Provide 90o angle V-notch on both side of launders, weir
loading rate14,000 gpd/ft at Qp
Figure 14. (a) Single weir and trough (b) Multiple weirs and troughs with outlet channel
at the middle (c) Double weir and trough (d) Multiple weirs and troughs with outlet
channel at the side.
Figure 15. Effluent launders discharging into an outlet channel.
Weir length per tank
Number of launders: Convey launder width = 2.5 ft,
Tank width = 25 ft,
Number of V-notch weir: At peak flow, width of
V-notch = 8"
Discharge q and hydraulic head over one V-notch(1)
One tank service at Qp=10 mgd,
Two tanks service at Qp=10 mgd, or one
tank for QA,d=5.0 mgd
Two tanks service at QA,d=5.0 mgd
All of which fit the design standard well.
5.Dimension of launder of V-notch
Figue 15. Water surface profile in the effluent launder(Dimesions don't apply).
Width of launders, b=1';
y1 is depth of the luanders;
Space between any two launders = 2';
The flow profile in launders is parabolic curve;
y2 = the water depth at the end of launder, Select y2 = 2';
n = Number of V-notch per launder/2;
l = Width of tank/2;
q = flowrate per V-notch;
(1). Open Channel Hydraulics, page 352, Richard H. French
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