Hydrants
Hydrant flow tests with the math done for you
Type the static, residual and flow readings. ExigentOps works out the rated flow at 20 psi and the NFPA 291 class and bonnet color while you type, and keeps every hydrant’s history.
Flow test — H-118, Main & 4th
Rated flow at 20 psi2,315 gpm
ClassAA · light blue bonnet
Last flushedMay 14, 2026
Save flow testNFPA 291 classes, calculated
Rated flow at 20 psi residual uses the standard formula, QR = QF × ((S − 20) ÷ (S − R))0.54, and the class follows from the result.
| Class | Rated flow at 20 psi | Bonnet color |
|---|---|---|
| AA | 1,500 gpm or more | Light blue |
| A | 1,000 to 1,499 gpm | Green |
| B | 500 to 999 gpm | Orange |
| C | Under 500 gpm | Red |
- GPS location from the phone with one tap, and an “Open in Maps” link on every hydrant.
- Types for dry barrel, wet barrel, flush, dry hydrants and draft sites, and cisterns, with main size and owner.
- Bulk import of up to 2,000 hydrants pasted from a spreadsheet, with bad rows flagged and duplicates skipped.
- Service history for flow tests, inspections, flushing, repairs and painting.
- Any member can mark a hydrant out of service with a reason. Only officers put it back.
- Shows up in pre-plans, with each linked hydrant’s class color and out-of-service status.
Try it on your next run report.
30 days free. Every feature, everyone on your roster. No card, no contract. We invoice by mail when you decide to stay.