Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 7, Problem 7.6P
To determine
Draw the flow net.
Find the rate of seepage under the weir.
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Draw a flow net for the weir shown in Figure below. Calculate the rate of seepage under the
weir.
37 m
10 m
1.5 m
9 m
Sheet pile
24 m
k = 10-3 cm/sec
Impermeable layer
Draw a flow net for the weir shown in Figure 8.20. Calculate the rate of seepage
under the weir.
37 m
10 m
m
m
Sheet pile
24 m
k- 10-3 cm/sec
Impermeable layer
Figure 8.20
A concrete pipe culvert 3 ft in
diameter and 10 m long has a
difference in water level at the
outlet 1.52 m. What is the
discharge? Assume coefficient
of discharge C = 0.74
1.52
L=10m
28.57 m^3/s
2.66 m^3/s
50.78 m^3/s
4.72 m^3/s
Chapter 7 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Draw a flow net for the weir shown in Figure B, then calculate the rate of seepage under the weir. In addition, evaluate the exit gradient in the first flow channel of the last field against the critical gradient. Assume e = 0.60, and G, = 2.60, 37 m 10 m 1.5 m 3 m 9 m Sheet pile 24 m k = 1 x 10-3cm/sec Impermeable Layerarrow_forwardFigure D shows a diagram of the flow net of water for the weir. if the permeability of the permeable layer is 1.02 x 10-5 and H= 10 m, what is the rate of seepage under the weir? Answer in 7 decimal without unit. Unit in m3/s. 1||4 1 1 Figure D: Flownet at site ABC Toearrow_forward5- An earth dam is shown below. Determine the seepage rate, q, in ft/day/ft length. Given: a1=35°, az=40°, L1=5 ft, H=7 ft, Hj=10 ft, and 3X104 ft/sec. Water level k H a2 Impervious basearrow_forward
- Question 8 Find the flow rate in m'/sec/m length (at right angles to the cross section shown) through the permeable soil layer shown in Figure Q8 given H=8 m, H1=3 m, h-4 m, L=50 m, a-8°, k-0.08 cm/sec. Direction ఆf tow O Empervious layer Permeable layer Figure Q8. Name / ID number: Answer:arrow_forwardThe flow net under a hydraulic structure has 5 flow channel with 10 equipotential drops. If the permeability of the bed material is 1.5 *10^-4 m/sec, find the quantity of seepage per meter width of the structure in m ^ 2 /sec under 3m head.arrow_forwardShow complete solution(need ASAP): The coefficient of permeability below a dam is 4 m/day. The water on the upstream side is 20 m. higher than on the downstream side. To estimate the seepage below the dam, a flow net was graphically drawn. The base of the dam is founded 1 meter below the ground. Between the heel and the toe of the dam, a distance of 30 m, there are 8 potential drops. a. Evaluate the seepage flow per meter length of the dam in cu.m per day. b. Compute the uplift force per unit length along the axis of the dam in kN/m. c. Determine the position of the uplift force from the toe of the dam in m.arrow_forward
- 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 = ______ ASLarrow_forwardThe figure is a plan view of a confined aquifer showing two contaminated zones, 1 and 2. The aquifer has a saturated thickness of 80 ft, hydraulic conductivity of 42 ft/d, and the regional hydraulic gradient is 0.0075 from right to left as shown. A pumping well with a flow rate of 170 gpm is planned to run continuously at the location shown, and form a stable (equilibrium) capture zone. You may assume that the 2500 ft distance from the well to zone 1 is long enough that the capture zone has reached its maximum width. 2 200 ft Determine: pumping well 2500 ft 700 ft regional flow direction 1. If contamination from zone 1 find its way to the pumping well? Provide support for your answer with a capture zone analysis or contaminant simulation model. 2. If contamination from zone 2 find its way to the pumping well? Provide support for your answer with a capture zone analysis or contaminant simulation model.arrow_forwardThe weir shown below is 50 m long Draw a flow net for the flow under the weir Calculate the rate of seepage for the entire weir. Calculate the total uplift force acting on the weir base. Calculate the exit hydraulic gradient near the toe of the weir 37 m 10 m ==1,5 m 3 m 9 m Sheet pile > 24 m k = 10–3 cm/sec Impermeable layerarrow_forward
- 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_forwardHow 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 = _____MGDarrow_forwardThe dam and flow net shown in the attached picture. The dam is 120 m long and has two 10 m sheet piles driven partially into the granular soil layer. Datum is at tailwater elevation. Determine: 1. The quantity of seepage loss under the dam when k= 20*10^(-4) cm/s 12 m 10 m sheet pile 10m sheet pille 85m 30 m Impervious - O C 0.4 1 Scale: Number al equipotential dropsarrow_forward
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