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Flood plain ""'na.~eme'H nu<lfeg are c"rried OLl~ 'w the Soil r,C>nservathn S~rvtce a~ an outKrowth of the rccomrnendatlonll. in ~ Report by the Task Force on Federal Flood Control PoUcy, I'.,,,,.e DOCllrnent '10. ~65 (8gth ('.o~p;re"s, AUgll"t 10, 1966), c~pecially Recamm~ndll.tion 9(c), Rep;ulatlon of La~d Use, which reca~ended the preparation of pr~ll~inaty repottg for ~ldance in tho~e areas whete assistance 18 needed before 1\ full floQd plain infotmatton report can be prepatedot wherc a full report is not scheduled, AuthorHy for funding flood plain mana>:eroent studies is provided by Section 6 of Public ~w 83-566, which 8.uthori2e~ the II.S. ~p~rtrnent of ~rlcu1ture to cooperate ~lth other federal, ~tate and local a~encles to OIl1.ke i"vestlg,~tions and surveys of the wstershed~ and rivers and <>ther waterways as a basis for the development of coordinated pro~rams, In carryin~ out flood plain mana~ement ~tudieB, the Soil Conservation Service Is being responsive to Executive Order 1198~, entitled "Plood Plain i'lanal(eroent", .md Executive Order 11990, entitled "Protection of \letlan,ls" (hoth effective May 24, 1977). DESCRIPTION OF THE STUDY AREA Drainage Basin The !Hi': Sandy Cr....k is a. AA.lOr tributary to the Arkansas 'Uv"r. H hilS It" head....aters In the e,~stcrn fri"ge of the Black Forest area about 2 S ro{1e.8 northeast of Colorado SprinRs, Colorado. Prom this aces ~i.o: Sandy Creek flow" nonh"BBt to River Bend, Colorado, ~here It turns abruptly and flows southeaat to Limon, Prom Limon the Bill; Sandy Creek flo,," southeast II.nd then Bouth approximately 127 miles to its confluence with the Arkansas River eaat of Lamar, Colorado. The study area Is located ~ith TlSGS Hydrolo>:ic Unit CodelIOZOOll. The study srea lfes withi" the Colorado Pied"ont section of the Grest Plalos physio>:raphic province. Elevationa range ftom Over 5,380 feet to less eha" ~,340 feet above mean se" level, Soils in the .~rea are predomi- n"ntly silty clny loama developed from shale of the Pierre form"tion, Big S"ndy Creek drains ahout 342 squa~e mil"s ahove the 'ltudy "r"<1. The Limon W"t~r"hed tributaries to ~il( Bandy Cr""k dratn an addit ional I ~ squ"remlles, Cliroate The climate Is s"rol-arld. The aver"~" ~nnual precipitation at Limon 1s 14.67 inches, of which 76 perceM occurs during the 6ulfnH ",onths, Torr..n- tial summer thunderstorms that occur Over """,11 area" "n~ have" short dura- tion are typical of this "rell_ The av"r,,~~ "nn,,~l ~"""f...U !s "bout 2S Inch..... The reenrded temperatures have ran~ed from" hl!':h of In4' to a 10~ of ..,Inu" V\O (fah~enhe1t). The mcan dailv temperature 1s 47.1'. The fr'lH- fr~,> no"'in~ ""asOn a"..rnr:"~ 14n ~ays 3nd the 'Innlla1 evapnratlon "vera~"s 'is inch"... 3 "