Boulevard Wind Study - Notes 130123 Water requirement:  125,000 gpd during the first 3 months of construction; later to be reduced to 60,000 to 75,000 gpd [2-13]. Base water requirement for 11 months of construction: 60,000 gpd × 30 days × 11 months = 19,800,000 gallons = 60 ac-ft Peak water requirement: 125,000 / (24 × 60) = 87 gpm. Minimum water requirement during construction period: 60,000 / (24 × 60) = 42 gpm. Water requirement during operations (25-35 years):   210 gpd for sanitary facilities. A Campo Creek tributary watershed of 1,691 acres has been identified [Figure 1, Appendix A]. 12 residences, 0.5 ac-ft/yr per dwelling unit, makes total usage of 6 ac-ft/yr. Future anticipated GW needs in the study area: 15.2 ac-ft/yr Estimated capacity of two existing wells, accounting for interference: 50 gpm. Depth of residuum (between soil and rock): 102 and 130 ft (documented in the wells). Estimated storage coefficient in rock (which could range from 0.0001% to 1%): 0.1% Measurements in Poway indicate 30% for alluvium, 3% for decomposed rock, and 0.03% for fractured rock. Assume a saturated thickness of 500 ft. Volume in rock aquifer storage: 1,691 ac × 500 ft × 0.001 = 845 ac-ft. Volume in saturated residuum: 1,691 ac × 25 ft (estimated average depth) × 0.05 (estimated coefficient of storage) = 2,113 ac-ft Volume in saturated alluvium: 179 ac (estimated area) × 10 ft (estimated average depth) × 0.05 (estimated coefficient of storage) = 89.5 ac-ft Total storage: approximately 3,000 ac-ft. The equation for runoff calculation is incorrect (units are not consistent). Mean annual precipitation: 15-18 in. Average runoff: 25% (too high). Average annual recharge to GW: 1.37 in, or [ 1.37 / 16.5 ] 100 = 8.3% Average anual recharge volume: 1,691 ac × [1.37 in / 12 in/ft] = 193 ac-ft/yr