Tank velocity at Barking.
It appears that the calculated velocity in the channels of the precipitation tanks at Barking is about 4 feet per minute, and that with this velocity about 77 per cent. of the suspended matters were deposited in the year 1894.
Tank velocity at Manchester.
At the Manchester tanks it is stated that a velocity of 3 feet 4 inches per minute is employed.
Velocity frequently adopted.
A rate of velocity now frequently adopted in this country for new works is 6 inches per minute.
Frankfort experiments.
In the settling tanks at Frankfort on the Main there are deposited about 84 per cent. of the suspended matters, with velocities ranging from 9½ inches to 16½ inches per minute.
Cassel experiments.
With a velocity of 7 inches per minute, it is stated that at the Cassel sewage works 97 per cent. of the suspended matters are retained in the tanks.