This workbook organizes the evidence behind a plan. It does not evaluate legal compliance, select a backflow assembly or certify that a system is safe to install. No address, map or private plan link is needed; choices remain in the page and reset on reload.
Classify each input honestly
“Assumed” means a placeholder or unverified estimate. “Entered” means a value exists but its measurement method is unresolved. “Documented” means you have a dated source or measurement record; it does not necessarily mean the design is professionally approved.
Use an evidence ledger with the drawing
For each input, record its source, date, method and unresolved question. Keep the official requirement or manufacturer chart with the corresponding design assumption. If you change the connection, nozzle or route, revisit the evidence affected by that change.
A worked review scenario
In this invented example, a draft has measured dimensions, entered flow without an operating-pressure record, and an automated review label. Select “Documented” for dimensions and “Entered” for supply. The action list should ask for supply evidence; the automated label should not remove that task. No actual customer or installed system is represented.
Why these categories exist
Our audit of 20 saved rows found incomplete dedicated pressure fields and automated review metadata. That did not prove that the underlying projects lacked measurements, but it showed why a saved drawing should carry a separate evidence record.
Continue with the supply calculation worksheet, zone-demand guide and connection review guide. See editorial standards for the limits of our tools.