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Base on the attached calculations the anticipated runoffs of the post-development are: <br />Area <br />A <br /> Section I: Project Description <br />The project site consists of approximately 2,328sf on total area of the lot. <br />The existing site is currently developed with a one story main house, a two-car garage, and <br />concrete flatwork (driveways, walks, etc.) that will require no disturbance. <br />The proposed ADU: <br /> •ADU: 799 sf with entry (53 sf). <br />Concrete walkway: 176 sf. and concrete driveway: 248 sf. <br />Landscape: 1,052 sf. <br />Storm water drains from the right to the left (East to West) to Maxine St. and then South along <br />Maxine St. to the public storm drain systems. <br /> •Area A (total area): storm water drains along the concrete walkway and the grassy swale, then <br />discharges to Maxine St. via overflow device. <br />This report is to determine the runoff for 100 storm frequency. <br />Acres <br />0.053 <br />Q10 (cfs) <br />0.17 <br />Q25 (cfs) <br />0.21 <br />Q100 (cfs) <br />0.27 <br />Page 3 of 8