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II I I I I I I I I I I I I I I I I II I CWCB HvdroloQV Worksheet Page 1 Title of Study: County: Calculations By: FIS ' Arapahoe County and Incorporated Areas Arapahoe jag Date: January 2, 2001 Documentation This workbook estimates 100-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 ---.-oM IsPL-2: South Platte, Southern Foothills Subregion Status of Regression Equations for this sub'region: Accepted Regression Equation Data Q=aAb Where: Q = Discharge (cfs) A = Drainage Area (square miles) a = coefficient = b = coefficient = 1005.5 0.638 Limited by: Minimum Drainage Area = Maximum Drainage Area = 1 square miles 170 square miles Discharge Calculations Discharge Drainage 100-year PointlD Discharge Point Description Area (mi2) Discharge (cfs) Sl Unnamed Creek Tributary - at mouth 0,65 Outside Bounds -,-~--_.. S2 Unnamed Creek, immediately upstream of tributary 0.54 Outside Bounds S3 ---- Unnamed Creek. at East Quincy Avenue .. -~~621 2,11 S4 Unnamed Creek. at Aurora city limits ...... ,,_..,- 4.22 2,521 ~S5 Sampson Gulch, at mouth ----.. 2,71 1,899 S6 Senac Creek - at Aurora Reservoir 4.99 ,','~,-- 2,804 Senac Creek - at mouth ---- ---- - _._-,-- S7 9,84 4,~__ S8 Coal Creek - at ElberVArapahoe County line 30.65 _~c92!~ S9 Coal Creek - at East Quincy Avenue 52.40 12,569 S10 Coal Creek - immediately upstream of tributary 55.81 13,085 Coal Creek Tributary - at East Quincy Avenue - Sll 7.75 3,713 S12 Coal Creek Tributary - at mouth 64,08 14,291 S13 First Creek. 2 miles south of 1-70 at north line of S15 3.66 2,301 .., S14 West Box Elder Creek - at 1-70 15.67 5,819 S15 Box Elder Creek - at ElberVArapahoe County line 128.15 22,239 S16 Box Elder Creek. at East Quincy Avenue _.1..46,95 24,268 1/2/01 CWCB_Hydrology.x1s