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OURaY SILVER MINES <br /> Return Period: 10-Year 24-hours <br /> Rainfall, P: 2.60 in <br /> Q= runoff rate (cubic feet per second) =CIA <br /> C= Rational Method runoff coefficient=0.18 <br /> 1 = rainfall intensity(inches per hour)=0.108 <br /> A=drainage area (acres) =0.5 acres <br /> D=storm duration (hours)= 24 hours <br /> Q= (0.18) (0.108)(0.5)=0.00972 CFS=4.36 GPM <br /> The Governor Basin Collection Ditch will be constructed in the Spring of 2022 when weather conditions <br /> allow access to the area.A ditch will be created that will redirect stormwater from the raise bore area <br /> and divert it to a natural drainage to the side of the historic waste piles. <br /> APPENDIX - B MAPS <br /> Stormwater Management Plan 17 1 P a g e <br />