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Cooley Smiles Dental Clinic 17318.20 October 18,2017 ; <br /> Drainage Report Section IV,Page 8 <br /> 2 year 0.010439 <br /> 5 year 0.015452 <br /> 10 year 0. 018883 <br /> 25 year 0. 02331 <br /> 50 year 0. 026658 <br /> 100 year 0.030043 <br /> Flow Frequency Return Periods for Mitigated. POC #1 <br /> Return Period Flow(cfs) <br /> 2 year 0 <br /> 5 year 0 <br /> 10 year 0 <br /> 25 year 0 <br /> 50 year 0 <br /> 100 year 0 <br /> Stream Protection Duration <br /> Annual Peaks for Predeveloped and Mitigated. POC #1 <br /> Year Predeveloped Mitigated <br /> 1949 0.006 0.000 <br /> 1950 0.012 0.000 <br /> 1951 0.009 0.000 <br /> 1952 0.007 0.000 <br /> 1953 0.006 0.000 <br /> 1954 0.023 0.000 <br /> 1955 0.016 0.000 <br /> 1956 0.014 0.000 <br /> 1957 0.015 0.000 <br /> 1958 0.010 0.000 <br /> 1959 0.011 0.000 <br /> 1960 0.010 0.000 <br /> 1961 0.010 0.023 <br /> 1962 0.009 0.000 <br /> 1963 0.011 0.000 <br /> 1964 0.009 0.000 <br /> 1965 0.010 0.000 <br /> 1966 0.006 0.000 <br /> 1967 0.013 0.000 <br /> 1968 0.015 0.000 <br /> 1969 0.011 0.000 <br /> 1970 0.008 0.000 <br /> 1971 0.011 0.000 <br /> 1972 0.010 0.000 <br /> 1973 0.008 0.000 <br /> 1974 0.014 0.000 <br /> 1975 0.008 0.000 <br /> 1976 0.008 0.000 <br /> 1977 0.007 0.000 <br /> 1978 0.008 0.000 <br /> 1979 0.015 0.000 <br /> 1980 0.009 0.000 <br /> 1981 0.008 0.000 <br /> 1982 0.010 0.000 <br /> 1983 0.014 0.000 <br /> 1984 0.010 0.000 <br /> 250 4th Avenue South,Suite 200 <br /> 0 Edmonds,WA 98020 <br /> ENGINEERING ph.425.778.8500 I f.425.778.5536 <br /> www.cgengineering.com <br />