979 Municipal Code of Lake Elmo, adopted October 16, 1979, is hereby amended to read as follows: B.3.c. Provision for surface water disposal, drainage, and flood control within the boundaries of the proposed property division. The rate and volume of surface volume runoff within the boundaries of a proposed property subdivision shall not, in any event, be greater than the rate and volume of runoff existing on the proposed property division prior to the proposed development. Surface volume runoff is water leaving the property on or very near the surface. To the extent possible, provisions shall be made for controlling runoff by construction or enhancement of ponding facilities on the site of and within the boundaries of the proposed property division, which ponding facilities should provide for both permanent and temporary storage of runoff waters. The increased runoff volume from new development shall be calculated at 0.35 acre-feet for each acre of impervious surface proposed in the development. Impervious surface shall be all streets, parking lots, roofs, walks, driveways or other hard surface materials proposed in any development. For residential developments, each lot shall be assumed to contain 3,000 square feet of impervious surface for the house, garage and driveway. Existing ponds or other facilities may be used for runoff volume control. Any storage ponds shall be designed to retain the volume of runoff calculated under this provision below its outlet or overflow point and above the water table. The Soil Conservation Service method of analysis shall be used to calculate the runoff rate prior to development. The predevelopment land use shall be considered permanent meadow with a soil conservation curve number of 58. The 100 year, 24 hour storm of 5.9 inches of precipitation shall serve as the basis of any such analysis. This ordinance shall apply to all areas of the City exclusive of that portion of the City within the Ramsey -Washington Metro Watershed District.