Weir Overflow Rate Calculator
Calculate water overflow in gallons per minute (GPM) from the measured depth over a Fine Material Washer or Aggredry® weir.
01 / Inputs
Washer Specifications
Select a washer or enter a custom effective weir length, then provide the measured overflow depth.
02 / Results
Your Overflow Rate
Estimated actual water flow at the selected overflow depth.
Calculated Overflow
—GPM
Based on the published GPM-per-foot depth lookup.
Effective Weir Length—
Lookup Rate—
#150 Mesh Comparison Reference—
Nearest Reference Depth—
Expected Flow at Reference Depth—
Selected Model—
Engineering Notes
Calculation Assumptions
- Actual overflow (GPM) = chart GPM per foot × effective weir length in feet.
- Depths use the published ¼-inch through 2⅞-inch source chart in ⅛-inch increments.
- Fine Material Washer presets use published effective weir lengths. Aggredry® presets retain source-table precision using the published one-inch flow values.
- The #150 mesh water-capacity reference is for comparison, not an automatic operating target.
Intended Use and Limitations
Use these results for preliminary overflow estimation and field adjustment. Actual conditions, weir geometry and operating requirements should be reviewed by qualified personnel.
Engineering Source
Superior Field App 3.3.11+52: Fine Material — Weir Overflow in Gallons per Minute chart; corrected Aggredry® weir data; Field Guide #150 mesh water-capacity references.