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PROTECTION OF THE HYDROLOGIC BALANCE <br /> 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 the 25-year event peak flow calculations is developed <br /> with the use of 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 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 /> Soils data are presented in Volume III Exhibit 7 and shown on Map 4 in Volume II. <br /> Ditches culverts and drainage plans are shown on Map 15-3. <br /> CURVE NUMBERS <br /> Coal Mine Waste <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 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 arid 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(NRCSISCS Runoff Equation) <br /> Precip Direct Run-off <br /> Area Acres Curve# Amount Run-off Vol A-F <br /> Disturbed-Poor 1.95 87 1.8 0.75 0.12 <br /> Disturbed-Good 6.71 74 1.8 0.26 0.15 <br /> TR-120 <br /> Exh.8-17 09/19 <br />