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<br />n <br /> <br />~sultB of Hydraulic Analysis <br />Flood profiles ere given in Figure 15 for the LOla Park Tributary and <br />Fi~re 16 for the Eastern Flo~ ~th. ~e water surface elevations are given <br />in Table 6. ~ detailed description of the hydraulic analysIs performed la <br />included in the Technical Addendum. <br />The n4ture of the Western Plow Path topography prohibited effective HEC-2 <br />modeling for this reach. For drainage improvement calculations, the flow at <br />the elementary school was split bassdon the flood......, developed by the <br />Colorado Water Conservation Board in "Milliken Flood of June 3. 19S'. <br />and manual caloulations. <br /> <br />8ro"ion and Sedimentation <br />The processes of erosion and deposition are active in the study area <br />because cultivated fields dominate the drainage basin. Soil detaches end is <br />carried by runoff waters until the flow yelocity is inadequate to keep the <br />soil partiCles in auspension. This settling occurs in Milliken where e~nk_ <br />ments obstruct the natural flow and pond water. <br />Sediment yield in the basin was predicted using the Modified Universal <br />Soil Los" t;quation (MUSU:, Willi""", and Berndt, 1972). Orainage i..provement <br />structu..:es were to be si:oed to accOlDOdate the lOa-year owent so the <br />corresponding rainfall amounts and intensities were used in this phase of the <br />analyA1... o.,tails of tIli.. "",thod along with CIllculatione can b.o found in the <br />Technical Addend~. <br />Averaq<! sedimentl"ield in the basinwes deterndnedto be a.S6 tons per <br />acre per 100-year storm. This would equal approxi..ately a tandem dump truck <br />f..ll of soU from """'..:y 30 acree. ay no ....an.. will all of the ....dilllent <br />detach"d reach MilHk"n. "s.. conservative dadgn consideration however, a <br />ten percent Sediment velum" allowanoe was included for locationa in which the <br />design flow velocity oould drop below two feet per second (fpa) allowIng R~dl_ <br />ment to settle out of euspension. <br /> <br />Street Flow Net <br />A well conceived street system is an int~r9ral pa~t of an effective <br />m~nicipal drainage syste~. Milliken's streets are. for the most part, unpaved <br />