EnvironmentalInfiltrates or reuses all rainwater falling on the site for up to a 5-year storm event, preventing an estimated 48,878 gallons from entering the local municipal stormwater system for each 5-year event. Table 1: 5-year Small Area Unit Hydrograph Results (Source: RFB Consulting) 1 Derived from construction document takeoffs. Site Paving Plan, Concrete Stairs, & Roof Deck: 6029-BSCN.dwg. 2008. EPT Design.The peak discharge for pre-development, for expected development without BMPs, and for expected with BMPs was calculated by the stormwater consultant alongside the design team. The equation used to calculate peak discharge is Q = C*i*A, where Q is peak discharge, C is the runoff coefficient of the land cover material, i is the average intensity of rainfall on the site per the time of concentration (Tc), and A is the drainage area (San Bernardino Hydrology Manual, 1986).The pre-development condition produced a calculated 4,758 gallons of runoff during a 5-year storm event. With the BMPs implemented (thus increasing the time of concentration and decreasing the amount of runoff), the site was anticipated to produce 48,878 gallons of runoff. The site however collects 100% of the runoff by means of the BMPs, which store runoff in the cistern or infiltrate it into the ground. Ultimately all water is infiltrated to recharge groundwater.
Reduces irrigation water needs by over 75% as compared to a conventional Southern California landscape through the use of water-wise native plants and an efficient drip irrigation system.Calculations were done for three scenarios: typical irrigation water use for a traditional Southern California landscape, as-designed irrigation water use for the site, and actual irrigation water use for the site. The performance benefit only compares irrigation water use of a traditional landscape Frontier Project LPS Methodology
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