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The increased runoff volume from development shall be calculated at 0.35 -acre feet <br />for each acre of impervious surface proposed in the development. Impervious <br />surface shall be all streets, parking lots, roofs, walks, driveways or other hard surface <br />materials proposed in any development. For residential developments, each lot shall <br />be assumed to contain 3,000 square feet of impervious surface for the house, garage <br />and driveway. Existing ponds or other facilities may be used for runoff volume <br />control. Any storage ponds shall be designed to retain the volume of runoff <br />calculated under this provision below its outlet or overflow point and above the <br />water table. <br />The Soil Conservation Service method of analysis shall be used to calculate the <br />runoff rate prior to development. The pre - development land use shall be considered <br />permanent meadow with a soil conservation curve number of 58. The 100 year, 24 <br />hour storm of 5.9 inches of precipitation shall serve as the basis of any such analysis. <br />Adopted by the Lake Elmo City Council this 6th day of March 2001. <br />Lee Hunt, Mayor <br />Attest: <br />Mary Kueffner, CiYy Administrator <br />