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2.04.7 Hydrology Description <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 Table 4.2iii. <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 />At the East Salt Creek upstream monitoring station, SW -01, for the period <br />of record fourth quarter 2007 to the fourth quarter of 2011, the maximum <br />recorded flow was 7.1 cfs. At the East Salt Creek downstream monitoring <br />station for the same period of record, the maximum recorded flow was 7.1 <br />cfs. Flow rates are taken quarterly, typically during March, June, <br />September and November. East Salt Creek may experience higher flows <br />during April or May that are not included in the recorded data. <br />(b) (ii) (A through G) <br />Water quality data identifying seasonal variations are presented in this <br />section and in Table 4.2iii. <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 />Total dissolved solids and electro -conductivity diminish as functions of <br />peak flows due to the diluting effect of run-off events. The pH values or <br />acidity of surface waters usually remain stable during peak flows and <br />either increase during low flow due to increased concentrations of caliche <br />derived soluble material, or decrease due to higher concentrations of <br />humic material, depending upon vegetation influences on the drainage <br />basin. <br />PR -02 2.04-26 03/13 <br />