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<br />, <br />I <br /> <br />111-1 <br /> <br />! <br /> <br />SECTION!!! <br />HVDROLOGY <br /> <br /> TABLE 111-2 <br /> FLOOD CONTROL RESERVOIR$ <br /> Stofage(Acfl'.fef't) <br /> Permanent" Closure <br />Reservoir Total Pool Flood Control Surcharge Date <br />Chatfield 235,000 26,661 208,370 119,900 011/1973 <br />Cherry Cr. 93,920 13,960 79,960 134,470 IO/19Ml <br />Bear Creek 30,810 1,990 25,570 46,410 07/1971 <br /> <br />, <br />I <br />I <br />! <br /> <br />The opt imizatlon of the us!'s of the South 01 atte Ri~er corridor is closely <br />related to tnenydrologyoF the river and its floodplain area. A review of <br />the tabulation of uses shows that peak flood flows, average flows, low <br />flows, groundwater, water rights, return flow from lawn irrigation and <br />other non-point discharges, and sewage effluent areal1 hydrologicfactofs <br />whichaffectopti."al use of the South Platte River corridor. <br /> <br />TABLE llI-l <br />SOUTH PLATTE RIVER CO~RrDOR USES <br /> <br />*Peml~ne<lt poo 1 storage incl udes recre~t Jona llmul t i purpose pool s and sed I. <br />mentcontrolvolumes. <br /> <br />I <br /> <br />Flood control anddqinage <br />Domestic wate~ supply <br />T~~nspo~tation of ;r~igation water <br />T~ansportatinn and dilution of ~"w~e "ffl'.'f'nt <br />Cultural and recreation <br />Mineral resou~ce ext~action <br />Water exchanges <br />Ifldustrialwatersupply <br />WildlHe habitat <br /> <br />Drainage Basin <br />The South 01 atte River d~ainage basin consists of app~oximatel y 4,850 <br />square miles of land extending from the Continental Divide in the Rocky <br />Mount~in Range to the high pl ains and foothi 115 of eastern Colorado as <br />shown on Figure ! 11-1. The charaete~i sties and hydrologic impact of the <br />mnuntainous reg Ion and the high 01 dins and foothi 11 s region a~e quite <br />dHferent. The Mountainous we5te~n portions of the basin p~(lduce heavy <br />snov.\TIeltrunQffduringlatespri<lg. On the other hand, the high plains and <br />footh i 11 s po~t ions of the h~s i n ,lr€' more susr..ptib 1.. to high runOff dur i ng <br />s'Jmme~ t~unde~storms. <br /> <br />Flnod Cnnt~ol Storage <br />The South ?latte River flood potential js mitigated by Chatfield, Cherry <br />Creek and Bear C~e..k flood CQnt~ol ~eservoirs. The locat ion of t~ese <br />~ese~voirs is shown on Figure 111-1. Tributaries e-nter thl' main~t~'~ of thl' <br />South Platte River downst~e~n of the~e ~e5e~voirs which increases the ~lood <br />patent i al below the reservoirs. Flood cont~ol sto~age avai 1 able in these <br />reservol~s is shown in Table 111-2. <br /> <br />The I~etropo 1 itan De~ye~ area is heav i1 y de-vel oped ~nd out 1 ying areas are <br />spd~sely develop..d. Thr lTI['}unt~inOlls areas a~e gene~a11y unsuited fo~ dense <br />development ~nd will probably remJi~ ~parsely developed. The foot~il1 and <br />high plains urea~ are rna~e 1 ikely to develop but not to the extent of the <br />ex 1st ing met~opol itan a~ea. Ex ist In9 development in t~e metropol itan ared <br />consi5ts prima~ily of reside~tial and comme~cial a~edS '~ith ,ninimal indU5_ <br />trlalreg;ons. <br /> <br />Peak FlOw; <br />A majo~ity of the orecioit~tion ,,~ich t~ll~ Mer the South Platte Rive~ <br />!Jasin consists of snowfall in the 'llountainou5 region and thundersto~m <br />