4. (10 marks) Given a flow of 100 cfs in a rectangle channel with 6 ft....
An 8 ft. wide and 1000 ft. long prismatic rectangular channel is carrying a flow of 13 cfs. The channel has a slope of 0.001 ft/ft and Manning's n is 0.035. The depth of water in the channel is 1.25 ft. a. Another engineer computed the normal depth in the channel to be 1.25 ft, which is the existing depth of flow. Check that computation to see if it correct (show all work) b. Compute the critical depth of flow in the...
A 12-ft-wide rectangular channel conveys 3,030 cfs. Determine the normal and critical depths for the concrete channel (1% slope). Also determine the flow classification (critical, supercritical, or subcritical) when the channel flows at normal depth.
2. Find the normal depth for the 100-year-flood in the Magpie Creek Diversion Channel, which is shown below. The channel is trapezoidal with a base width of 15 ft, side slopes of 1H:1V (m=1), slope of 0.0028 and Manning's n of 0.015. The 100-year-flood flow has been estimated to be 1020 cfs. Is the normal depth subcritical or supercritical if the critical depth is 6.6 feet?
Problem 6. A circular conduit carries 400 cfs when the flow velocity is 10 ft/s at half-full. a. What is the necessary fall per mile using a Manning's n 0.020? Will the flow be subcritical or supercritical? b. Calculate the flow rate when critical depth occurs at half-full.
Problem #3 A rectangular channel is 25 ft wide and has a flow of 500 cfs at the velocity of 5 ft/sec a) Determine the specific energy of water in the channel b) What is the critical depth of flow in the channel c) What is the critical velocity
A trapezoidal channel to be excavated into the ground will be sized to carry Q-200 cfs at normal flow. The bottom slope is So 0.0004 and the Manning roughness factor is n= 0.020. The land surface also has a slope of 0.0004. If cost of excavation is the main concern, which of the alternatives listed below is the best? Neglect free board. b (ft) 10 10 10 rn 1.5 2.0 2.5
Supercritical, uniform flow of water occurs in a 5.0 m wide, rectangular, horizontal channel. The depth of flow is 1.5 m and the flowrate is 45 cu.m/s. The flow encounters a 0.25 m rise in the channel bottom. What is the new normal depth? Is the flow after the rise subcritical, critical or supercritical? Assume frictionless flow
= 1. (20) A roadside channel (n 0.02) carries a uniform flow of 0.4 m3/sec with a bed slope of 0.009. The channel itself is triangular in shape with side slope z = 1.73. Answer the following. a. (8) What is the normal depth? b. (7) What is the critical depth? C. (5) Is the flow subcritical or supercritical?
4. Given: Discharge = 125 cfs; upstream bottom width = 8 ft; upstream flow depth = 0.5 ft; downstream bottom width = 12 ft; downstream flow depth = 4 ft; length of transition = 50 ft. Design a supercritical channel transition without hydraulic jump.
('15 Marks) Question 4 An earth drainage ditch may be approximated a trapezoidal channel has a base width b = 6 m and side slopes 1H:1V. The channel bottom slope is So = 0.0002 and the Manning roughness coefficient is n = 0.014. Compute a) the depth of uniform flow if Q = 6.01 m/s b) the state of flow (25 Marks) Chapter 8 Question 5 brick channel designed to carry 5.5