a 3m wide horizontal rectangular channel is narrowed to a width of 1.5m to cause critical flow in the contracted section if the depth in contracted section is 0.8m. calculate the discharge in the channel and the possible depth of flow and corresponding froude numbers in 3m wide section neglect energy loss in the transition

A most efficient rectangular section and triangular section have same value of Manning's n and bed slope. If both the sections have same cross-sectional area, then the ratio of discharge for given rectangular and triangular sections is.

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A 7350 m long, 1050 mm concrete pipeline connects an upstream reservoir (watersurface elevation 433.3 m) to a downstream reservoir (water surface elevation 423.1 m). Adischarge valve at the downstream end is used to control flow; when this valve is fully open,the measured discharge in the pipeline is 920 L/s under the naturally available head difference.(a) Assuming fully developed turbulent flow and that all other local losses are negligible,estimate the loss coefficient k for the fully open valve (assume f = 0.015).(b) Because of increasing urban development, the flow under the natural head difference isconsidered to be inadequate and it is proposed to increase this flow with pumping. The head-capacity curve for the pump can be approximated by the equation H = 8 – 3.5Q2 in which H isthe total dynamic head on the pump (in m) and Q is the discharge (in m3/s). What is thedischarge that can now be obtained from the system where the pump is installed at a cross-section of the pipeline?

5. In rectangular channel at a section P, it is required that the depth of flow is to be 1.4 m and the specific energy to be 2.8 m. The flow at section P is subcritical, critical, or supercritical flow? 10%

A rectangular channel has a width of 2.0 m and carries a flow of 3.0 cms. If the depth of flow at a section is 0.35 m, calculate 1) Specific energy at that section, 2) flow depth alternative to the existing depth, 3) Froude number at the alternative depth, and 4) critical depth. Ans: (hint: consider C.E and S.E.)

Water is discharged under a sluice gate at a rate of 75 m3 /s into a frictionless, horizontal, rectangular channel, 6 m wide. The depth just downstream of the gate is 1.25 m. Determine the depth just upstream of the gate opening The Froude number upstream and downstream of the sluice gate

The top width and the depth of flow in a triangular channel were measured as 5 m and 1 m respectively. The measured velocity on the centre line of flow area at the water surface, 0.2 m and 0.8 m below the surface are 0.8 m/s, 0.6 m/s and 0.5 m/s respectively. Using two point method of velocity measurement, the discharge (in m3/s) in the channel is

Water flows in a horizontal, rectangular channel initially 10 feet wide and 2 feet deep. The initial velocity is 6 ft/s. This flow encounters downstream a simultaneous downward step and constriction. No energy losses are associated with these changes in channel configuration. a. What is the specific discharge, q: i. Upstream (for w= 10 feet)? ii. Downstream (for w = 6 feet)? b. What specific energy, E, is associated with the flow as initially specified (at the upstream location)? c. What is the minimum energy needed to pass the full discharge at the downstream location? d. What is the height (Az) of the smallest downward step necessary for the upstream flow conditions to remain as specified?

B-calculate the specific energy in trapezoidal channel which has a bottom width of (loft) and side slope (1:1) the rate of flows (180ff/ at depth (3ft) sec