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I I I I . I I I I I . I I I I I I I I Location Entrance to Ice Arena Arvada Plaza Independence Avenue County Maintenance Shops Between Miller Street and Lee Street on West 58th Avenue Miller Street Newcomb Court Nelson Court West 58th Avenue near Newcomb Court Ward Road Indiana Street Croke Canal McIntyre Street Farmers Highline Canal Church Ditch Easely Road West 60th Avenue Boulder Canal Crestone Street North Dunraven Street Foothills Road Church Ditch Easley Road Boulder Canal Table I Van Bibber Creek Structure Inventory Main Channel Structure Size and Type 6' X 4.7' Bridge 5'4" x 5'4" CBC 72" CMP 60" RCP 60" RCP 72" CMP 4' x 8' CMP Arch 4' x 6' CMP Arch 54" CMP 11'-14'-11'x7' CBC 66" CMP 24" RCP 60" CMP Siphon Flume Bridge 10' x 6' 3-36" CMP Flume Bridge 35' x 6' Bridge 35' x 6' Bridge 18' x 5.5' Bridge South Tributary No structure 5' x 3' CBC Flume Bridge Area (sq. ft.) 28 150 28.3 19.6 19.6 28.3 15.9 252 22.3 19.6 90 60 21 46 210 210 99 15 130 Legend CBC - Concrete Box Culvert CMP - Corrugated Metal Pipe RCP - Reinforced Concrete Pipe -5- - SPECIAL STUDIES - Flood Hydrology Capacity* The flood hydrology for the Van Bibber Creek basin was analyzed in the Phase A portion of the planning study. The hydrology study was completed for present day basin development, as well as projected, future development conditions. For the purposes of this planning project, the flooding potential was analyzed for the 2-, 10- and 100-year storm conditions. Flooding potential, which would result from these various frequency storms, has been defined and reported in terms of flood hydrographs as well as flood plains. 240 cfs 300 cfs 230 cfs 100 cfs 100 cfs 120 cfs 100 cfs 90 cfs no cfs 2,140 cfs no cfs 10 cfs 100 cfs 1,020 cfs 310 cfs 190 cfs 390 cfs 1,670 cfs 1,670 cfs 940 cfs As the original flood hydrology study was completed during the Phase A portion of the planning project, the hydrology analysis was revised and updated during the Phase B study. The Colorado Urban Hydrograph Procedure (CUHP) was used in this study for determining the flood hydrographs. The technical details of this procedure are described in Volume I of the Urban Drainage Storm Drainage Criteria Manual (Ref. 6). with the availability of updated hydrologic parameters, characterizing storm runoff in the Denver area, the UD&FCD revised the CUHP in July, 1975. These revisions, affecting the coefficients Cp and Ct in the CUHP, have been incorporated into the hydrology study which is utilized in this report and is the basis of all flood plain delineations and flood control facility planning. Only the 10-year and 100-year flood flows for the planned, future basin development have been recomputed using the new coefficients. 80 cfs 1,150 cfs The detailed hydrology calculations are documented and reported in the Hydrology Technical Addendum for Van Bibber Creek, dated *Capacity defined to be the discharge at which the facility becomes inadequate and the structure is overtopped. (Hydraulic grade line above road or ground surface).