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FLAMEBURGER RESTAURANT DRAINAGE SUMMARY <br />Assumptions <br />1) Drainage considerations based on ultimate development of Lots 1, 2, <br />3, 4 and 5 of Townbridge Addition - includes proposed Hoggsbreath <br />parking area and multi - residential development of Lots 4 and 5 (see <br />attached). Also provides for road surface. <br />2) Drainage requirements are split into two sections: the first sec- <br />tion draining to the west end of the drive which will serve the <br />Flameburger Restaurant, and the second section being that draining <br />to Demont right of way on the east edge of Lot 5. <br />3) Qpeak based on Rational Method Q = CIA <br />4) No ponding available <br />* Section 6) (to Flameburger entrance x -ing) <br />Drainage Areas <br />1) Paved, building or sidewalk area (impervious) = 1.41 acres <br />Assume C = 0.90 <br />2) Grass and vegetated area = 0.45 acres <br />Assume C = 0.30 <br />L = 500 feet via ditch <br />S 4'/500 = 0.008 ft /ft <br />N = 0.20 I = 4.0 in /hr. <br />tc = 21 min 10 <br />Qpeak = CIA = 0.90 (1.41) (4) + 0.30 (0.45) (4) = 5.6 cfs <br />* Section n (to east edge of Lot 5) <br />Drainage Areas <br />1) Paved, building or sidewalk area (impervious) = 1.69 acres <br />Assume C = 0.90 <br />2) Multi- residential = 1.05 acres <br />Assume C = 0.50 <br />3) Grass or vegetation = 0.51 acres <br />Assume Cr." 0.30 <br />Assume I10 = 4.0 (essentially same as previous - minor change not relevant) <br />Qpeak = 0.90 (1.69) (4) + 0.51 (0.30) (4) + 1.05 (0.5) (4) = 8.75 cfs <br />