How do I find the interior dimensions (rounded to the nearest foot) of a rectangular grit tank basin to provide an average day hydraulic retention time (HRT) of 12 minutes with an average day influent flow of 3.0 MGD. Show answers on a dimensioned sketch. It does not have to be to scale but does need to be neat (drawn with straight edge). Work within the following constraints:Width to depth ratio of the liquid in the basin should be 1:1Length to width ratio equals 3.5:1Assume the inlet and outlets are on the opposite short sides of the rectangleAssume that a sharp-crested weir outlet is built into the effluent wallBasin should have 2.0 ft of freeboard above the water line at average flowHow do I find the elevation to set the invert of flap valves for the grit tank. State the recommended elevation (to the nearest 0.1 ft) and add a flap valve to the grit chamber sketch. Assume the following:Ground surface elevation = 750 ft (flush with the top of the grit chamber tank wall)Seasonal high groundwater elevation = 750 ftThickness of base slab of grit chamber = 2.5 ftIgnore weight of concrete walls and soil friction (to keep it simple)

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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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How do I find the interior dimensions (rounded to the nearest foot) of a rectangular grit tank basin to provide an average day hydraulic retention time (HRT) of 12 minutes with an average day influent flow of 3.0 MGD. Show answers on a dimensioned sketch. It does not have to be to scale but does need to be neat (drawn with straight edge). Work within the following constraints:

Width to depth ratio of the liquid in the basin should be 1:1
Length to width ratio equals 3.5:1
Assume the inlet and outlets are on the opposite short sides of the rectangle
Assume that a sharp-crested weir outlet is built into the effluent wall
Basin should have 2.0 ft of freeboard above the water line at average flow

How do I find the elevation to set the invert of flap valves for the grit tank. State the recommended elevation (to the nearest 0.1 ft) and add a flap valve to the grit chamber sketch. Assume the following:

Ground surface elevation = 750 ft (flush with the top of the grit chamber tank wall)
Seasonal high groundwater elevation = 750 ft
Thickness of base slab of grit chamber = 2.5 ft
Ignore weight of concrete walls and soil friction (to keep it simple)

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