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The summer precipitation comes primarily in the form of afternoon <br />rain showers. Daily precipitation seldom exceeds one inch and <br />none of the eight stations in the area have recorded a major thunder-' <br />storm producing two or more inches of rain during the past five years. <br />There are reported instances, however, of general rainstorms with <br />total cloud cover and rain continuing throughout the area for more <br />than one full day. These rainstorms occur primarily in the months <br />of June and early July. <br />d. Evaporation <br />Evaporation data is not yet available for the Seneca 2-W area and <br />only a small amount of data is available from the Hayden Station, <br />as shown in Table III-4. With such a short recording time available, <br />these values must be taken as indicating an expected range only and <br />not as being representative. <br />EVAPORATION/PRECIPITATION DATA COLLECTED NEAR <br /> HAYDEN STATION <br /> ,~~1 Total <br /> Evaporation Precipitation <br />Month (in.) (in.) <br />September, 1971 5.92 1,02 <br />May, 1972 5.66 0.49 <br />June, 1972 7.14 0.25 <br />July, 1972 8.83 0.99 <br />August, 1972 8.03 1.15 <br /> <br />September, 1972 <br />6.30 • <br />1.14 <br />October, 1972 6,17 3.46 <br />The amount of evaporation is determined primarily by ambient air <br />temperature, relative humidity, the amount of cloud cover present <br />and air flow patterns. In each month for which values were recorded, <br />evaporation exceeded precipitation by 2,5 to 8 inches per month. <br />This type of evaporation/precipitation pattern is common in many <br />western azeas where the amount of precipitation is not sufficient <br />to replace soil moisture lost to evaporation. <br />e. Other Climatological Factors <br />Seneca 2-W is located in an area of relatively low humidity. (mean daily <br />maximum). Average relative humidity at historical reference points <br />cIo§e to the Seneca 2-W area seldom have exceeded 70 to 75. percent, with <br />an average of about 55 percent. The area is also characterized by a <br />large number of days of sunshine." <br />Storm runoff in the Seneca 2-W Report for area BSW RS/6LI shows a <br />10 yr frequency of 1.4", 1.6" for a 25 year period and 1.8" for a <br />50-yr. period of occurrence (6 hr. period). <br />• <br />-6- <br />