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APPENDIX B <br />BOWIE NO. 2 MINE <br />PROTECTION OF THE HYDROLOGIC BALANCE <br />GOB PILE NO.3 <br />STORM EVENTS <br />10 YEAR 24 HOUR EVENT 1.8 INCHES <br />25 YEAR 24 HOUR EVENT 2.1 INCHES <br />100 YEAR 24 HOUR EVENT 2.6 INCHES <br />The information presented for peak flow calculations is developed with the use of <br />SEDCAD. The output from SEDCAD follows is summarized on the ditch design sheets. <br />The upland run -off areas are shown on Map No. 20. The run-off <br />curve numbers are developed based upon vegetation and soil <br />types. Vegetation data is presented in Exhibit 5 and shown on <br />Map 3. Soils data are presented in Exhibit 7 and shown on <br />Map 4. Drainage plans are shown on Maps 21 1l4 & 314. <br />There are three soil types that will be disturbed at the loadout. <br />They are Work, Progresso and Potts loam_ Work and Progresso <br />are soil type C and Potts is a soil type B. The C soil type will <br />be used for the run -off calculations. <br />The vegetation study for the loadout is located In Volume III <br />Tab 5. Cover data for the vegetation types is presented in <br />Table I in the vegetation study. <br />Pastures <br />Cover <br />Vegetative Cover % 73.5 <br />Litter % 23.0 <br />Ground Cover % 96.5 <br />Table 2 -2c -Runoff curve numbers for other agricultural lands <br />Cover Type - Pasture, grassland or range <br />Hydrologic Condition Good <br />Soil Type - Loam C <br />Curve Number 74 <br />Irrigated Hayfields <br />Cover <br />Vegetative Cover % 91.6 <br />Litter % 8.3 <br />Ground Cover % 99.9 <br />Table 2 -2c -Runoff curve numbers for other agricultural lands <br />Cover Type - Meadow - continuous grass, generally mowed for hay <br />Hydrologic Condition Good <br />Soil Type - Loam C <br />Curve Number 71 <br />TR -91 Volume XI, App. B -3 12/14 <br />