REPORT OF INVESTIGATIONS NO. 38 27
gpd per fts. Although the pumping tests indicate that the coefficients might be quite variable, the values assigned to these coefficients are probably low. If the coefficients had been assigned greater values, a smaller drawdown beneath the waterway would have been computed.
The drawdown for two patterns of pumping was computed. The pumpage in the first pattern was divided equally among the pumps on the west, east, and south lines of wells. The pumpage in the second pattern was divided equally among the pumps on the east and south lines of wells. Figure 9 shows the drawdowns resulting from the first pattern of pumping. It was assumed that the west, east, and south lines of wells had been pumped for an infinite period at the rate of 17.4 million gallons per month or 12.6 gpm (gallons per minute) per pump. This rate equals the greatest monthly pumping rate on record (fig. 3). The maximum drawdown beneath the centerline of the waterway for these conditions was computed to be slightly more than 12 feet.
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" 58 EXPLANATION
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Figure 9. Computed drawdown along proposed waterway due to pumping 17.4 million gallons per month from the west, east, and south lines of wells of the Venice well field.