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<br />Tallie I (Continued) <br /> <br />SUMMARY OF FLOOD SITUATION <br /> <br />Volume <br /> <br />Stream <br /> <br />Date Pu~ I i~hed <br /> <br />" <br /> <br />Biq Dry Creek <br />Little8ryCreok(ArapahoeCo.) <br />Greenwood Gulch <br />'iieirGulch <br />LakowoodGulch <br />Scuth Lakewood GulCh <br />Mclntynl Gulch <br />Little Dry Creek (Adams Co.) <br />GrangelfullCreek <br /> <br />October 1968 <br /> <br />The South Platte River flows north through Metropolitan <br />Denller acoot 12 ",iles east ot tile Rocky Mountain fronf range. Two <br />major tributaries, Clear Creek dnd Bear Creek, prolllde drainage for <br />the sloping terrace between the continental divide a~ the South <br />Platte Riller. Numerou~ small tributaries feed into the two major <br />tributaries or directly Into the South Platte Riller. Thlsreport <br />presents the flood characterlstlc~ of five of the ~ller tributaries. <br />Leyden and Van Sibber Creeks flow Into Ralston Creek wnich in turn <br />flows Into Clear Creek near W. 56th Ave. and Sheridan 8lvd. The~o <br />three streams drain a portion 01 tho mountains and plains areaS north <br />01 Clear Creek, Lena GulCh drdlns a portion of the mountains and <br />plains area south of Clear Creek. LenaGulchentersClearCroeknear <br />KiplIng at '0'/. 41st Ave. Sanderson Gulch parallelsW. Jewel Ave. <br />draining a small portion of the hlghpl<llns north of Bear Creek. <br />Sanderson GulCh flows directly Into the South Platte Riller. <br />The f ille strs<lms havc a number 01 ~lmllar characteristics. <br />They are steep, flow in an easterly diroction, pass through an exr>an d- <br />Ing urban area, and are subject to flash-type floods. Tho character~ <br />istlcsofth€'tlllestreamsarecMdnglr>gduetourbdnlzati'ltl. At_ny <br />locations the Channols have been relocated, stralghtened,orenlarged <br />prollldlng locreasedcapilclty. Unfortunately, thechanool improvo- <br />ments are often nullified by constrictions through bridges or under- <br />ground conduits. The 1 lows for a given frequency of f loading wi II <br />Increase 115 the} drainage basins ars developed. Paved surfaces and <br />t>uildlngsprcllentinfiltratlon. Streetguttersandsrormsewers <br />speed the runoff to the str~ms. Channels Which are now adequdte <br />will be overtopped when increased runoff 15 produced by urbanization <br />of the upper drainage basins. S"wlr"" factors "b~urA the flood <br />threat to these stroams. Largefloodsare;nfrequentandconsider- <br />able deveiopment Can occur in a flood plain ~I bel ore a flood Droblem <br />Isknowntooxist. Secondly,llIIlstonCreo""leydanCreek,Lena <br /> <br />ThellbovevoluMeswerodistributedatthetlmeofpubll_ <br />cation by tho Oonver Regional Councll of Governments, the Colorado <br />Water Conservation Board dnd the ~ha DIstrict, Army Corps of <br />Engineers. Reference copies are availabledt those agencies. <br /> <br />III <br /> <br />'I <br />See Glos~ry of Torms <br /> <br />I <br />