A sedimentation basin in a water treatment plant treats a flow of 6 mgd and has the following dimensions: L = 120'; W = 12'; D = 12’. Water is being treated at an average temperature of %3D 20°C. Calculate the water detention time (in hours and minutes), horizontal velocity (in ft/min), and overflow rate (in gpd/ft?, gpm/ft2 and ft'/ft2-day). b. If a particle is to be 100% removed and has a specific gravity of 2.5, what is the corresponding particle diameter (in mm)? Is Stoke's Law appropriate for this situation? Why or why not? а.

A sedimentation basin in a water treatment plant treats a flow of 6 mgd and has the following dimensions: L = 120'; W = 12'; D = 12’. Water is being treated at an average temperature of %3D 20°C. Calculate the water detention time (in hours and minutes), horizontal velocity (in ft/min), and overflow rate (in gpd/ft?, gpm/ft2 and ft'/ft2-day). b. If a particle is to be 100% removed and has a specific gravity of 2.5, what is the corresponding particle diameter (in mm)? Is Stoke's Law appropriate for this situation? Why or why not? а.

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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Concept explainers

Field applications of hydraulic conductivity

Hydraulic conductivity is one of the hydraulic properties of soil defined as a measurement of the ability of a porous medium to permit water movement or fluid flow through it. It is denoted by the letter K. It is influenced by the density and viscosity of the fluid. It is also called permeability. Hydraulic conductivity is defined as the ratio of velocity to the hydraulic gradient. The different methods used to determine the hydraulic conductivity are laboratory methods (constant head permeability tests and falling head tests), in-situ field methods (pumping in and pumping out tests), small scale field tests (infiltration tests and slug tests), and indirect methods such as estimation from grain size, consolidation test data, and horizontal capillary test. The pedotransfer function (PTF) method is a specific empirical estimating approach employed in the soil sciences is also used to determine the hydraulic conductivity of the soil.

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3. A sedimentation basin in a water treatment plant treats a flow of 6 mgd and has the following dimensions: L = 120’; W = 12’; D = 12’. Water is being treated at an average temperature of 20°C.

a. Calculate the water detention time (in hours and minutes), horizontal velocity (in ft/min), and overflow rate (in gpd/ft², gpm/ft² and ft³/ft²-day).

b. If a particle is to be 100% removed and has a specific gravity of 2.5, what is the corresponding particle diameter (in mm)? Is Stokes’ Law appropriate for this situation? Why or why not?

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Take note: Answer and write your solution on a clean paper clearly. During a flood flow the depth of water in a 12 m wide rectangular channel was found to be 3.5 m and 3.3 m at two sections 300 m apart. The drop in the water-surface elevation was found to be 0.18 m. Assuming Manning’s coefficient to be 0.023, determine the following: a. Average value of k? b. Estimate the flood discharge through the channel ?
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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