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<br />Mr. Gregg Squire <br />Division of Minerals and Geology <br />August 25, 1995 <br />Page 3 <br />4. Water Information <br />C. The culvert under County Road #36 is 24 inches in diameter. The following is a <br />summary of the expected maximum flows through this culvert. <br />1) Connell expects to pump at a maximum rate 600 gpm, when the mining first intercepts <br />the groundwater table. They expect an average pumping rate of 250 gpm. <br />2) The water pumped from Western Mobile's operation flows down the irrigation ditch <br />on the east side of the Wellington Downs property: The imgation ditch Ts in an east- <br />west direction on the south end of the property. The eastbound irrigation ditch drains into <br />a 24 inch culvert under I-25. The westbound irrigation ditch connects with the culvert <br />under County Road 36. <br />Since Western Mobile has been dewatering at their mining operation for some time, we <br />will assume they are pumping the same average rate as Connell (250 gpm). In addition, <br />we will assume there is no loss due to infiltration, but half of the flow is diverted to the <br />east irrigation ditch. Thus, there would be an additional 125 gpm of flow into the County <br />Road 36 culvert. <br />3) At the most there will be azound 80 acres of land available for irrigation. The amount <br />of available farming land will shrink as mining progresses. <br />Assuming the following: a) total depth of imgation for the season (150 growing days) is <br />three feet, half (1.5 feet) of this will be lost due to plant consumption and one foot of <br />water would be lost to i~ltration. So, one half foot of irrigation water would drain from <br />the 80 acre irrigation site over the period of the 150 day growing season. Converting this <br />into gpm yields 60 gpm. <br />SUMMARY OF MAXIMUM FLOW 1N CULVERT <br />Culvert Flow <br />Contributions Gallons Per Miuute <br />(GPM) <br />1) Wellington Downs <br />Pit 600 <br />2) Western Mobile <br />Pit l25 <br />3) Irrigation 60 <br />TOTAL: 785 <br /> <br />