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APPENDIX B <br />BOWIE NO.2 MINE - COAL MINE WASTE DISPOSAL AREA <br />PROTECTION OF THE HYDROLOGIC BALANCE <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 the <br />SEDCAD. The output data from SEDCAD follows this section. <br />The upland run -off areas are shown on Map No. 20 in Volume II. The run -off <br />curve numbers are developed based upon vegetation and soil types. Vegetation <br />data are presented in Volume III Exhibit 5 and shown on Map 3 In Volume II. <br />Solis data are presented in Volume III Exhibit 7 and shown on Map 4 in Volume 11. <br />Ditches culverts and drainage plans are shown on Figure 2. <br />CURVE NUMBERS <br />Disturbed <br />Table 2 -2d -Runoff curve numbers for and and semiarid rangelands <br />Cover Type - Herbaceous - mixture of grass, weeds and brush <br />Hydrologic Condition Poor <br />Soil Type - Loam C <br />Curve Number 87 <br />Coal Mine Waste <br />Table 2 -2d -Runoff curve numbers for acid and semiarid rangelands <br />Cover Type - Herbaceous - mixture of grass, weeds and brush <br />Hydrologic Condition Poor <br />Soil Type D <br />Curve Number 90 <br />Mixed Shrub Community 2003 <br />Vag Rep. Table V-2 <br />Baseline Reference <br />Vegetative Cover % 38.3 54.4 <br />Litter % 33.1 32.9 <br />Ground Cover % 71.4 87.3 <br />Table 2 -2d -Runoff curve numbers for acid and semiarid rangelands <br />TR -72 App. B-2 02/12 <br />