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PROTECTION OF THE HYDROLOGIC BALANCE <br />0 POND D <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 is on page Exh -8 -207 & 208. <br />The upland run -off areas are shown on Map No. 20 in Volume Il. 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 />Soils data are presented in Volume III Exhibit 7 and shown on Map 4 in Volume Il. <br />Ditches culverts and drainage plans are shown on Map 15 -3. <br />• <br />CURVE NUMBERS <br />Coal Mine Waste <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 D <br />Curve Number 90 <br />Disturbed -Poor <br />Table 2 -2d- Runoff curve numbers for arid 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 />Disturbed -Good <br />Table 2 -2d- Runoff curve numbers for arid and semiarid rangelands <br />Cover Type - Herbaceous- mixture of grass, weeds and brush <br />Hydrologic Condition Good <br />Soil Type - Loam C <br />Curve Number 74 <br />Disturbed -Fair <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 Fair <br />Soil Type - Loam C <br />Curve Number 81 <br />• RUN -OFF VOLUME - - Pond D <br />Precip Direct Run -off <br />TR -64 <br />I2 9/o7 <br />Exh 8 -17 <br />X-711 7 <br />