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2.04.7 Hydrology Description <br />Flows are high during the peak of the irrigation season and are low during <br />the winter. High flows would also occur as a response to intense <br />precipitation events. <br />Loma Drain as the name implies drains the area surrounding the town of <br />Loma. The Loma Drain primarily handles return irrigation flow, <br />groundwater induced by irrigation and precipitation run -off. Flows are <br />high during the peak of the irrigation season and are low during the winter. <br />High flows would also occur as a response to intense precipitation events. <br />(b)(i) Minimum, maximum, and average flow data identifying seasonal variations <br />of low flow and peak discharge rates of streams are presented in this <br />section and in Volume I, Exhibit 3. <br />Generally, seasonal variations in stream discharge shows peak rates in <br />late spring and early summer (April- July). Low flows begin in October and <br />end in March. Daily peak flows are typically around 12 midnight and low <br />flows are around 12 noon, due to snowmelt. <br />Historically, there have been three notable floods along the Colorado <br />River in the vicinity of the Loadout. According to the USGS, June 2 -17 <br />1921 a 25 -50 year event occurred. June 24 -28, 1983 a 50 -100 year <br />event. And in May and June 1984 a 50 -100 year event occurred. Peak <br />discharges for this flood were the maximum of record for the Colorado <br />River near Cameo on May 26. All three flooding events were likely the <br />result of snowmelt in conjunction with a precipitation event. <br />(b) (ii) (A through G) <br />Water quality data identifying seasonal variations are presented in this <br />section and Volume I, Tab 3. <br />Generally, seasonal variations in water quality are functions of flow rates. <br />Total suspended solids and flow peaks coincide due to the erosional <br />nature of run -off due to snow melt events. <br />Permit Application 2.0419 12111 <br />