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• <br />additional protection ie to ba provided for the Brantner Ditch, an <br />overflow structure should be provided at concentration point CA_l• <br />At the time that a rehabilitation plan be adopted that may incrasae <br />the runoff at point CA_l, a more detailed report should be provided <br />to detsrmin• th• protection structures required. It is recommended. <br />that as much water as possible from the site be directed through <br />aonosntration point CA_1 ^inca this point lies within the main natural <br />drainage channel which i• the most convenient route, South of Todd <br />Creek, for directing storm water to the Platte River Flood Plnin. <br />After passing under the Brantner Ditch, the storm water follows <br />the natural drain to th• Riverdale Road and into a 30 inch C.M:;P. <br />culvert under Riverdale Road. The 30 inch C.!l.P. is inadequate to <br />carry the runoff and there is evidence o! recent over-topping of the <br />roadway. The slops is very flat in this area and there are no ^igns <br />of erosion of th• road bed. <br />The flow then proceeds Baaterly over the flat flood plain into <br />the South Platte River. <br />Upon excavation of the wet pit, East of the Riverdale Road, the <br />storm water will be directed into the pit to bs dissipated into the <br />Platte btivar gravels. The runoff water dar~ctsd into the pit or lake <br />will replace evaporation resulting from the lake .construction. <br />Th• area of lnnd contributing to the runoff into the lake is <br />approximately 330 acres. The aren of the proposed lake is approximately <br />80 acres. A raialall producing a runoff of 1 inch would raise the <br />water level (~3e 1 only 4 inches if no Infiltration ie considered. <br />- 4 - <br />