2006-06-02_PERMIT FILE - C1980007A (5)

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Erxat/,~ Hubbard Creek Drainage. The mean monthly precipitation and annual mean precipitation data for the 12 to 13 years before 1954 are cnmmari~rrt graphically in Exhibit 23. The average annual precipitation received at the Wilcox Ranch was 16.94 inches. Greatest average precipitation was recorded in April (2.08 inches) and the least in September (0.85 inches). The maximum monthly precipitation fell during April (4.52 inches), with June (4.15 inches) and January (4.02 inches) recording similar max;ma Even October (3.90 inches) and August (3.82 inches) have recorded substantial amounts of precipitation. November had the lowest maximum recorded Precipitation patterns are not obvious for the area Precipitation has been lowest between May and November, especially between June and October, yet considerable precipitation has fallen during each of these months in one year or another. All months but November have received more than two inches at least in some y ears. Precipitation during April and June was most variable; the range between the maximum and minimum precipitation values spans 4.08 and 4.12 inches, respectively. January, August, and October varied more than 3.5 inches between the maximum and minimum values (U.S. Department of Commence, N.O.A.A. Environmental Data Service). Paonia Stations Precipitation values for the Paonia Stations are more complete than those for Wilcox Ranch (McKee, 1975). Monthly precipitation values, based on 51-53 years of data up to 1957 from the Paonia 3 SE station, are c~m,mari~rrt graphically in Exhibit 23. An average of 15.75 inches of precipitation is received yearly here. Highest average precipitation typically occurs in April (1.66 inches), and lowest in June (0.73 inches). The maximum monthly precipitation fell in March (6.40 inches). January received 4.38 inches in one year. February, April, May, June, August, September, October, and November all have received more than 3.3 inches of precipitation The maximum precipitation recorded for July (1.97 inches) is noticeably lower than the next lowest recorded maximum (2.88 inches in December). The minimum monthly precipitation fell during May, June, September, and October (all 0.00 inches). March (0.06 inches), November (0.08 inches), and December (0.09 inches) may also receive relatively low amounts of precipitation April has always had a minimum precipitation greater than that of any other month No clear pattern of precipitation distribution emerges for this station either. Only June and July are noticeably lower than the other months for average precipitation, yet June received 3.35 inches one year. March and January have the widest range between their maximum and minimum values. However, the range of values is above 3.5 inches for May, August, October, and November. It is above 3.2 inches for February, April, June, and September. Only July and December have precipitation ranges less than 2.8 inches. The most recent precipitation summary for the Paonia station is based on data from 15-16 years before and including 1972 (McKee, 1975). Data for this period are also gLmmari~erl graphically in 2.04-//8 I/94IR05; 8/94 rR7l; 6N5 PR06; 4fmch 2006 PRIG