Mixing Velocity Gradient (G / Gt)

The Camp-Stein velocity gradient G = sqrt(P / (mu x V)) and the Gt product that set floc formation.

Run the calculator

Example

You enter

Power input w 300
Basin volume m3 100
Water temp c 10
Detention time (s) 1200

You get

G value 48
Gt value 57492

Details, formula, and sources

Rapid mix wants G 500-1,000/s, flocculation G 20-70/s. G depends on water temperature through viscosity -- cold water is more viscous, so the same paddle delivers a lower G in winter and can drop below the 20/s floor. Too high a G shears the floc apart.

G = sqrt(P / (mu x V)); Gt = G x detention_time; mu = water dynamic viscosity at the given temperature.

Camp-Stein velocity gradient (Camp & Stein 1943; Ten States Standards), by name.

The velocity-gradient relation is a public water-treatment result; the viscosity comes from a standard water-property table and the treatment-process design governs.

Estimate. AHJ and licensed professional govern.

Field names used by the API: power_input_w, basin_volume_m3, water_temp_c, detention_time_s, g_value, gt_value

Temperature-viscosity mu from a water-property table (0.001307 Pa-s at 10 C, 0.00089 at 25 C); cold water lowers Gwater properties
Target bands rapid mix G 500-1,000/s, flocculation G 20-70/s, Gt 10^4-10^5Ten States Standards