Loading...
HomeMy WebLinkAbout1.17 17B AnalysisFloodplain Development Report for Middle Colorado Agriculture Collaborative Fish Passage Design in New Castle, Colorado 211-020.020 Wright Water Engineers, Inc. Attachments July 2024 D.4 Bulletin 17B Analysis USGS Gage 0.2 0.5 1 2 5 10 20 50 66.67 99 Elk Creek at New Castle Computed Curve (HEC-SSP) (cfs)2547.2 2314.8 2140.3 1965.6 1731.9 1549.3 1355.6 1054.3 908.1 541.0 USGS Gage 9087500 HEC-SSP Flow rate/Area (cfs/sq mi)14.2 12.9 11.9 10.9 9.6 8.6 7.5 5.9 5.0 3.0 Upper Confidence Limits Flow rate/Area (cfs/sq mi)25.5 21.9 19.3 16.9 13.9 11.7 9.6 6.9 6.0 3.8 Drainage Area = 180 sq mi Streamstats (cfs)3150.0 2790.0 2580.0 2340.0 1970.0 1750.0 1470.0 1070.0 -- 25.5 21.9 19.3 16.9 13.9 11.7 9.6 6.9 6.0 3.8 2,536 2,177 1,923 1,681 1,381 1,165 957 687 598 376 2,536 2,177 1,923 1,681 1,381 1,165 957 687 598 376 2,536 2,177 1,923 1,681 1,381 1,165 957 687 598 376 2,577 2,213 1,954 1,708 1,403 1,183 972 699 608 382 3,394 2,914 2,573 2,250 1,847 1,558 1,280 920 801 503 Benson Pierson Nelson (Project 2B) (DA = 101 sq. mi) Peak Flow Rate (cfs) Roseman (Project 4) (DA = 133 sq. mi) Peak Flow Rate (cfs) CO & CP Pierson (Project 1A) (DA = 99.4 sq. mi) Peak Flow Rate (cfs) Ryden 1 (Project 1B) (DA = 99.4 sq. mi) Peak Flow Rate (cfs) Ryden 2 (Project 2A) (DA = 99.4 sq. mi) Peak Flow Rate (cfs) Appendix D.4 Bulletin 17B Weighted Skew Gage Analysis Overall Results Annual Exceedance Probability Elk Creek Average Flow Rate per Area for Storm (cfs/sq. mi.)