3. A settling tank has an overflow rate of 100,000 gal/ft2.d. Water carrying sediment of various sizes enters the tank. The sediment has the following distribution of settling velocities. Settling velocity (ft/min) Mass fraction remaining 10.0 0.54 5.0 0.45 2.0 0.35 1.0 0.20 0.75 0.10 0.50 0.03 What is the gravimetric percentage of sediment particles completely removed? (A) 32% (B) 39% (C) 47% (D) 55%

3. A settling tank has an overflow rate of 100,000 gal/ft2.d. Water carrying sediment of various sizes enters the tank. The sediment has the following distribution of settling velocities. Settling velocity (ft/min) Mass fraction remaining 10.0 0.54 5.0 0.45 2.0 0.35 1.0 0.20 0.75 0.10 0.50 0.03 What is the gravimetric percentage of sediment particles completely removed? (A) 32% (B) 39% (C) 47% (D) 55%

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.14P

See similar textbooks

Similar questions

A course sand sample is placed in the constant permeameter test. Water passes through the sample water with a constant head of 40cm and after 0.00167hr, 40grams of water have been collected. What is the coefficient of permeability of the sand in cm/sec if the sample is placed inside a 166cm container with a 7.89cm radius?
In a constant head permeameter with cross section area of 10cm2 when the flow was taking placeunder a hydraulic gradient of 0.5. the amount of water collected in 60seconds is 600cc.find thepermeability of soil..
A concrete dam retains water to a height of 9 m. It has rows of sheet piling at both heeland toe which extend half way down to an impervious stratum. From a flow net sketchedon a transformed section, it is found that there are four flow channels and sixteen headdrops. The average horizontal and vertical permeabilities of the soil are 6 × 10^–3 mm/sand 2 × 10^–3 mm/s, respectively. What is the seepage in cubic meter per day, if the lengthof the dam is 150 meters?
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below thesilt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface. The following data are available for both the silt and clay layers of soil. Silt layer: ?10= 0.018 mm, e= 0.7, and Gs = 2.7 Clay layer: e = 0.8 and Gs = 2.75 Required: (a) Height of capillary rise, (b) capillarypressure, (c) the effective pressure at theground surface, at groundwater table (GWT)level, at the bottom of the silt layerand at a depth of H =6 m below groundlevel, and (d) at a depth 2 m below ground level.(Sketch or draw the stress distribution diagram).
A 12m high circular tank with 45m radius contains oil weighing 9.4kN/m3. This tank stands over a 3m saturated sand layer (γsat = 18.88 kN/m3) underlain by a 14m thick clay layer (γsat = 17.30 kN/m3 , e = 1.27 and Cc = 0.40). Neglect weight of the tank. Assume no precompression has occurred. What is the difference between the settlement below the center and below the end of the tank?
The dam shown has a base of which 2m below the ground surface. The pressure distribution diagram at the base of the dam can be obtained from the equipotential lines as follows: k=4.5 m/day. if H=6m determine the seepage through the foundation.
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below the silt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface.The following data are available for both the silt and clay layers of soil.Silt layer: ?10 = 0.018 mm, e = 0.7, and Gs = 2.7Clay layer: e = 0.8 and Gs = 2.75Required: (a) Height of capillary rise, (b) capillary pressure, (c) the effective pressure at the ground surface, at groundwater table (GWT) level, at the bottom of the silt layer and at a depth of H =6 m below ground level, and (d) at a depth 2 m below ground level. (Sketch or draw the stress distribution diagram).
Find the rate of flow in m3/sec/m through the permeable soil layer. Given: H = 5.5 m, H1 = 2 m, h = 3.5 m, S = 40 m, a = 17°, and k = 0.085 cm/sec.
Find the seepage velocity through soil 1 if the average velocity is 0.0073 meters per second. Use 3 decimal places. H1 = 1.25 m n1 = 32%H2 = 2.51 m n2 = 22% H3 = 2.51 m n3 = 28%
I.) From the flow curve what is the liquid Limit? a) 39.683% b) 40.555 % c) 38.992 % d) 39.875% II.) If the Plastic limit is 18.750 % what is its plasticity index? a) 22.431 % b) 20.918 % c) 21.344 % d) 20.819 % III.) If in-situ moisture content is 31% determine its liquidity index? a) 0.665 b) 1.59 c) 0.585 d) 20.588 IV.) If the percentage of clay-size fraction is 4.831. Based on its Activity, this mineral is more likely to be a) Illites b) kaolinite c) Attapulgite d) Smectites
If the settling velocity of a particle is 0.70 cm/s and the overflow rate of a horizontal flow clarifier is 0.8 cm/s, what percent of the particles are retained in the clarifier?
A settling tank has an overflow rate of 100,000 gal/ft^2 •d. Water carrying sediment of varioussizes enters the tank. The sediment has the following distribution of seIling velocities. What is the gravimetric percentage of sediment particles completely removed? (A) 32%(B) 39%(C) 47%(D) 55%