Final Baseline Hydrology Report - October 2012 - Urban Drainage ...

Sanderson Gulch Major Drainageway Plan
Baseline Hydrology Report
October 2012
Table B-4 -Design Storm Depth Comparison (Inches)
City and County of Denver
2‐Year 5‐Year 10‐Year 25‐Year 50‐Year 100‐Year
1‐Hour Point Rainfall a 0.95 1.34 1.55 ‐ 2.25 2.57
2‐Hour Total Rainfall b 1.10 1.55 1.79 ‐ 2.60 2.97
a Point rainfall depths are from Table 5.1 of the Denver Drainage Design and Technical Criteria Manual, Revised
January 2006.
b 2‐Hour Total Rainfall depths are the total rainfall depth used in the CUHP which is derived by distributing the 1‐hour
point rainfall to a 2‐hour temporal distribution curve.
City of Lakewood
2‐Year 5‐Year 10‐Year 25‐Year 50‐Year 100‐Year
1‐Hour Point Rainfall ‐ ‐ ‐ ‐ ‐ ‐
2‐Hour Total Rainfall 1.18 1.6 1.9 ‐ 2.6 2.95
Source : The Blue Book (Storm Drainage Criteria Manual) of City of Lakewood, the one‐hour point rainfall depths are
unknown.
UDFCD Urban Storm Drainage Criteria Manual (USDCM), Version June 2001 Revised April 2008
1‐Hour Point Rainfall a 0.98 1.40 1.65 2.01 2.30 2.57
2‐Hour Total Rainfall b 1.13 1.62 1.91 2.32 2.66 2.97
a Point rainfall depths are from Figure RA‐1 through RA‐6 of the USDCM.
b 2‐Hour Total Rainfall depths are the total rainfall depth used in the CUHP which is derived by distributing the 1‐hour
point rainfall to a 2‐hour temporal distribution curve.
Appendix B ‐ Hydrologic Analysis