1. You are to design four sedimentation basins which operate in parallel. The total flow influent, coming from the flocculation basin is 24 MGD. Each basin is 30 ft. wide, 240 ft. long and has an effective settling depth of 10 ft. The dynamic viscosity of water is 2.73 E-5 lb/sec/ft2 at 50 degrees Fahrenheit. The kinematic viscosity of the water is 1.41 E-5 ft2/sec. The specific gravity of the particles to be settled is 1.60. a. What is the nominal detention time for sedimentation? b. What is the overflow rate in gal/day/ft2. c. What is the settling velocity (ft/sec) of the smallest discrete particle that will be 100% removed? d. According to Stokes law what is the diameter (ft) of the smallest discrete particle that will be 100% removed? e. What is the horizontal water velocity (ft/min) in the sedimentation basin?

1. You are to design four sedimentation basins which operate in parallel. The total flow influent, coming from the flocculation basin is 24 MGD. Each basin is 30 ft. wide, 240 ft. long and has an effective settling depth of 10 ft. The dynamic viscosity of water is 2.73 E-5 lb/sec/ft2 at 50 degrees Fahrenheit. The kinematic viscosity of the water is 1.41 E-5 ft2/sec. The specific gravity of the particles to be settled is 1.60. a. What is the nominal detention time for sedimentation? b. What is the overflow rate in gal/day/ft2. c. What is the settling velocity (ft/sec) of the smallest discrete particle that will be 100% removed? d. According to Stokes law what is the diameter (ft) of the smallest discrete particle that will be 100% removed? e. What is the horizontal water velocity (ft/min) in the sedimentation basin?

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter16: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 16.10P

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