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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 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 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 />Disturbed <br />Table 2-2d-Runoff curve numbers for grid 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 />RUN-OFF VOLUME - -Pond D <br />Precip <br />Area Acres Curve # Amount <br />Disturbed 4.29 87 1.8 <br />TOTAL 4.29 <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 />K =soil erodibility factor <br />LS =combined length slope factor 400' - 2% <br />Use Ditch D1 Length & Slope <br />• C =cropping management factor <br />Direct Run-off <br />Run-off Vol A-F <br />0.75 0.27 <br />0.27 <br />0.27 <br />30.00 <br />0.37 <br />0.31 <br />1.00 <br />TR-43 Exh 8-17 08/06 <br />A PPRo~ <br />9 /N/o 6 <br />