TABLE $10\mathrm{.}2$ EXPERIMENTAL DATA

AND CALCULATED

VALUES FOR HYDRAULIC

ANALYSIS OF THE LONG

NARROW CHLORINATION

TANK IN EXAMPLE $10\mathrm{.}4$

A water treatment plant is designed to process $20$ mgd $.$

The flocculator is $100$ ft long, $50$ ft wide, and $16$ ft $.$

deep. Revolving paddles are attached to four

horizontal shafts that rotate at $1\mathrm{.}5$ rpm $.$ Each shaft

supports four paddles that are $8$ in $.$ wide, $48$ ft long,

and centered $6$ ft from the shaft. Assume the mean

water velocity is $30\%$ of the paddle velocity and $C_D=$

$1\mathrm{.}9.$ Find

$($a$)$ The difference in velocity between paddles and

water;

$($b$)$ The value of G$,$ and

$($c$)$ The retention time.