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Standard Form SF -2 -- Rational Method Procedure — Storm Drainage System Design <br />Canyon Dolomite - Old Quarry <br />Calculated by John Jankousky Revision 5/29/2015 <br />DESIGN STORM: 10 -YR <br />DIRECT RUNOFF TOTAL RUNOFF STREET <br />IPIPE <br />TRAVEL TIME <br />U <br />U <br />c ._ C <br />- z _ <br />d ' UU ... Q o .2 <br />_ a - <br />m ¢ m E <br />y s d <br />u) a m o v O ..,- O m in <br />LL <br />y <br />o <br />REMARKS <br />o r.i >. <br />L <br />s Q <br />m o- <br />1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 <br />16 <br />17 18 19 20 21 22 <br />1 Quarry -outlet Qua" outlet 33.70 0.28 16.2 9.55 3.10 29.62 <br />FORMULA: Q= C i A (Q is flow in ds; C is runoff coefficient (dimless), i is rainfall intensity in inches/hr (based on t ,); A is area in acres, <br />Velocity in pipe estimated by V = (1 49/0.013) x ((Diameter(inchesy(12'4))^0 667) x ((Slope(%y100)^0.5), Travel time, T, <br />= Length <br />(ft) / Velocity (fps) /(60 sec/min) <br />Velocity in street flow estimated from Figure RO-1, Travel time, T, = Length (ff) / Velocity (fps) /(60 sec/min) <br />Page A-9 hydrology--Canyon-Dolomite-RevO-May2015 xlsx Rational-10YR <br />