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Existing Site Hydrology <br /> Total Site Area: 0.03 ac (Area of disturbance only) <br /> Hydrologic Soils Group C (Till) • <br /> Impervious Area: 0.00 ac <br /> Pervious Area 0.03 ac (lawn) <br /> Existing Condition Event Output: WWHM <br /> Peak Flow (cfs) Area (ac) <br /> 2-yr current 0.003 0.03 <br /> 10-yr current 0.007 0.03 <br /> 100-yr current 0.017 0.03 <br /> Developed Site Hydrology <br /> Developed Area: 0.03 ac <br /> Hydrologic Soils Group C (Till) <br /> impervious Area: 0.01 ac (roof to infiltration/dispersion trench) <br /> Pervious Area 0.02 ac (lawn) <br /> Developed Condition Event Output: WWHM3 <br /> Peak Flow (cfs) Area (ac) <br /> 2-yr mitigated 0.003 0.138 <br /> 10-yr mitigated 0.007 0.138 <br /> '100-yr mitigated 0.013 0.138 <br /> As shown in the tables above, this project proposes matching, or a net decrease in site <br /> runoff in the 2 through 100-year storm events. Therefore, the flow control performance <br /> standard has been met. <br /> Lalone Addition 20-0902 <br /> October 2020 Page 12 <br />