Water & Wastewater Calculators

Calculates daily BOD5, CBOD5, or COD loading divided by active MLVSS inventory derived from volume and MLVSS, volume and MLSS with a volatile fraction, or a directly entered MLVSS mass.

Calculates required dry or liquid chemical feed from flow and target dose, or back-calculates achieved dose from an actual feeder rate, with optional user-entered capacity screening.

Calculates achieved chlorine CT from a minimum residual and direct or process-unit T10, solves the T10 required for a user-entered CT target, or sizes a minimum effective volume from peak flow and a user-entered baffling factor.

Calculates surface overflow rate and solids loading rate for in-service clarifiers using explicit geometry, flow, unit-system, and solids-stream choices.

Draw a channel cross-section on FloorCanvas, type the water depth, slope and Manning's n, and get the flow area, wetted perimeter, hydraulic radius, top width, Manning flow rate and mean velocity, in US or Metric units, with a curve of flow rate against water depth. Canvas edits stay local until Calculate is pressed; every figure comes from the reviewed workbook, which reads Y as running down the page, refuses an outline whose edges cross, and marks with CHECK any part under the water that faces down.

Calculates standard 30-minute sludge volume index and companion settling indicators from either one 30-minute observation or a fixed 5-60 minute settling curve.

Calculates actual SRT/MCRT from system inventory and measured solids exits, or solves the nonnegative waste flow required for an entered target SRT on a consistent total- or volatile-solids basis.