🌧️ ASME A112.6.9 (Full-Bore Siphonic Priming, Downsized Pipe Diameters & Negative Head)

Siphonic Roof Drainage Calculator

Size full-bore siphonic roof drainage systems (Geberit Pluvia / Jay R. Smith) for large commercial warehouse and airport roofs under ASME A112.6.9: calculate negative pressure hydraulic priming ($100%$ water-filled pipe eliminating air core), reduce pipe diameters by 50% without slope, eliminate underground collector mains, and commercial drainage contracting profits.

1. Project & Operating Inputs

Roof Surface Catchment Area (Square Feet e.g. 150,000 Sq Ft Warehouse)

100-Year 1-Hour Rainfall Intensity (Inches / Hour e.g. 3.5" Rainfall)

Customer Bid Price for Supplied & Installed Siphonic System ($)

Siphonic Baffled Drains, HDPE Electrofusion Welded Pipe, Plumber Labor ($)

2. Financial Breakdown & Yield

ASME A112.6.9 SIPHONIC ROOF DRAINAGE

Turnkey Siphonic Roof Drainage Profit

Commercial Roof Drainage Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost