A dam includes a sheet pile "cut off" wall near the toe, installed to 7 ft below the groundline. Water seepage is assumed to be at steady state at this time step shown. At thistime, the depth of the upstream pond (headwater) is 5 feet. The groundwater is at the same level as the ground on the downstream/tailwater side. The sand stratumthickness, where water is flowing, is 9 ft thick.The permeability of the sand, in the zone of the flow net, is k=42ft/day, the length of the dam (into the page) is 150 ft, and the unit weight of the sand is ysat=128Ib/ft (saturated unit weight of the soil). Use yw=62.4 pcf (unit weight of water) for your calculations, where necessary.A. What is the flow rate of water emerging at the surface at the downstream side (for the full 150ft long dam structure, into the screen) inft3/day?B. What is the effective vertical stress, ov', at Poin. C in psf? Note that C is 5.5 ft below the surface level.C. What is the maximum exit gradient? (use the dimensions given in the problem state to help estimate lengths where needed).D. What is the factor of safety against a quick condition? (use the dimensions given in the problem state to help estimate lengths whereneeded). AHOLDERBACE DAMB.ABEDROCk

Given H= 5ft K = 42 ft/day Nf = 3 , Nd = 12 Note Due to the company rules i am able to answer…

Answered: AHOLDERBACE DAM B. A BEDROCk

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter5: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 5.11P

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A dam includes a sheet pile "cut off" wall near the toe, installed to 7 ft below the groundline. Water seepage is assumed to be at steady state at this time step shown. At this time, the depth of the upstream pond (headwater) is 5 feet. The groundwater is at the same level as the ground on the downstream/tailwater side. The sand stratum thickness, where water is flowing, is 9 ft thick. The permeability of the sand, in the zone of the flow net, is k=42ft/day, the length of the dam (into the page) is 150 ft, and the unit weight of the sand is γsat=128 lb/ft3 (saturated unit weight of the soil). Use γw=62.4 pcf (unit weight of water) for your calculations, where necessary.What is the factor of safety against a quick condition? (use the dimensions given in the problem state to help estimate lengths, where needed)
An earthdam has a crest width of 15 feet , total height of 40 feet and the inclinations at heel and at toe both at 45 degrees w.r.t. the horizontal. If the coefficient of permeability of the earthdam material is 0.00042 ft/min, determine the seepage rate in cubic feet/day/ft of dam. Height of water at upstream is 30 feet. Use Dupuit's method. O 3.8428 O.00277 O 3.5873 O.00267 |oooo
ASAP
Direction: Choose A - When both statements are true; B - When both statements are false; C- When the first statement is true and the second statement is false; D- When the first statement is false and the second statement is true. First Statement: Seepage velocity is just the ratio of the porosity to the Darcy velocity. Second Statement: The hydraulic gradient of an aquifer is positive when the groundwater flows from a point with higher head to another point with lower head.
An unconfined aquifer is 100 feet thick was evaluated using a field pumping test. The depth to groundwater is 10 feet. At a distance of 1000 feet, the drawdown was 40 feet, and at a distance of 5000 feet it was 20 feet. Find the permeability of the aquifer assuming that a steady-state of 960 gal/minute during the test in ft/sec.
A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping of 2.18m below the ground surface. The aquiclude has a thickness of 5.7m measured from the ground surface and confined aquifer is 7.6m deep until it reaches the aquiclude at the bottom. At a steady state pumping rate of 15.6 ?7??6?3/?2h?7??1? the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distances of the observation wells from the center of the test well were 15m and 32m respectively. The radius of the test well is 1m. Determine the coefficient of permeability (m/hr) Select the correct response: 2.15x10-5 0.215 0.597 5.97x10-5
A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. Provide a diagram a.600 ml/s/meter length b.300 ml/s/meter length c.900 ml/s/meter length d.1200 ml/s/meter length
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:
A sand layer of the cross-sectional area shown in the figure has been determined to exist for a 450m length of levee. The coefficient of permeability of sand is 3m/day. Compute the quantity of water which flows into the ditch in liters/sec. and determine the seepage velocity if the porosity of the sand is 0.22. EL.160m El.150m ditch Impervious layer Permeable and layer: t-15m layer, 1.5m Impervious layer thick L= 120m
Q-b A sand layer of the cross-sectional area shown in Fig. Q-b (page 2) has been determined to exist for a 500-m length of the levee. The hydraulic conductivity of the sand layer is 2.3 m/day. Determine the quantity of water which flows into the ditch in m³/hr.
A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter length
A dam, shown in Figure 5 retains IO m of water. A sheet pile wall (cutoff curtain) on theupstream side, which is used to reduce seepage under the dam, penetrates 7 m into a 20 mthick silty sand stratum. Below the silty sand is a thick deposit of clay. The averagecoefficient of permeability of the silty sand is 2.0 x 10-4 cm/sec. Assume that the siltysand is homogeneous and isotropic.(i) Draw the flow net under the dam.(ii) Calculate the seepage rate, q per meter length of the sheet pile.

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