Field glossaryDesign rainfall rateThe 100-year rainfall in inches per hour for the site, from the code map or NOAA Atlas 14Used across 2 Anvilfield field guides, most in Plumbing. Where this shows upPlumbingInterior storm drainage piping sizingRoofingRoof drainage and drain sizing Related termsBackwater valveCombined sewerRain load Back to the full field glossary