Diameter/Geometry Clause Samples

Diameter/Geometry. The bypass pipe diameter or open channel bypass geometry should generally be a function of the bypass flow and slope, and should be chosen based on achieving the velocity and depth criteria in Sections 11.9.3.8 and 11.9.3.9. Table 11-1 provides examples for selecting the diameter of a bypass pipe based on diverted flow amount, assuming 1) bypass pipe slope of 1.3%; 2) ▇▇▇▇▇▇▇’▇ roughness of 0.009; and 3) other bypass pipe criteria (Section 11.9) are met. Bypass pipe hydraulics should be calculated for a given design to determine a suitable pipe diameter if the design deviates from the assumptions used to calculate pipe diameters in Table 11-1. < 6 5% of diverted flow 10 2 ½ 6 - 25 5% of diverted flow 10 4 40 2.00 12 4 ¾ 75 3.75 15 6 125 6.25 18 7 ¼ 175 8.75 21 8 ½ 250 12.5 24 9 ½ 500 25.0 30 12 750 37.5 36 14 > 1000 design with direct NMFS engineering involvement
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