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~'. I I " I I I I I I . I I I I I I I , I Year 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1975 1976 1977 Peak flow Avalanche Gage 2270 2620 1410 2240 2780 1250 2580 2690 1930 1980 2140 2080 2980 2580 1910 1730 Peak flow Placita Gage 1500 1680 1260 1490 1710 940 1670 1880 1460 1690 1940 1630 1930 1820 1540 929 Avalanche Gage Adjusted* to Placita drainage area 1596 1842 991 1574 1954 879 1813 1891 1357 1392 1504 1462 2095 1813 1343 1216 avg.= avg.= Drainage Area Avalanche Gage = 167 square miles Drainage Area Placita Gage = 107 square miles *Adjustment based on TM-1, CWCS: Qt(u) = (Au/Ag)^.79*Qt(g) % difference 6 10 -21 6 14 -7 9 1 -7 -18 -22 -10 9 o -13 31 -0.88 11.50% over 16 years each year The results indicate that over the 16-year period of record, the Avalanche Creek Gage adjusted to the Placita Gage exceeded the Placita Gage discharge 9 times and was lower than the Placita Gage discharge 7 times, averaging a percent diference each year of 11.5 % However, comparing the entire 16-year period, the average peak discharge varied less than 1 % from the determined gage records at Placita. Therefore it was determined that the comparison was reasonable and the Placita Gage records could be extended using the Avalanche Creek gage records adjusted to the Placita Gage.