FLOOD10068 - Laserfiche WebLink

Home Browse Search

FLOODS hBve undoubtedly occu~~ed ~lon9 the st~eams cove~ed in t~is ~epo~t, bUT t~e events have not boon recorded - p~ob<'lbly beclluse t~e 1 loads we~e I>Ot I>Ot iced prlo~ to the ~ecent urb~ni ZlItlon. GENERAL CONDITIONS . . . ThiS section described the gener~1 characte~istics of the strea~s with emphasis on the reaches coye~ed in this ~epo~t. FLOOD DAMAGES would occur to some extent On all the st~ea~s in t~is repo~t. r,old~it~ GUlCh would cause the most extensive da~ges due to t~e ~ore advanced urbani zat ion a long Its banKS. Oa""'ges would result from ~sement and ground floo~ tlooding, erosion to streets and yards, and the depositIon of silt(lnd debris.' GOLDSMITH GULCH - GROUP I . . . Stream and Valley Characteristics Goldsmith Gulch drains 7.80 square mi les in southeast Denver and adjacent Arapahoe County. Itflowsnortherly,parallal to Cherry Creek, between Cha~ry Creek and Interstate Highway 25, Goldsmith Gu Ich extends f~O'11 Its headwaters about 3 miles southwest of ChElr~y CreElk Dam and Lake to its junction wIth Cherry Creek about 4miles downstream frOl1ltheCherry Creek Dam. ThedrainagabasTn Is7mileslongandaverageJustover ImllewldEl. Most of the land In the downstream one-half 01 the basin has ~en urbanized ~nd development of the rem~lnder of the basin Is proceeding at a rapid pace. DURATION OF FLOODING Is b~lef due to the small a~eas drained and the rapId runoff from relatl~ely steep slopes. . . . HAZARDOUS CONDITIONS would occur during flooding ~cause of high velocities, rapidly rising streams, and deep overbank flows. Veloc- ItIes over 3 teet per second COMbined wIth 2 feet or more of dept~ aregenerallyconslderedhaZardo\ls. These conditions would occur during large tloodson the streams studied for this rGflQrt. . . . The study reach extends 7.5mlles trom the rnouth at Chilr~y Creek to a poi ot about 1,000 feet upstream of Dayton Street. Most of the first 2 mTleS of the channel upstream f~om the ~outh . '"" -< "'k_. "',r~tlon.. I nC IUOll relocation ~nd straiqht- ~~ve ueen a ,e~eu. '''~ u v . enlng. The channel iSlinedwithconcrEltel.>"tw""nth..tenniscourts which are located opposite the intersection of Colorado Orlve with South Mon~co Street. The channel Is conf i ned to a !, 730 foot long underg~ound concrete conduit downstream of IlIff Avenue. Upstream fromHlghlandCaoalthechannAI Is in Its natural stato oxcept for a straightened portion between H3~pdeo and Quincy A~en\les. The Mtural channel Is small, sinuous, and freo of trees. The flood plaIn is narrow in the uppe~ reaches and widens slightly as it merges with the Cherrv Creek flood plain. Table 2 lists the lleMr" I physi- cal features of Goldsmith Gulch. The charaCTer ot the stro"", Is alSO shown by photographs Included in this report. FLOOD CONTROL AND DEFENSE Is largei y nonexistent On Dutch CreeK ~nd its branches. T~e channel of r,oldsmlth r~lch has been straiqhtened and Anlargod to sC<TJe extenT, but not sufficiently to contain larqe floods. , ,