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. Form 4 1, Downstream Limit for the new Interceptor Channel is the confluence with the South Platte River. Downstream Limit for the effective flood hazard information is the confluence between the Pawnee Creek Overflow and Sand Creek 2,1: Effective model not available from Michael Baker, Duplicate effective model not Applicable to this project due to the rerouting of flows 2.2: Not Applicable, new channel 2.3: Not Applicable, new channel 2,4: Proposed HEC-RAS files: . PropVchan.pIj Prop V chan,fU2 Prop V chan,fU4 Prop V chan,gO I Prop V chan,p02 Prop V chan,p03 Prop V chan,rep Prop V chan2.rep 10/26/0 I 10/25/01 10/26/01 10/23/01 10/26/01 10/26/01 10/26/01 10/26/01 Project File FEMA flows I OO-yr Flow for Floodway Geometry File Plan File for 500,100,50,IOyr Plan File for Floodway Floodway Report Multiple Profile Report Starting water surface conditions for the Interceptor Channel were based on normal depth calculations since the drainage basin for Pawnee Creek is much smaller than the South Platte River. Our calculations indicate that the ration of drainage areas between Pawnee Creek and the South Platte River is 0,038, 3, 4.4 None of those results appear 5,l.a New Profile created for Pawnee Creek Overflow Interceptor ChanneL The Effective Pawnee Creek Overflow profile should be removed from the City of Sterling FrS, and a new Pawnee Creek Overflow Interceptor Channel profile should be added to the Logan County FIS, A tie in to the effective downstream profile for the Pawnee Creek Overflow is not applicable due to the rerouting of flows, A graphical floodplain tie in has been made along County Road 22\12 (the upstream limits of the project). 5,l,b and c, No effective regulatory floodway .