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1) Determine if the existing sedimentation basins are sufficient to accommodate the projected future capacity. If not, design upgrades to the sedimentation basins. A) Current Capacity: 22.5 MGD B) Future Capacity: 34.5 MGD for 110,000 residents C) If not, design upgrades to the sedimentation basins. 2) Specify the design flow rate, the type of basin (circular vs. rectangular) 3) Specify the basin dimensions (length, width, water depth or diameter and water depth). 4) Specify the dimensions of the launders (if applicable) and the length of the weir. b) Velocity - The velocity through a sedimentation basin should not exceed 0.5 feet per minute. The basins must be designed to minimize short-circuiting. Fixed or adjustable baffles must be provided as necessary to achieve the maximum potential for clarification. c) Outlet devices - Outlet weirs or submerged orifices shall maintain velocities suitable for settling in the basin and minimize short-circuiting. The use of submerged orifices is recommended in order to provide a volume above the orifices for storage when there are fluctuations in flow. Outlet weirs and submerged orifices shall be designed as follows: a) The rate of flow over the outlet weirs or through the submerged orifices shall not exceed 20,000 gallons per day per foot (250 m3/day/m) of the outlet launder or orifice circumference. b) Submerged orifices should not be located lower than three (3) feet below the flow line. c) The entrance velocity through the submerged orifices shall not exceed 0.5 feet per second.

1) Determine if the existing sedimentation basins are sufficient to accommodate the projected future capacity. If not, design upgrades to the sedimentation basins. A) Current Capacity: 22.5 MGD B) Future Capacity: 34.5 MGD for 110,000 residents C) If not, design upgrades to the sedimentation basins. 2) Specify the design flow rate, the type of basin (circular vs. rectangular) 3) Specify the basin dimensions (length, width, water depth or diameter and water depth). 4) Specify the dimensions of the launders (if applicable) and the length of the weir. b) Velocity - The velocity through a sedimentation basin should not exceed 0.5 feet per minute. The basins must be designed to minimize short-circuiting. Fixed or adjustable baffles must be provided as necessary to achieve the maximum potential for clarification. c) Outlet devices - Outlet weirs or submerged orifices shall maintain velocities suitable for settling in the basin and minimize short-circuiting. The use of submerged orifices is recommended in order to provide a volume above the orifices for storage when there are fluctuations in flow. Outlet weirs and submerged orifices shall be designed as follows: a) The rate of flow over the outlet weirs or through the submerged orifices shall not exceed 20,000 gallons per day per foot (250 m3/day/m) of the outlet launder or orifice circumference. b) Submerged orifices should not be located lower than three (3) feet below the flow line. c) The entrance velocity through the submerged orifices shall not exceed 0.5 feet per second.

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter7: Seepage
Section: Chapter Questions
Problem 7.6P
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1) Determine if the existing sedimentation basins are sufficient to accommodate the projected future capacity. If not, design upgrades to the sedimentation basins. A) Current Capacity: 22.5 MGD B) Future Capacity: 34.5 MGD for 110,000 residents C) If not, design upgrades to the sedimentation basins. 2) Specify the design flow rate, the type of basin (circular vs. rectangular) 3) Specify the basin dimensions (length, width, water depth or diameter and water depth). 4) Specify the dimensions of the launders (if applicable) and the length of the weir.
Transcribed Image Text:1) Determine if the existing sedimentation basins are sufficient to accommodate the projected future capacity. If not, design upgrades to the sedimentation basins. A) Current Capacity: 22.5 MGD B) Future Capacity: 34.5 MGD for 110,000 residents C) If not, design upgrades to the sedimentation basins. 2) Specify the design flow rate, the type of basin (circular vs. rectangular) 3) Specify the basin dimensions (length, width, water depth or diameter and water depth). 4) Specify the dimensions of the launders (if applicable) and the length of the weir.
b) Velocity - The velocity through a sedimentation basin should not exceed 0.5 feet per minute. The basins must be designed to minimize short-circuiting. Fixed or adjustable baffles must be provided as necessary to achieve the maximum potential for clarification. c) Outlet devices - Outlet weirs or submerged orifices shall maintain velocities suitable for settling in the basin and minimize short-circuiting. The use of submerged orifices is recommended in order to provide a volume above the orifices for storage when there are fluctuations in flow. Outlet weirs and submerged orifices shall be designed as follows: a) The rate of flow over the outlet weirs or through the submerged orifices shall not exceed 20,000 gallons per day per foot (250 m3/day/m) of the outlet launder or orifice circumference. b) Submerged orifices should not be located lower than three (3) feet below the flow line. c) The entrance velocity through the submerged orifices shall not exceed 0.5 feet per second.
Transcribed Image Text:b) Velocity - The velocity through a sedimentation basin should not exceed 0.5 feet per minute. The basins must be designed to minimize short-circuiting. Fixed or adjustable baffles must be provided as necessary to achieve the maximum potential for clarification. c) Outlet devices - Outlet weirs or submerged orifices shall maintain velocities suitable for settling in the basin and minimize short-circuiting. The use of submerged orifices is recommended in order to provide a volume above the orifices for storage when there are fluctuations in flow. Outlet weirs and submerged orifices shall be designed as follows: a) The rate of flow over the outlet weirs or through the submerged orifices shall not exceed 20,000 gallons per day per foot (250 m3/day/m) of the outlet launder or orifice circumference. b) Submerged orifices should not be located lower than three (3) feet below the flow line. c) The entrance velocity through the submerged orifices shall not exceed 0.5 feet per second.
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