Laserfiche WebLink
01 <br />city Ot!ildinq Inspection i)epartment <br />sapten,ber 21. 1979 <br />Page 5 <br />0!rtlot PlPie <br />oiamater 6" <br />Slope Approx. 10' in 250' - 4.(YK <br />Capacity = .0 (•5)8/3(.04)1/2 . 1.2 CPS <br />.84(l.b 23 905 - .74 C 1.2 CPS <br />I•)rt Development capacity ) ( , 60) <br />6" !)in. O.K. <br />Retention/Detection System #3 <br />24" n1a. Cone. Pipe Otwn 2 Catch aasine 0 84'-0" o.c. <br />V (12.57)(3) <br />W 38 <br />CPT <br />Catch naein #4 <br />v _ (12.57)(4.66) <br />a 59 <br />CFT <br />Catch naein it, <br />v a 3.1415(70) <br />- 251 <br />CFT <br />24" Conr. Pir, do' tong <br />V Total <br />348 <br />CFT > <br />341 CFT <br />nETENTloN RL-rUL ION SYSTEM #4 @ GYMNASIUM <br />Pre usvelopment Areas: <br />2,354 eq.ft. Vacant Area Dirt s ,rase C - .6 <br />1,819 Gravel c - .7 <br />21,609 Paving or Concrete C _ .95 <br />25.782 sq.ft. Total Effective C .9 <br />poet nevelopment Areae: <br />25,782 sq.ft. ?aving, conc. walks or roof <br />resign Storm: <br />Pre Development frequency <br />Poet Development frequency <br />Intensity Pre Da velopment <br />intensity Post Develupment <br />nuration <br />pre zevelopment resign Runoff: <br />90( 3)(17) 25,782 - .90(931) - 830 CPT <br />c = .95 <br />1 in 10 years <br />1 in 25 fears <br />1.3 in./hr. <br />1.6 in./hr. <br />20 minutes <br />Post tnevelopmenl Design Runoff; <br />.95(�)(17) 25,782 - .95(1,146) = 1,088.5 CPT <br />Runoff uifferential = 256 CPT <br />j <br />