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Report (3) 5 99- CZCI Z-- .%, J. H. Sigmund Consulting Engineer, Inc. i Civil Engineering Land Surveying 8835 S.W. Canyon Ln., Suite 402 "' phone (503) 292 -5825 Portland, OR 97225 fax (503) 291 -1613 OC NELCO INC. STORM DRAI \AGE REPORT FOR KNHS WAREHOUSE ON _ TL 1200 TM 2S1 12AC CITY OF TIGARD, OREGON CITY OF TIGARD FILE #: SDR 98 -0019 April 30, 1999 + G „ � ` �' 14,057 ' \.', 1 • \ /- ' / V- G s N, S %C�`�� p e i' q5c)/cED. /% 92o/201 SUMMER STORM CALCULATION * * * * * * * * * * * * * * * * * * ** S.C.S. TYPE -IA DISTRIBUTION * * * * * * * * * * * * * * * * * * ** * * * * * * * ** 1 -YEAR 4 -HOUR STORM * * ** .36" TOTAL PRECIP. * * * * * * * ** ENTER: A(PERV), CN(PERV), A(IMPERV), CN(IMPERV), TC FOR BASIN NO. 1 0,95.3,1.52,95.3,1 DATA PRINT -OUT: AREA(ACRES) PERVIOUS IMPERVIOUS TC(MINUTES) Ap CNp Ai CNi TC 1.5 .0 98.8 1.5 98.8 1.0 PEAK - Q(CFS) T- PEAK(HRS) VOL(CU -FT) .35 .77 635 THE PEAK -Q FOR SUMMER STORM EVENT IS 0.35 CFS. USE 4.0' WIDE, 125.0' LONG @ S = 0.010 WATER QUALITY SWALE FOR TREAMENT. THE HYDRAULIC RESIDENCE TIME IS 9.13 MINUTES (SEE CALCULATION ON PAGE 2 & 3). / �9