Direction: ChooseA - When both statements are true;B - When both statements are false;C- When the first statement is true and thesecond statement is false;D- When the first statement is false and thesecond statement is true.First Statement: Seepage velocity is just the ratioof the porosity to the Darcy velocity.Second Statement: The hydraulic gradient of anaquifer is positive when the groundwater flowsfrom a point with higher head to another pointwith lower head.

Given data in question Seepage velocity Porosity Darcy velocity Hydraulic conductivity To find…

Answered: First Statement: Seepage velocity is…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The US Geological Survey wants to know how long it will take for a contaminant in an aquifer to research a monitoring well. They will first need to determine the velocity at which the groundwater is traveling. Given that the hydraulic gradient is 0.00115, hydraulic conductivity is 1000m/d, and a porosity is 0.23 find: The Darcy velocity The actual linear velocity.
5. Define oil formation voume factor with its formula. (I need definition and formula )
The figure below shows two flow lines for seepage across an interface between two soil media of different co-efficient of permeability. If entrance angle a₁ = 30°, the exit angle a2 will be k, = 1.0 x 10-7 m/s al al a2 k, = 4.0 x 10-7 m/s a2
The hydraulic conductivity (K) of a homogeneous sandy clay mix aquifer is 2x10-3 cm/sec. The hydraulic gradient (groundwater surface slope) of the phreatic (water table) aquifer is 0.01 and the aquifer's effective porosity is 0.35. Calculate the average (advective) velocity of a conservative contaminant discharged to this groundwater unit. Enter your answer rounded to the nearest tenth in meters/year. Example: 5.2 , 65.7, 224.3 would all be proper forms of your answer.
The 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.
The hydraulic conductivity (K) of a homogeneous clay/sand mix aquifer is 2x10-4 cm/sec. The hydraulic gradient (groundwater surface slope) of the phreatic (water table) aquifer is 0.08 and the aquifer's effective porosity is 0.25. Calculate the average velocity of a conservative contaminant discharged to this groundwater unit. Enter your answer rounded to the nearest tenth in meters/year. Example: 5.2 , 65.7, 224.3 would all be proper forms of your answer
Answers: a) 360 cm3/sec b) 1.12 c) 2.8 meters
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The 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.
Design a sedimentation basin for a water treatment plant with the following specifications assuming it is required to supply a city with a population of 50,000 people: Rectangular or square basin • Depth: 7-18 ft ● . • Width: 10-50 ft Detention time: 4-8 hours Flow through velocity: <0.55 ft/min Overflow rate: 400-1,100 gal/day-ft² Draw a figure to show calculated dimensions. You may consider to use SI units in calculations. ● ● Hint: Overflow rate is Flow/Surface Area; Detention time is Volume of tank/Flow rate; and Depth= Volume/Surface area

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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. Oc OD OA