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. Page'2 of 2 3�5 <br /> MILDER PAYING PAOWCTS Reid, Middleton 6 Assc:. <br /> Grsenehields Tracts Developement File No. 21-88-OOl-OG2-02 <br /> Upttrea� Dralnaqe Malysls Date: OB-Apr-88 <br /> Aatlonal Method ' <br /> RAINFALL INTENSITY SUMMARY , <br /> Surface Slope 'V' 'L' 'Tc' '1-10' '1-25' � <br /> T9ve (i) (f/s) (feet) (minutes) (In./Hr.) (In./Hr.) <br /> --------- --------- --------- --------- --------- ------- ---------- <br /> i , <br /> initial collection �p <br /> res. larn B.Bt 2.10 310 2.1 <br /> playfield 2.31 1.10 d30 6.5 <br /> forest y,�; 0.35 180 22.9 <br /> forest 36.lt 1.50 55 0.6 <br /> water eourse 2.6t 2,60 190 1,2 <br /> --------- --------- --------- --------- --------- ------- ---------- <br /> TOTAL tt95 43.9 0.9 1.03 <br /> CONDUIT SIZE SUMMARY <br /> Pipe slope required io exceed flow: ! <br /> 'Q� Return pipe dtameter: <br /> (CFS) Period 15' 18' 21' 21' <br /> • --------- --------- --------- --------- ------- ---------- <br /> > 6.39 10 years 0.9t 0.4t 0.2; p,p; <br /> > T.32 25 years 1.1� 0.51 0.21 0.2i <br /> ASSUMPTIONS <br /> 1) Roof drains are not connected to sanitary/ con�bined system. <br /> 2) Stor� drainege syste� sauth and east af Rtverdale Park not <br /> connected to sanitary/ eonbined syste�. <br /> 3) 'C' factor varies based nn terrain type and slope. <br /> l) 'Tc' caputed based an distance froa southeast corner ef basin <br /> to the exisNnq culver� under Grand Ave. <br /> Filena�e: NPGTUA I <br /> I <br />