Laserfiche WebLink
<br />Flood Freq~ency. (See Probability) The average recurrence interval of <br /> <br />THE STUDY AREA <br /> <br />apecific discharges or water atages ~hich ceuse flooding. <br /> <br />Sand Creek, its tributary Toll Gete Creek, snd Cherry Creek drain <br /> <br />Flood Proofing. A combination of atr~cturel changes and adJu8t~nts to <br /> <br />adjacent ~atersheds in the high plains region of Colorado. The r~noff <br /> <br />properties s~bjeet to flooding, primarily for the reduction or eli~in8' <br /> <br />from these watersheds converges on metropolitan Denver. The lower reaches <br /> <br />tiOD of flood damages. <br /> <br />of these streams paBS thro~gh the ~rbaD sreaa of Denver, Aurora, and <br />Commerce Town, Colorado, before the stresms disel1Jlrge into the South Platte <br />River in the northern cnvirons of Denver. Totel stream lengths and the <br /> <br />Maximum PrObable Flood. A potential flood with the highest discharges <br /> <br />aod runoff volume to be expected from the most critical combination of <br /> <br />meteorologic and hydrologic conditions ressonably capeble of occurrence <br /> <br />lengths of study reaches in the metropolitan ares are tsbulsted below: <br /> <br />in the region. <br /> <br /> Total Metropolitsn Reach <br /> StrealllLeru,-;th, Stream Lengtb, <br />Stream Miles Miles <br />So", Creek 38 13.1 <br />Toll Gate Creek 15 6.8 <br />Cherry Creek 65 11.7(1) <br /> <br />Probability. The annual chance of Occurrence of specific hydrologic <br /> <br />events, s~ch as rainfall Over a apecified area or,peak discharge st a <br />specified locstion expressed in percent, e.g., 5i representing one chance <br /> <br />in 20 of the event occurring in any year.or an averege recurrence of <br /> <br />once in tventy years. <br /> <br />Standard ProJect Flood. A hypotheticel flood, estimated by the Corps of <br /> <br />(1) Above the stlldy re"ch, the strealll is controlled by Cherry Creek Darn. <br />The combined drainage area of the SIlnd and Toll Gste Creek watersheds <br /> <br />Engineers, representing the critic.l runoff vol~ e~ peek diacharge <br /> <br />is 191 square lllilea, of vhich 42 square ~iles are drained by TOll Gste <br /> <br />which ~~y be expected fr~ the most severe combination of meteorologic <br /> <br />Creek. ^bo~t 3C zq~sre =ilc3 of t~e ~~bined drainage are" a~e eurrently <br /> <br />and hydrologic conditions considered to be reaaonably chsrecteri8tic of <br /> <br />~rbanized. <br /> <br />the geographic region involved, excluding extremely rare combinations. <br />Standllrd PrOject Flood M8gnittldea uBuelly rsru,-;e from "-0 to 60 percent of <br /> <br />The drainage aree of the Cherry Creek watershed is 409 square miles. <br />CherryCreekDeIDendReeervoircontro1arunofffromthc\i\lper3858quare <br /> <br />MeximlJJl> Probable Flood eetiDletea. <br /> <br />miles. The uncootrolleddrainage area frolllthe dal1l to the Olouthof <br /> <br />Cherry Creek 1s 24 sq~re llliles, of ~hich 7.8 sq~rc l1lilcz arc drni~d <br /> <br />by Goldsmith GulCh. About 25 percent of the Lower Cberry Creek watershed <br /> <br />is highly =b"nized. <br /> <br />2 <br /> <br />J <br />