06-28-1976 Council Meeting Minutes

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� � CSRONO COUNCIL MEETING HELD JUNE 28, � �76 Page 8 � Grading limits to the west of the proposed store SUPER VALU STORE � have been brought closer to the building with 3333 Shoreline Drive the result being that an area of roughly 35 feet (Continued) � east of the Relly Avenue property line is being left in its natural state, P,s presently � designed, this natural area ��ould receive the runoff from the westerly portion of the parking • area, The plan as submitted does not call for � any erosion control measures being taken in this natural area to minimize disruption �ue � to increased runoff. The Planning Commission has recommended the elimination of the bituminous � spillway which had been earlier proposed through this areao [rIe would recommend the approval of • the drainage from the parking lot as shown on • plan dated June 6, 1976 , but with the stipulation that any future erosion problems shoulc� be � corrected and if necessary a spillway be constructedo In our letter of June l, we had recommended that � due to the increased runoff from the narking areas of the site, a provision be made for • storage of storm water on the building itself with removal of this �aater occurring normally � through evaporationo This recommendation � would stand unless storm water from the roof of the building is diverted to the County Road 19 - � County Road 15 storm sewer which seems to be practical, t�Jith diversion of roof drainage � to the storm sewer together with the drainage from the northeast portion of the site, the net • effect of this facility would be summarized as � followso � Presently approximately 2,6 acres of the site drain to the Kelly Avenue areas. Under the � present plan, this hreak in drainage woul.d be retained and the roof drain carrying the • storm water to County Roads 19 and 15 would effectively reduce the Kelly Avenue drainage area � by approximately 0.37 acres, This decrease in � the overall Iielly Avenue drainage area would be offset by any increased amount of runoff due to � the hard cover in the parking area> The net increase in runoff to the Kelly Avenue drainage area � vaould be approximately 20 percent (from this site) varying with the duration of the rainfall and the • saturation of the soilo The overall increase in + runoff to the low lying Kelly Avenue area would be negligible, hocaever, when compared to the S overall drainage area of approximately 37 acres along the east side of Kelly Avenuee ��Ie would � estimate the net increase in runoff to be one � to two percent. We would caution the City, however, that any increase in runoff from any �ortion of the drainage area �vill only serve to worsen � the periodic problems within the drainage area, (Continued) • �