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I I I I I I I I I I I I I I I I I I I I eweB HvdroloQV Worksheet Page 2 Title of Study: County: Calculations By: FIS - Boulder County and Incorporated Areas Boulder jag Date: December 4, 2000 Documentation This workbook estimates 1 OO-year discharges for approximate floodplains in Colorado using the following source: Browning, T.W. 1999. Guidelines for Determining 100-year Flood Flows for Approximate Floodplains in Colorado, Version 4.0. Colorado Water Conservation Board. January. River Basin ,--.--------- ----- I SPL.. 3 :So--"th !1.".tt",Central Foothills Subregion Status of Regression Equations for this sub-region: "R Accepted Regression Equation Data Q=aAb Where: Q = Discharge (cfs) A = Drainage Area (square miles) a = coefficient = b = coefficient = 762.4 0.546 Limited by: Minimum Drainage Area = Maximum Drainage Area = 1 square miles 175 square miles Discharge Calculations Discharge Drainage 1oo-year PointlD Discharge Point Description Area (mi2) Discharge (cis) S3 Geer Canyon - at mouth 6.41 2,102 S4 Sunshine Canyon Trib, (Mount Santas Rd.) - at mouth 0.28 Outside Bounds S5 Sunshine Canyon - immmediately uls of Tributary 1.51 955 S6 Sunshine Canyon - at mouth 1.89 1,078 S7 Gregory Creek - atmouth 1.94 1,095 S8 Bluebell Canyon Creek - at Anderson Ditch Extension 0.45 Outside Bounds S9 Kings Gulch - at Anderson Ditch Extension 0.41 Outside Bounds S10 Skunk Creek - at AnderSon Ditch "ExtensiOn .. - --.- 0.82 Outside Bounds S11 --------- Bear Canyon Creek - at NCAR Road 2.94 1,374 --"-- .. ~- _. -- ------ ---._-- ----- .._-~ .. l------ --- - ---- ----.- 1---- ------ ---- ---- e--. e-- -- -- .. -- .------- " 12/4100 CWCB.Hydrology.xls