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I I I I I I I I I I I I I I I I I I I .E...__III A<<hilo<tu.. ......inI Sc~ SuM"(inl f'hoeoKrammetry GREEN HORNE & Q'MARA, INC. 1111 SOUTH VAUGHN WAY SUITE 428 AURORA, COlORADO IlOO14 PHONE lOl-7S5-9000 FAX lOHS5-276S Mr. Robert Buchholz CEMRO-ED-HD U.S. AnDy Corps of Engineers 215 North 17th Street Omaha, Nebraska 68102 Re: Tri-Lakes Water Control Manual- Hydraulic Study and Model Inventory Dear Mr. Buchholz: Greenhome & O'Mara, Inc. is pleased to present the hydraulic study and model inventory for the above referenced project. The materials presented herewith represent results of the data collection efforts for the hydraulic items requested in the project Scope of Services. Brief summaries of the items included in this submittal are presented in the paragraphs which follow. The list of existing channel improvements is a compilation of major hydraulic structures within the study stream reaches. The study stream reaches are defmed as follows: I) Bear Creek from the South Platte River to Bear Creek Reservoir, 2) Cherry Creek from the South Platte River to Cherry Creek Reservoir, 3) Sand Creek from the South Platte River to Toll Gate Creek, 4) South Platte River from Baseline Road to Chatfield Reservoir, and 5) Toll Gate Creek (and West Toll Gate Creek) from Sand Creek to the Cherry Creek Reservoir Spillway. The listed improvements consist of hydraulic structures such as road bridges, railroad bridges, pedestrian bridges, drop structures, and other significant features which would affect the stream hydraulic characteristics. The list of planned channel improvements was compiled based upon personal interviews with several engineers at the Urban Drainage and Flood Control District (UDFCD). The planned improvements include major hydraulic structures within the study reaches that are intended to be constructed during the next five years. The majority of this report consists of an inventory/bibliography of existing hydraulic studies and models for the study reaches described above. Available models were identified for the inventory by contaeting various Federal, State, and Local agencies. Approximately 25 agencies were eontacted for this study, however a majority of the inventoried studies were obtained from three main sources: The Colorado Water Conservation Board (CWCB), The UDFCD, and The U.S. AnDy Corps of Engineers (Omaha District). Almost all of the local agencies perform hydrology and hydraulics projects in cooperation with the UDFCD, and therefore the studies at the individual city and county offices are duplicates of those contained within the UDFCD library. ANNAl'OlIS, -.J ATlANTA, GA AURORA, co BAlTIMORE, ...0 DULUTH. GA FAIRfAX. VA fRWUIO(S8URG, VA GREENBELT. ...0 MANASSAS. VA MEO-lANJCS8URG. PA ORlANOO, FL RALEK;H. NC ROOCVILLE. MD TAMPA. FL WAlDORF. MD WEST PAlM BEACH. Ft