Mortality of Rock Goldenrod in Sagebrush Stands Sprayed with 2,4-D

design of pump lines for any given pipe size (providing the pipe would withstand pressure created) any given quantity of water may be pumped through the line by increasing or decreasing the power applied to the pump. Therefore, it may be readily seen (Fig. 5) that the maximum pressure on a pump line normally occurs at the pump or at a lower point in elevation along the pipe relatively near the pump. For an example, using Fig. 5, assume the need to deliver 10 gpm to 50f 00 through a 1.5-inch line. The elevation difference between Of 00 and the water surface in the tank at 50f 00 is 175.0 ft. The friction ,loss in the 1.5inch pipe flowing 10 gpm would be 8.6 ft/l,OOO or 43.0 ft total for the 5,000 ft of pipe. Neglecting minor losses, the total head would equal the elevation difference plus friction loss, or 218.0 ft at O-!-00. On gravity and pump lines, the maximum pressure on any segment of the line should be checked. The maximum pressure occurs where the hydraulic gradient or the static head is a maximum distance above the center line of the pipe. This head in feet is easily converted to pressure in lb/in2 (P) . P=62.4 X Head in ft