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SRF Consulting Group, Inc. <br />Comm. # _4443__ <br />Designed by: _JJK_ Date _10 /17/03__ <br />Checked by: _ Date <br />Pond Volume Computation -- English Units <br />SCS Methodology <br />Pond Location <br />Rainfall event <br />Initial Abstraction <br />Eaglebrook Church Phase <br />2.5 inches (typically use 2.5 inches if sediment loading is included here) <br />0.2 (typically 0.2 Type B Soils <br />) <br />Dead ueaa <br />Sub- Pool Pool <br />Drainage Sub -Area Area Area Runoff ' Runoff Volume Volume <br />Area Description (acres) (hectares) CN (inches) (mm) (ac -ft) (m3) <br />lower Parking Lot 10.73 4.34 98 2.27 57.68 2.03 2504 <br />lower Meadow 38.90 15.74 58 0.13 3.39 0.43 533 <br />Totals 49.63 20.09 2.46 3038 <br />Sediment Loading <br />(25 design life is the typical critieria) <br />Area <br />(acres) <br />Avg. <br />Erosion <br />Rate <br />(tons /ac/yr) <br />Erosion <br />Time <br />Period <br />(years) <br />Erosion <br />(tons) <br />Area of Construction <br />50 <br />1 <br />Turf Establishment <br />2 <br />1 <br />Tributary Developments <br />1 <br />2 <br />Total Drainage Area <br />1 <br />23 <br />Gross Erosion <br />Predominant soil type (sandy, silt, silty clay, or clay) silty clay <br />Sediment delivery ratio for watershed ( %) (See worksheet labeled Fig. 1) <br />Basin trap efficiency ( %) -- typically use 90% 90 (See worksheet labeled Fig. 2) <br />Estimated sediment density in basin (pcf) 90 (See worksheet labeled Table 2) <br />Volume required for sediment storage acre -feet cubic- meters <br />Sediment Loading <br />(25 design life is the typical critieria) <br />Total Required Permanent Pool Volume <br />As calculated on this sheet: <br />Or user input (if not calculated above): <br />2.46 acre -feet <br />acre -feet <br />3038 cubic- meters <br />cubic- meters <br />H: \Civil \047\4443 \DRAINAGE \EXCEL \Dead Pool Size_IblargexIls <br />Area <br />(acres) <br />Avg. <br />Erosion <br />Rate <br />(tons /ac/yr) <br />Erosion <br />Time <br />Period <br />(years) <br />Erosion <br />(tons) <br />Area of Construction <br />50 <br />1 <br />Turf Establishment <br />2 <br />1 <br />Tributary Developments <br />1 <br />2 <br />Total Drainage Area <br />1 <br />23 <br />Gross Erosion <br />Predominant soil type (sandy, silt, silty clay, or clay) silty clay <br />Sediment delivery ratio for watershed ( %) (See worksheet labeled Fig. 1) <br />Basin trap efficiency ( %) -- typically use 90% 90 (See worksheet labeled Fig. 2) <br />Estimated sediment density in basin (pcf) 90 (See worksheet labeled Table 2) <br />Volume required for sediment storage acre -feet cubic- meters <br />Total Required Permanent Pool Volume <br />As calculated on this sheet: <br />Or user input (if not calculated above): <br />2.46 acre -feet <br />acre -feet <br />3038 cubic- meters <br />cubic- meters <br />H: \Civil \047\4443 \DRAINAGE \EXCEL \Dead Pool Size_IblargexIls <br />