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<br />STUDY AREA DESCRIPTION <br /> <br />primarily sagebrush aod prairie grasses. <br /> <br />The soils within the basin <br /> <br />are rr~domjn~tly of the Olney-Kim-Otpro Series. <br /> <br />Th" Soil ("'nnserViltlon <br /> <br />Drainage Basin Characteristics <br /> <br />Service describes <br /> <br />thesc <br /> <br />soils as deep, nearly level to moderately <br /> <br />The Slough was studied in detail from John law Reservoir <br /> <br />to lLS <br /> <br />sloping, well drilined, sandy loams, and loams form.,d in mixed allu"iu", <br /> <br />mile <br /> <br />north of Weld County Road <br /> <br />74; a distance of about one mile. <br /> <br />and eolian deposits. <br /> <br />Stream bed elevations in the study reach range from 4859 <br /> <br />feet above <br /> <br />mean <br /> <br />sea level <br /> <br />(m.s.l,) <br /> <br />" <br /> <br />4874 feet above m.s.l, <br /> <br />The stream bed <br /> <br />Study Reach Description <br /> <br />slope ranges from 0.~ne2 feet/foot (1 foot/mUe) to <br /> <br />0.0055 <br /> <br />feet/foot <br /> <br />Th, <br /> <br />study reach <br /> <br />is centered <br /> <br />about <br /> <br />eh, <br /> <br />town of <br /> <br />Severance, <br /> <br />(29 feet / mile). <br /> <br />Colorado, <br /> <br />with its lOloler limit at law Reservoir just south of town. <br /> <br />The <br /> <br />total <br /> <br />drilinage <br /> <br />area of <br /> <br />the basin upstream from John Law <br /> <br />The upper limit is located northlolest of town and just south of County <br /> <br />Reservoir <br /> <br />is about <br /> <br />37 <br /> <br />square miles. <br /> <br />Considerable <br /> <br />irrigation <br /> <br />Road 74 1/2 as Indicated on the basin map, <br />The portion of The Slough studied is in a potential development <br /> <br />development has <br /> <br />taken place <br /> <br />io <br /> <br />the basin consisting of canals and <br /> <br />reservoirs. <br /> <br />The reservoirs having the most effect <br /> <br />upon The <br /> <br />Slough <br /> <br />area for the town of Severance. <br /> <br />At present the flood hazard <br /> <br />Co <br /> <br />", <br /> <br />floodflows at Severance are Black Hollow and loop lake located about 5 <br /> <br />community <br /> <br />Is minimal, but It can increase unless ildequate regulations <br /> <br />miles and <br /> <br />2 miles upstream from Severance respectively. <br /> <br />The larimer <br /> <br />are adoptod. <br /> <br />County Canal and Eaton Canal <br /> <br />are <br /> <br />the primary ditches trilnsporting <br /> <br />Table 1 <br /> <br />watet" <br /> <br />into <br /> <br />the basin. <br /> <br />The pierce Lateral and Collins Lateral of the <br /> <br />Larilner County Canal transport I.lilter out of <br /> <br />the hasin as does the <br /> <br />Rainfall Depths for 3,.hour storm d'Jratlon at <br />various frequencies (inches) <br /> <br />:':Jton Canal <br /> <br />. " <br />"" <br /> <br />a <br /> <br />t'averses th"draln<lg... <br /> <br />~ailur" of a"y "f lh",;" <br /> <br /><'''yu"",.;y <br /> <br />C)"l'lll <br /> <br />structures loIill cause at least isolated <br /> <br />flooding <br /> <br />below <br /> <br />the failure <br /> <br />Hl-year <br />5<l-year <br />10\:-year <br />5~\l-year <br /> <br />1.f17" <br />2.64" <br />3.05" <br />4,;);)" <br /> <br />point. <br /> <br />i';e.. 8asin /'lap, plate 1, for the area studied and <br /> <br />locations of <br /> <br />noted structures. <br /> <br />The average annual ~recipitation over the study basin <br /> <br />is ilround <br /> <br />Obstruction <br /> <br />" <br /> <br />flood <br /> <br />flows within the <br /> <br />study r.,aeh <br /> <br />Includ.. <br /> <br />12 <br /> <br />itlc),..,,q <br /> <br />of wnich ilDout toWll <br /> <br />occurs <br /> <br />in tene period May througn <br /> <br />culverts at Wela county Road -/4 ilnd Ureat western k/ldroild crosslngs, <br /> <br />September. Meiln temperiltures range from a high of 7-' degrees F in July <br /> <br />some fences, and a few buildings. <br /> <br />to a low of 24 degre.,s F in January with an annual ~ean of 48 <br /> <br />degrees <br /> <br />Ther<lare no eKi5ting or "uthorized flood control <br /> <br />structur.,s <br /> <br />'" <br /> <br />... <br /> <br />t'l" study ere" end n()ne are under invesligation ilt this time. <br /> <br />The basin is predoml nanU Y a'l r icul tur ill wi th scatte~ ed cottonlolood <br /> <br />trees along <br /> <br /><h, <br /> <br />stream bottoms. <br /> <br />Native vegetation <br /> <br />present <br /> <br />" <br /> <br />5 <br /> <br />6 <br />