$\frac{m^3}{?}$ day?

A $20-$mgd water treatment plant has a flocculation tank $58ft$ long and $94ft$ wide with a water depth of

$15ft.$ The four horizontal shafts of paddle flocculators are compartments separated by baffles. All the

paddle units have four arms with two blades. The power dissipated by the paddle mixers is $4,386$

ft$.$lb$/$s$.$

Given the viscosity of the water as $2\mathrm{.}735{10}^{-5}lb.\frac{s}{f}{t}^2,$ calculate the velocity gradient. show all conversions and explanationns $.$thank you for answering