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ROCKY MOUNTAIN CONSULTANTS, INC. <br />500 COFFMAN STREET. SUITE 10T, LONGMONT. COLORADO 60501 <br />7T2~5282 or 665-6283 (METRO) <br />October 19, 1982 <br />REVIEW OF THE FLOOD POTENTIAL FOR <br />WESTERN PAYING'S COTTONWOOD FARM PROJECT <br />IN WELD COUNTY, COLORADO <br />Introduct•fon: <br />This report is prepared as a review of the intermediate flood (100-year), the <br />standard project flood (500-year) and the effect of the proposed project operation on <br />these flood flows. <br />Intermediate Regional Flood: <br />The -intermediate regional flood for Boulder Creek has a flow of approximately <br />11,000 cf<-; and crosses a sm;.ll portion of the western side of the proposed Cottonwood <br />Farm proje~et. The location of the discharge from this intermediate regional flood <br />will not be changed by this project. The intermediate regional flood for Idaho <br />Creek, which traverses the property, is 150 cfs and is to be channeled around the <br />edge in a ditch and then discharged at the point which it has historically left the <br />• property. Therefore, during times of the intermediate regional flood there will be <br />( no significant changes in the flows from this property compared to the historical <br />pattern. <br />Standard Project Flood: <br />A standard project flood for Boulder Creek historically would inundate virtually <br />all of the Cottonwood Farm property including Idaho Creek. A berm is to be con- <br />structed around the northeast portion of the property which will divert approxi- <br />mately 800 cfs of this flow further east. The flow for this standard project flood <br />in Boulder Creek is .21,000 cfs. Therefore, the 800 feet is considerably less than <br />10 percent of the total flow. <br />Direction of Stream Flow: <br />The direction of flow in Boulder Creek will not be changed in any way by this <br />project because the project is entirely east of Boulder Creek. The flow of Idaho <br />Creek will be interrupted where it has historically entered the property and chan- <br />neled around the project and then be discharged where it has historically left the <br />property. There will be no channeling or other disturbance to Boulder Creek. <br />ROCKY MOUN AIN ~GONSUL•T,{u1T5, INC. <br />~~ ~ ,o `~, <br />/ ~•. <br />1?~- <br />n Rol 1 i ~ P~ E,, ~ : _ <br />1 • ~mw ~, r ,n ~ . <br />. • ,, <br />~.~ .. <br />