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PREFACE. ., TkU. Il.epOItt ducM.bu the. 6tood c.IuvuleWti.I..ue6 06 the. Big Thomp4on JUVeIL and .the. Uttte. Tholllp4on JUveIL .in e.a.6teILn LlVLimeIL Coun:ty, Co.lolUUlo, and the. Uttte. Thompl>on JUVeIL .in noltthVln BouldeIL Coun:ty, Co.lolUUlo. The. 4t.uJ.y Jr.ea.c.h 06 the. Big Thompl>on JUveIL e.x.te.nd4 61tOm about 2 mU.u 40utke.a.6t 06 Love.lo.nd d0wn4.tMAlII to the. LIVLimvr.- Wtl.d Coun:ty tine. The Uttte Thompl>on IU.vell. 4tu.c!y Jr.eac.h e.lC.tendl> 61tOm the e.a.6tVln 6a.ce 06 the Rocky Mowr:t.a.i..rr.4 a.bout 7.5 mU.u 40uth- wut 06 8eJtthoud dOwn6t1r.ealll to the LlIII..imeIL-Wtl.d Coun:ty Une. Land U4e atong thue 4t1r.ea.m6 .u. p1ti.maJL.U.y a.glli.cu1.twr.a.l.. TkU. Jr.e.poltt Wa.6 plLepalted 60Jr. the gu.ida.nce. 06 .local 066i- ci.ai.t. .in pla.nn.ing the u.se and Jr.egula.ti.on 06 the 6.lood p.t.a.in. Two pote.ntiAl 6.loodl> welle u.sed to Jr.epILuent degJr.e.e.6 06 ma.joJr. 6.looding tha.t MY OCCUll. .in the 6utwr.e. Thue t1IJo 6toodl>, the 100-ye.aIt and tht. 500-ye.aJt, alte de6.ined .in the Gl.o44aJty and 4hould be g.iven appltO- pJt.i.a.te cOn6.ideJta..t.ion .in p.fa.nn.i.ng 6oJr. 4a.6e.ttJ 06 development .in the 6.lood p.t.a.in. The. t1IJo pote.ntiAl 6toodl> alte 6U1l.theIL de6ined by 6l.ooded aJtea. ma.p4 tha.t 4 how the appltO u.ma.te. altea4 tha.t would be .inunda.te.d. F .lood pltO 6il-e.6 4 how the WCttell depthJ. Jr.e.la.tive to the 4t1r.ealllbed a.nd 6.lood el.eva..ti.on6 a.Cl1044 the w.idth 06 the va.U.ey. CIt044 4e.c..t.ion6 alte pJr.uented to .indica.te gJr.ound te.vel. a.Cl1044 the va.U.e.y and the OVell.- ty.ing 6.lood depthJ.. The 6.lood pJr.o6Uu and 6tooded altea. data. plLe- 4ented aile ba.6ed on the ew.ung c.ondi..ti.on6 06 the ba.6.in, 4t1r.ealll, and va.U.ey when the Jr.epoltt ICIQ.6 plte.palled. P044.ibte 6utwr.e .unpltOve- me.nt.l to contlwt 6.loodl> alte not a. c.On6.ideJr.a.tion 06 tki.4 Jr.epoltt. The .in60Juna.ti.on .in tki.4 11I/.pOItt doe.6 not .impty any Fe.dvr.al .inteILe.6t OIL autholli.tlj to zone. Oh. Jr.egulate. u.se 06 the. 6tood pl.a.in; tki.4 .i4 a. .local Jr.upon6ib.iU.ty. The. Jr.epoltt pltOv.idu a. 4u.Ua.bte. ba.6.i4 6oJr. the. arLop- wn 06 tand u.se. c.ontlr.ot4 to gu.ide. 6.lood plain development wUh c.on6.ideJta..Uon 6oJr. env.vr.onmental. a.ttIUbutu, thelLebYplLe.ve.n.ting inten- 4i6ic.a.t;i.cn 06 .lo44 pJr.obtem4. Bec.au.6e the. Jr.epoltt .identift,ie.6 6.lood pItObtem4, it wilt 4.tUnula.te the. devel.opme.nt 06 otheIL 6.lood dama.ge. itedu.etion te.c.hn.i.quu 4uc.h a.6 6l.ood c.ontlwt, Jr.emova.t 06 ob4t1r.uc..ti.0n6, and Mood pltOo6ing; thue tec.hn.i.quu miglLt be. u.se.d in an ovelU1U. Ftood Pl.a.in Management (FPM) pltOglUUll. At:. the M.qUUt 06 the. 60JuneIL LlVLimell.-WeU Regionat Pl.anning C01llllU4ion, now the LlIII..imeIL-Wel.d Regionat CouncU 06 GOVeJtn1lle.n..t.4, tJvr.ough the Co.lolUtdo WateJL COn6vr.va..ti.on Bocvr.d, tki.4 Jr.e.poltt ICIQ.6 pJr.e.- paJted by the. Oma.ha. V.i4.t1li.c..t, COII.p4 06 Eng.ineeJt6, undell the. continu.ing autholli.tlj pltOv.ide.d .in Section 206 06 the. 1960 F.lood Contlr.ot Ad (PubUc. Law 86-645), a.6 amended. The coopeJr./1.Uon 06 tocal 06ft,icUtt.4 and pubUc. and p>r.ivate .intelr.e.6U in pltOv.id.ing a.64.i4tanC.e. and ..in60Juna.tion ICIQ.6 m04t ht.f.p6ul. V.i4.tJl,ibution 06 the. Il.epoltt to 06ft,icia.t4, a.gencie.6, and .i..ndi.Vidtll1.t4 COnc.Vlned wUh pta.nn.i.ng .in the. altea. c.oveILe.d wilt be marLe. by LlVLimell. Coun:ty and by Bouldell. Coun:ty. The. CoJr.p4 06 Eng.ineeJt6 wilt pltOv.ide. .inteJtp1l.e.ta.t.i..on and tecWcal a.64.u.tanc.e, i6 ll.e.que.6te.d, ..in .the. appUc.a.ti.on 06 the. Il.e.poltt da..ta.. Othell. gu.i.de.Une.6 a.vail.a.bte 61tOm the. COJtp4 06 EnginetM alte a. pamphlet, "Guide..Unu 6011. Reducing F.lood Vama.gu", and a. booktet, "Intlr.odaction to Ftood Pll.oo6ing". i ,>