A) A rectangular channel flowing normally rull at a depth 1.40 m has base of width 2 m. The flow rate is 3.6 m³/s. It is to be replaced by an efficient rectangular section with the same material and adhering to the same slope. (a) What is the increase in its capacity? (b) If instead the most efficient trapezoidal section were used, what would be the increase in the flow rate? (c) What percent increase could have been expected if the most efficient of all efficient sections were used?

A) A rectangular channel flowing normally rull at a depth 1.40 m has base of width 2 m. The flow rate is 3.6 m³/s. It is to be replaced by an efficient rectangular section with the same material and adhering to the same slope. (a) What is the increase in its capacity? (b) If instead the most efficient trapezoidal section were used, what would be the increase in the flow rate? (c) What percent increase could have been expected if the most efficient of all efficient sections were used?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The incoming flow rate is 200 m3/s on a rectangular channel with: depth = 3 meters width = 4 meters Then, a hydraulic jump occurred along the way. Determine the depth at the hydraulic jump section.
the incoming flow rate is 100m3/s on a rectangular channel with: depth = 3m width = 4 meters Then, a hydraulic jump occurred along the way. Determine the depth at the hydraulic jump section.
A flow of 30 m3 /s occurs in a trapezoidal channel having a base width of 3 m, side slopes 1 vertical to 2 horizontal. Determine the critical depth, yc.
A uniform flow occurs in a 4.1m diameter circular concrete culvert, but the depth changes depending on the weather (due to storms). The Manning coefficient is n = 0.013, and the channel slope is So = 0.0003. What is the discharge in m3/s when the depth of flow is 3.5m?
A hydraulic jump occurs in a trapezoidal channel with side slopes of 1:1 and base of 4 m. If the upstream depth before the jump is 1.0 m and the downstream depth is 2 m. Determine the discharge in cu.m./s (2 decimal places)
The rectangular diversion channel is originally designed to have a width, B, of 12 m and depth, Y, of 2 m which is lined with concrete that has a roughness of 0.021. The distance from the city to the bay is around 8 km with a difference in elevation of 20 m. However, due to limited budget, it is proposed that the original design of the diversion channel be modified into most efficient rectangular hydraulic section. Knowing that the most efficient rectangular section is the one with a depth equal to half of its width or Y= 0.5B, determine the (a) new dimensions, Y and B of the modified rectangular channel and compute the total savings in (b) excavation cost, (c) land acquisition cost, and (d) concreting cost if the modified design is to be implemented but adhering to same discharge capacity. The unit cost of excavation is 400 per cubic meter, cost of the land is 1,500 per square meter, and concreting cost is 300 per square meter of lining.
A trapezoidal channel of 2.0m bed width and 3:2 side slope carries a discharge of 10m3/sec with a depth of flow of 0.5m. Determine whether the flow is supercritical or subcritical. If hydraulic jump where to form. what would be its height and efficiency. Assume mannings coefficient n = 0.025
There is a rectangular channel that will be excavated downstream of a dam after a stilling basin both with a width of 15 meters. The depth of the wather flow upstream of the dam is 4.27 meters and the discharge flow above the dam is 112.5 cubic meters per second. the channel wil be excavated in earth and n = .o25 and maintains a uniform flow depth under a subcritical flow regime. I need to determine 1. the bottom channel slope needed in the downstream channel and 2. the length of the stilling basin if the dissipation stucture starts at dissipated along the structure. The design should consider that the flow depth at the end of the still basin is similar to the flow depth in the channel. For a more realistic approach in the design, the head loss between the station upstream of the dam and the station at the beginning of the still basin is 10% of the velocity head observed at the beginning of the basin
A rectangular channel 6 m wide has 1.50 m depth of water flowing with a mean velocity of 0.75 m/s. a standard sharp-crested weir increases the depth in the channel approach to 2.50 m. when the flow in the channel is 6.75 m³/s and considering the velocity of approach, find the height of the weir.
A rectangular, sharp-crested steel weir 20 m long and 3.8 m high is installed to an open channel that has a depth of water 5 m high. Neglect velocity of approach. (a) Determine the discharge in m³/s. (b) Determine the discharge in m³/s if the rectangular weir have end contractions. (c) To attain a discharge of 12.34 m³/s, what height of Cipolletti steel weir plate is required in meter with the same crest length?
discharge = 6.5 m^3/sec Considering the best hydraulic cross-section, what is the critical depth of this trapezoid-shaped channel? Best cross-section: T (top-width)= 2z (side length) R = y/2
An unsymmetrical trapezoidal channel with one side inclined from horizontal by 35 degree and the other inclined from vertical by 40degree is to be designed to carry a 2.0 cubic meters per second discharge. Determine the dimensions of the channel for most efficient section if roughness coefficient is 0.030 and average longitudinal slope is 0.05. Draw the cross section of the open channel considering the freeboard height. Use Chezy and Kutter’s C formula.