384 CHAPTER THIRTEEN
Length of grit chamber (ft) (volume)/[(width, ft) (depth, ft)] (13.86)Length-width ratios range from 3:1 to 5:1.
The air supply requirement for an aerated grit chamber ranges from 2.0 to
5.0 ft^3 /min/ft of chamber length (0.185 to 0.46 m^3 /minm).
(13.87)
Grit quantities must be estimated to allow sizing of grit handling equipment
such as grit conveyors and grit dewatering equipment. Grit quantities from an
aerated grit chamber vary from 0.5 to 27 ft^3 /Mgal (3.74 to 201.9 m^3 /L) of flow.
Volume of grit (ft^3 /day)(assumed grit quantity, ft^3 /Mgal)
(Mgd handled) (13.88)Air supply required (ft^3 /min)(chosen air supply, ft^3 /min/ft)
chamber length, ft