Laserfiche WebLink
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 peak flow calculations is developed with the use of the <br />SEDCAD. The output data from SEDCAD is on page Exh-8-207, 208 & 2081. <br />The upland run-off areas are shown on Map No. 20 in Volume II. The runoff <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 <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 />Sail Type -Loam C <br />Curve Number 87 <br />RUN-OFF VOLUME - -Pond D <br />Area <br />Disturbed <br />Coal Waste <br />TOTAL <br />Precip Direct Runoff <br />Acres Curve # Amount Runoff Vol A-F <br />3.48 87 1.8 <br />3.28 90 1.8 <br />6.76 <br />TOTAL REQUIRED WATER VOLUME --A-F <br />SEDIMENT VOLUME -Pond D <br />Use the universal soil loss equation. <br />A=RKLSCP <br />R =rainfall factor <br />TR-44 <br />3~ZO a-7 <br />Exh 8-17 <br />0.75 0.22 <br />0.93 0.25 <br />0.47 <br />0.47 <br />30.00 <br />09/06 <br />