OSCAR CALCULATOR

Size a drainfield, to the manual.

A preliminary OSCAR sizing tool — every result traced to the approved design manuals and drawn to scale. The Calculator and Ask OSCAR run on the same engine: two AI agents in constant dialogue on a single shared brain, so the number you size here and the answer the assistant gives stay locked to the same source of truth.

WA · OR · ID · AZ Verified to the design manuals Two AI agents · one shared engine

Design Conditions

Enter site values from the governing code.
gpd
gpd/ft²
Worked examples
Need help? Ask OSCAR →
OSCAR XO2 · Washington
OSXO2-360-5
Preliminary tool for engineers, designers, and regulators. A starting point for a design that a licensed professional reviews and signs — not a final engineered design. Homeowners, contact a local certified distributor.
Ask OSCAR