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<br />I <br /> <br />~egional RecreatioMl Plans. Sout~ Platte River oarkS and recreation <br />develo!)1lent plans. gravel mine operations and permits, and river corddor <br />development shall be fully coordinated with regional recreational plans of <br />the variou~ governmental entities, or groups of entities. <br /> <br />VI I 1~3 <br /> <br />Roughness. Hydraulic computations for the flow in the South PliltteRiver <br />channel should utilize the Mannino "n" roughness coefficients whiCh afe <br />based on US~CE dnd Wright Water Engineers calibrations shown in Table X~3. <br /> <br />Flood Hydrology. All planning and design for the South Platte River shall <br />be compatible and in accordance with the design floods given in the <br />Hydrology Chapter (r:l) of this report. <br /> <br />I <br />I <br /> <br />low Flood Hydrology. Avo;>raqe monthl y low flows in the South Pl atte R1ve~, <br />based on a dry year analysis must be considered fo~ nea~ term pl anning and <br />design purposes. <br /> <br />Criteria for Non-Structural Methods. The following measures maybe con- <br />sirlRred in managing flood damages by other than structu~al means. <br /> <br />I <br /> <br />,) <br /> <br />Floodproofing of commerci al and industrial st~uctu~es. (Considered <br />in both structu~al and non-structural methods.) <br /> <br />THIRD AVENlJE DIVERSlDN DI\M. <br />This structure provides an <br />example of a hydraulic con- <br />trol 'iIIlich required modifi- <br />cation. Byevaluatinggoa1s <br />and criteria similar to <br />those presented in this sec- <br />tion, the structure was mod- <br />ified by the incluSion of a <br />boat chute. This improve- <br />ment resulted in increased <br />imp~oved recreational access <br />without disrupting the od. <br />ginal futlctionof thedar.l. <br /> <br />b) <br /> <br />Early warning systems in conjunction with emergency plans. <br /> <br />c) <br /> <br />Flood insurance for flood orone properties. <br /> <br />d) <br /> <br />Reconstruction plans for land purchase and post-disaster plans. <br /> <br />e) Floodplain mimagemRnt p~ngri\11S prepared and adopted for the fre- <br />quent floods with appropriate conside~at ion of the potenti al for <br />la~ger floodS which are in exc~ss of lOO-year event. <br /> <br />Low Flow Hydrology. <br />based on a dry year <br />are listed below. <br /> <br />A~er age month 1 y low flows in the South Pl atte Ri ve~. <br />analysis. for near term pl a~ning d',d de~ ;g" ~urp()sl" <br /> <br /> <br />-, <br /> <br />-~~~ <br />,-~!IlC,.~ <br />;;.:,"~.;;:~: <br />",. <br /> <br />. <br />