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overbank flow is >~uced during the 100-y-ar ~od and <br />that any erosion will be contained on the property. The <br />slope of the lake's southern bank should be maintained as <br />flat as possible to help control erosion; planting with <br />suitable ground cover is reco,iunended. <br />Existing dikes including the dike along the southern <br />boundary and along the west bank of the South Platte River <br />must be maintained ~t their present levels to avoid any <br />change in flood levels,oi in the channel-overbank flood relation. <br />If the dikes were to be constructed higher, channel flood <br />levels and velocities would increase. If the dikes were <br />lowered, more overbank flooding would occur. <br />If ore continuous lake surface is maintained south of <br />Henderson Road, it is recommended that peninsulas which <br />extend into the lake be constructed at a maximum height of <br />3 feet (elevation approximate, ~0 feet) above the lake's <br />'timate surface. This ~:~ill heli, control erosion during <br />foods. More than one lake level can be maintained if <br />pe~linsulas are extended to connect with the opposite side. <br />In this case, peninsulas can be constructed higher, but <br />care she 3 be taken to design them to withstand overtopping <br />and erosion during flooding. <br />Excavation of the north area is not expected ~~ alter <br />eft. - the flocd plain or floodway limit. The slope of the <br />southwest bank of the north lake should be maintained as <br />flat as possible to minimize erosion; planting with vege- <br />tation is considered 3esirable. <br />No buildings for permanent occupation should b~ alloweu <br />within the flood plain limits. Temporary huildings and other <br />structures should be aligned so th~.t their longitudinal <br />axes are parellel to the direction of flow, roughly northeast. <br />'fire flood plair. regulatio;z.; oL- Adams County should be followed. <br />Planting of trees during reclamation should ~ donr in a <br />manner which iea~t obstructs the flow, along the east and <br />west banks. Dense planting of trees should not be allowed <br />on the ~~eninsulas although isolated plantings can be <br />tolerated without seriously aflecting flooding characteristics. <br />Site Drainage <br />During mining and reclamation, areas south of ienderson <br />Road will begi,r to drain to the lake formed by the exca- <br />vation. As excavatior. ~n this area nears Henderson Road, <br />an overflow device shoul3 be constructed which will ,l low <br />the lake to overflow to the existing culvert under lenderson <br />Road. :dorth of Henderson Road, some excavation and cleanout <br />may be required to ensure that the swale extenc.~ng from the <br />culvert to Bran~...:r Gulch drains adequately. No overflow <br />Structure is necessary for the northern lake. <br />Ti7c' t•:~o existing 1~ ter,,l frcm Brantner Ditch which <br />sc rvc the' aro.~ sea .h of Ile ndrrs~n Roars will be maintained. <br />-30- <br />