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<br />Basin characterj_stics wf~re estimated 'l:or both existing and <br /> <br /> <br />futl.re conditions) as shown in the tahle; value::, for existing conditions <br /> <br /> <br />WerE' based on the aerial photographs and f Le ld i.nspections) while the <br /> <br /> <br />futLore values were estimated after eX;lminat_ion of zoning planst land-use <br /> <br />maps, availability of utilities, and (liscu8s-iollS with officials from <br /> <br /> <br />Aurcra, Adams County and Arapahoe County. <br /> <br />At present, the total b~sin is m(:r~ 1~llan 95 percent pervious, <br /> <br /> <br />and the area upstream from Smith Road in Arapahoe County is almost 100 <br /> <br />percent pervious. <br /> <br />It is difficult to project how the development of the <br /> <br />basin will take place; but, areas of t.he basin such as those near Inter- <br /> <br />state 70, area between Interstate i6 (formerJy I-80S) and Brighton Road, <br /> <br /> <br />and area near 56th Avenue and Buckley Road, will experience a faster <br /> <br /> <br />rate of development than other areas. As lhE~ l:E~al estate is improved 1n <br /> <br />the future) the unit hydrograph con~~L;mLs c: and C "rhich are a measure <br />t p <br /> <br />of the conveyance characteristics in ,:I s-.lb-.basin) ",ill change. In the <br /> <br /> <br />future, Ct values will be samller, refole:tj_ng a short_er peaking time, <br /> <br /> <br />and C values may be slightly more, illdi:ating a larger peak discharge. <br />p <br /> <br />All of these factors will tend to makp a laO-year flood of tomorrow <br /> <br /> <br />greater than a 100-year flood of today. <br /> <br />The underlying philosophy used to determinE the degrRe of per- <br /> <br />Vlousness under future development cOIldi'~ions, fr:r differen1~ sub--ba~;ins <br /> <br />is as follows: <br /> <br />1. Area upstream from Smith Hoad (A,apahoe Highway (1) is <br /> <br />assumed ~~o be developed into low dell~, i ly residential area. <br /> <br />Sizes <br /> <br />of lots are assumed to vary from 2,:) t J 1.0,0 acres) and in some <br /> <br />instances even greater than 10.0 aCI-es. <br /> <br />TIlis covers sub-areas F-:L <br /> <br />through F-7 and T-l through T-5. <br /> <br />2. Sub-areas F-8 through f"-L: ~-ld small portions of sub- <br /> <br /> <br />areas F- :~2, T-6, and T-7 are assumed L,) he developed i.nto a combin- <br /> <br />ation of low residential, industria] ,HId commercial areas. <br /> <br />Tt.is is <br /> <br />II-] <br />