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Table 18: Minimum Storage Volume (Ditch/Spillway System Capacity = 2,000 cfs) <br />Runoff Storage Volume (ac -ft) <br />(System Capacity = 2,000 cfs) <br />Return Period <br />Clark UH <br />(CN Losses) <br />Clark UH <br />(Ksat) <br />RMUH <br />(Kurt) <br />RMUH <br />(Ksat) <br />100 -Years <br />500 -Years <br />-- <br />- <br />-- <br />1,000-Years <br />-- <br />- <br />- <br />-- <br />10,000-Years <br />-- <br />94.98 <br />-- <br />PMF (6 -hr) <br />-- <br />94.34 <br />217.67 <br />124.90 <br />PMF (72 -hr) <br />72.48 <br />-- <br />109.28 <br />-- <br />Table 19: Minimum Storage Volume (Ditch/Spillway System Capacity = 2,500 cfs) <br />Runoff Storage Volume (ac -ft) <br />(System Capacity = 2,500 cfs) <br />Return Period <br />Clark UH <br />(CN Losses) <br />Clark UH <br />(Ksat) <br />RMUH <br />(Kurt) <br />RMUH <br />(Ksat) <br />100 -Years <br />500 -Years <br />1,000 -Years <br />10,000 -Years <br />PMF (6 -hr) <br />-- <br />34.40 <br />187.99 <br />77.58 <br />PMF (72 -hr) <br />List of Attachments <br />1. Sub -Basin Characteristics Map <br />2. Hydrologic Soil Groups Map <br />3. Land Cover Map <br />4. Land Cover and Hydrologic Soil Groups Map <br />5. Plate IVb of HMR No. 55A <br />6. San Luis Tailing Dam — Flood Frequency Graph <br />\\BIL-FS\BIL-projects\26\21099-01\95Rpts\San Luis Flood Hydrology Study_R2.docx Page 10 of 10 <br />