Laserfiche WebLink
<br />FLOOD INSURANCE STUDIES _:._pql~~~\S COUW~~~,L,J.1,R~L: <br /> <br />HYDROLOGY <br /> <br />Detailed Studies <br /> <br />Peek discharge - frequency relations':l!]'s for the stream n,acl'c, <br />studied in detail (shown schematical1:1 :i.n Figure 'I) were ob:::aine,:: <br />from the 19RO Flood Insurance Study (;:'. I. S.) of DO'Jglas County .. <br />Unicorporated Areas (Ref. 1). Soil CnnEervati,on Service me>tl-oc',' <br />and computer program TR-20 were used in above 19RO study ~~ <br />establish these peak discharge - frequ"ncy relationships. 1'1-es,' <br />"'ere reviewed and found to be reasol"1'lhle and acceptahle hy t~", <br />U.S. Geological Survey, the Soil Cons"rvation Service, ard the <br />Colorado Water Conservation Board, The d,et,'.iled nut.p"t of <br />prol;ram TR-20 was not available. <br /> <br />East Plum Creek: Larkspur to Castl:,"_,E~()ck Re3cl!...j..2...J~_Hi..2:",,~2 <br /> <br />Peak discharges at the downstream lL,i t of this reach are those <br />established at Section "F" or upstn'cm limit of the East Plum <br />Creek at Castle Rock reach studied in detail in the 19RO FIS of <br />Douglas County (Ref. 1). <br /> <br />Discharges at the upstream limit a-e those corresponding to <br />Section "A" or downstream limit of the East Plum Creek at <br />Larkspur reach of the 19RO study: <br /> <br />E. Plum Creek <br />Locati.on <br /> <br />Drainage <br />Area ,...~.mi. <br /> <br />Peak Discharges (cfs) <br />10-":(" SO-yr 100-YI: 'iOO-vr <br />--'-'-_."'-"-"-'.~_. ------------"._~-._-"....----.(-~- <br /> <br />Dls Limit of Study <br />Reach: at Upstream <br />Corporate Limits of <br />Castle Rock (Section <br />"F" on Fig. 1) <br /> <br />8f,.7 <br /> <br />~) r 11:; n <br /> <br />10,600 14,120 23,A~O <br /> <br />-1- <br />