Tapered Flocculation G Schedule
The mixing power each stage of a tapered floc train needs.
Example
You enter
- Stage 1 target G (per s, highest) 50
- Stage 2 target G (per s) 30
- Stage 3 target G (per s, 0 for 2-stage) 20
- Stage volume (m³) 100
- Water temp c 15
- Total detention time (min) 30
You get
- Stage1 power w 284.5
- Stage2 power w 102.42
- Stage3 power w 45.52
- Total mixing power 432.4 W (tapered)
- Mean g 33.3333
- Gt value 60000
Checked against published worked examples from: Camp & Stein 1943 / Ten States Standards.
Details, formula, and sources
ScopeP_stage = G_stage^2 x mu(T) x V, the Camp-Stein relation inverted across 2-3 stages of decreasing G. A 50/30/20 per-second taper in three 100 m^3 stages at 15 C needs 285 / 102 / 46 W - the last stage runs at a sixth of the first, the gentle finish that grows settleable floc without shearing it. Reports the composite Gt and flags a schedule that is not tapered or steps outside the 10-100/s band. A design aid, not a process design.
Formula or tableP_stage = G_stage^2 x mu(T) x V_stage (Camp-Stein inverted); Gt = mean(G) x total_time; mu = water dynamic viscosity at the given temperature.
Source and editionCamp-Stein velocity gradient, tapered multi-stage schedule (Camp & Stein 1943; Ten States Standards), by name.
Free accessThe velocity-gradient relation is a public water-treatment result; the viscosity comes from a standard water-property table and the treatment-process design governs.
What governsEstimate. AHJ and licensed professional govern.
API field namesstage1_g_per_s, stage2_g_per_s, stage3_g_per_s, stage_volume_m3, water_temp_c, total_detention_min, stage1_power_w, stage2_power_w, stage3_power_w, total_power_w, mean_g, gt_value
- Equal stages each stage is taken at the same volume; the power is P = G^2 mu V per stage from the inverted Camp-Stein relationCamp & Stein 1943
- Tapered band G decreases stage to stage, each in the 10-100/s flocculation band; merging rapid mix shears the flocTen States Standards