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mid-April) flow ranges from 0.034 up to 1.03 cfs. <br />Site SW-N3 is located on Tuttle Draw downstream of mining as shown on Map 2.04.7-1A. <br />Discharge measurements have routinely been collected from this site since April, 1980. Flow at <br />SW-N3 is artificially controlled for the most part of the year from irrigation return flow from the lower <br />Second Park lateral irrigation ditch. During the irrigation season, a significant portion of the flow at <br />SW-N3 is contributed by the NPDES 001 pond located just upstream of SW-N3 on the West Return <br />Ditch (see Map 2.04.7-1A). Measured discharge at Site SW-N3 range from 0.019 cfs up to 9.35 cfs <br />(see Table 7-40). During the irrigation season, the means of measured discharge range between <br />about 0.5 cfs and 4.67 cfs. Measured high flows for this period range between 0.665 (April) and <br />9.35 cfs (September). During the non-irrigation season, discharge measurements ranged between <br />0.019 and 2.09 cfs. It should be stressed that discharge measurements at different surface water <br />monitoring sites were not necessarily collected on the same day. Measured high and low flows <br />previously and subsequently discussed for up- and downstream sites established in one drainage <br />may not reflect "same-day" measurements. <br />2.04.7-34