Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 8, Problem 8.6P
To determine
Draw the flow net for the weir and calculate the seepage under the weir.
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How can I calculate the water level in a grit chamber at average flow and at peak hourly flow. The effluent from the tank flows over a fiberglass, sharp-crested weir that is set at elevation 136.00 ft above sea level (ASL). The average daily flow rate is 2.6 MGD. Assume that all flow must pass through one grit chamber. The dimensions of the grit chamber are 9 ft wide, 30 ft long, and 10.5 ft deep (water depth). The weir extends across the full width of the chamber.Elevation of water in grit chamber at average daily flow = ______ ASL
How can I calculate the water level in a grit chamber at average flow and at peak hourly flow. The effluent from the tank flows over a fiberglass, sharp-crested weir that is set at elevation 136.00 ft above sea level (ASL). The average daily flow rate is 2.6 MGD. Assume that all flow must pass through one grit chamber. The dimensions of the grit chamber are 9 ft wide, 30 ft long, and 10.5 ft deep (water depth). The weir extends across the full width of the chamber. Peak hourly flow rate = _____MGD
Chapter 8 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- How can I calculate the water level in a grit chamber at average flow and at peak hourly flow. The effluent from the tank flows over a fiberglass, sharp-crested weir that is set at elevation 136.00 ft above sea level (ASL). The average daily flow rate is 2.6 MGD. Assume that all flow must pass through one grit chamber. The dimensions of the grit chamber are 9 ft wide, 30 ft long, and 10.5 ft deep (water depth). The weir extends across the full width of the chamber and find the hydraulic retention time of the grit chamber. HRT at average flow = ______ minutesand HRT at peak hourly flow = ______ minutesarrow_forwardA pipe culvert 45 ft long extends between two reservoirs as shown below. The difference in the water surface elevation (Ah) between the two reservoirs is 21.7 ft. The pipe is 5.0 ft in diameter and has a friction factor of 0.04. Calculate the discharge in the pipe if the entrance loss coefficient is 0.5 and the exit loss coefficient is 1.0. L Aharrow_forwardA primary clarifier for a municipal wastewater treatment plant is to be designed for an average flow of 7570 m3/d. the regulatory agency criteria for primary clarifiers are as follows: peak overflow rate = 89.6 m3/m2.d, average overflow rate = 36.7 m3/m2d, minimum side water depth = 3 m, and peak weir loading rate = 389 m3/m.d. The ratio of peak flow to average flow = 2.75. Determine: Diameter of the sedimentation basin The length of the peripheral weir. Assume that the weir launder has a width of 50 cm (from the tank side), and the weirs are installed on one side of the launder.arrow_forward
- At one section of a 300 cm wide rectangular channel, the depth of flow is 180 cm. With a bed of 0.0020, the channel is discharging water at a rate of 3.40 m³/s. Calculate the distance to an upstream section where the depth of flow is 1.50 m. Draw and label your solution. Show the Energy grade line. Assume n = 0.015 Distance = m (round off to nearest whole number)arrow_forwardA rectangular open channel is 4m wide and has a discharge of 10 cu.m./s when the depth of flow is 2m. If the same material has been used for a trapezoidal open channel having the same wetted perimeter, what would be the most efficient discharge without changing the slope? a) Q = Blank 1 cubic meters/sec. Blank 1 Add your answerarrow_forwardUniform flow occurs in a 12-m-wide rectangular channel with a discharge of 100 m3/sec. If the normal depth of the flow is 3 m, what will be the new normal depth when the width of the channel contracts to 8 m? Neglect losses. Check your solutionarrow_forward
- Compute the hydraulic radius and hydraulic depthj for a 36 inch diameter culvert with a depth of flow of 20 inchesarrow_forwardQuestion 1 By referring to Figure 1, determine; i) ii) ii) Flow Area, A Wetted Perimeter, P Hydraulic Radius, R 1 m A3 A2 A4 2 m 2 m A1 2 m 4 m 3 m Figure 1.arrow_forwardExample 4.1 • Given a circular clarifier that is 96 feet in diameter with a sidewall water depth of 8.5 feet and a single effluent weir located along the periphery of the tank, determine the overflow rate, the detention time, and the weir loading for an average flow of 11 mgd.arrow_forward
- Q1: (a) Define and explain uniform flow. How is open channel flow different from pipe flow? (b) Under what conditions the bed slope, water surface slope and the energy line slope are equal?arrow_forwardThe head lost in 150 ml of 0.3 m pipe having sand- grain roughness projections 2.5 mm high is 12 m for a flowrate of 0.28 m^3/s. What head loss can be expected when the flowrate is 0.56 m^3/s?arrow_forwardA water treatment plant operates two circular sedimentation basins in parallel to remove suspended solids and treats a total flow of 12 mgd. Each basin is center-fed (i.e., water comes into the reactor in the middle and radiates toward the outside of the basin) and the solid-free water exits the reactor over weirs that are located 2 feet within the basin perimeter. Each tank has a diameter of 65 feet with a water depth of 12 feet. 2. What is the detention time in each clarifier (in minutes)? b. What is the overflow rate for each clarifier (in ft/ft?-d and gpd/ft?)? What is the weir loading rate for each clarifier (in ft'/ft-d and gpd/ft)? d. Calculate the values for parts a-c if only one clarifier is in service.arrow_forward
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