A contracted measurement weir is to be installed in a 22-ft-wide channel. The depth of the weir opening is 16 in, and the bottom of the weir opening is at elevation 479 ft. The bottom of the channel is at elevation 470 ft. For proper measurement and metering, a minimum of 6 in of hydraulic head over the weir lip is required. The average flow is 6 MGD but varies from a minimum of 3 MGD to a maximum of 12 MGD.

Develop a conceptual design for a trapezoidal concrete (Gunite, good section) channel that is sized to convey a design discharge of 50 m3 /sec. Evaluate the feasibility of constructing a channel with a bed slope of 0.005, a bed width of 3 m, and side slopes of 2:1. Determine the design flow depth. If the flow depth exceeds 2.0 m, the design will not be feasible. Comment on the feasibility of the design and, if necessary, discuss ways the channel might be modified to comply with the maximum flow depth of 2.0 m.

A 6.0 foot wide rectangular channel has a normal depth of 2.45ft  what is the cross sectional area of the flow? what is the wetted perimeter? what is the hydraulic radius?

A 30 ft wide UV treatment tank has a serpentine weir to regulate flow depth. The forks of the weir are 1.5 ft wide by 5 ft long, with 6 forks in all. If the plant flow is 800 gpm, what  is the weir loading (gpd/ft)?