1. Logan Dry Canyon Detention Basin Design Case Study
Reading
HEC HMS Users Manual (
P on Frequency Storm
HEC HMS Technical Reference Manual (
P gives technical details on the alternating block method and development of frequency storm
Logan Dry Canyon Study Reports (in Canvas)
HydrologicModelingSedimentYieldandSedimentTransportAnalyses_Oct2006.pdf
Pages Introduction, design storm, hydrologic analysis.
USACE Dry Canyon Study.pdf.
Pages 1-13 to end of section on Hydrology.
Technical Memoranda_CorolloEngineers_Jan2007.pdf.
1-1 to PDF Executive Summary
2-1, PDF 12. Hydraulic model overview
3-1 to 3-8, PDF Desiltation basin
PDF RB&G geotechnical design report

2. TL=52 min. GA Params for Loam
This uses streamstats average slope of 53%

3. Design Study 6 hour Hydrograph
From Anderson Consulting Dry Canyon Design, 2006

4. TL=87 min. GA Params for Loam
This uses longest flow path length slope of 19% that results in longer lag time

5. TL=52 min. K=2.1 in/hr (smallest in soil tests)
Note significantly smaller discharge volume and peak

6. TL=52 min. CN=63. 12 Hr freq storm

7. TL=87 min. GA Params for Loamy Sand