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<br />retard flow and raise w::lter surface olevatlons upstrean. HIgh cliff <br />ty~e b,mks that line much of the stream arc rough ond varyIng In <br />cross soction t~at generate turbulence in the water and slows Its <br />prognlS5. <br /> <br />The north tributary to Cottorwood Crook hils no bridges <br />or man made obstructions to Impede flow, but the south tributary h(ls <br />4 culverts thatobstrllCt flow. Table 2 isa listing of all bridges <br />oreulverts that cross Cottonwood Creek and its tributaries. <br /> <br /> ~ <br /> " <br /> e <br /> " <br /> B <br /> ~ <br /> " <br /> 0 <br /> , <br /> ~ <br /> " <br /> " <br /> < <br /> 5 <br /> m <br /> " <br /> e <br /> 0 <br /> . <br /> < <br /> " <br /> " <br />I " <br />N " <br />W 0 <br />" 8 <br />I " <br />< ~ <br />e <br />I e <br /> e <br />I 8 <br /> ~ <br />, ~ <br />, ~ <br />I u <br /> < <br />I ~ <br /> I< <br /> w <br /> > <br /> " <br /> 0 <br /> u <br /> p <br /> z <br /> < <br /> ~ <br /> ." <br /> 8 <br /> " <br /> 0 <br /> <br />Other Factors AffecTin"l Floodin"l <br />TwO small reservoIrs are loeated In the upstre1lm roaches <br />of Q:lttonwood Creek. These reservoirs are beneflcl111 in increasing <br />I nflltratlon rates and reducing pe",k runoff froo floods of small <br />ITklgnltude. Large floods are relatively unaffected by ttle small <br />storage eapacl tv, and because of I nildequate earthen d3m!; ~nd spIll H <br />ways, they could Impose greater hazard on properties downstream. <br /> <br />Flood Dilmaqe PrevenTI on I~""sures <br />Several flood damage prevention me<lsureS hl,lve been taken, <br />by local Interest, tor the reach of Cottonwood Creek from Academy <br />Boulevard ei:lsTw-,rd for ~pproximately or\€ mi I". A sheet pile retaTn- <br />ing wall h::ls been oonstruc"tea across the creek above Academy 8oulo- <br />vard to prevent erosIve degrdd~tlon of the stream. Also along the <br />northernsldaofthestreom,leeveesof local sand and gravel mote- <br />rial h~ve boen con~Tructcd TO protect a~Jecent reslduntlai ~r~~~. <br /> <br />Theleveefrommlle 1.70 to mile 2.08 has been partly stabilized <br />with sparse gra5ses, but the levee frommJle 2.27 to mIle 2.46 has <br />bee.~ recently constructed and has no stabi I I zin,) material to pro- <br />tect it from erOSion. <br />Both the need for und means of preservl ng f loodway Idnd~ <br />ani! recel vl ng cons; der1ltion 1 n tile coordi nated land ~se pl::lnni ng <br />that presently Involves the Pikes Poak Area Oouncll of Governments <br />{PPACOG) ~nd its portlclpatlng local government entities in EI Paso <br />Ccwn+y. 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