Roof Rainwater Drainage Calculations

Upon completion a full set of rainwater drainage design calculations are provided confirming the suitability of products.

Roof rainwater drainage calculations.

Nds quickly identifies drainage problems and selects the right solution to resolve issues at home. The new nds app is the perfect tool for determining runoff and system requirements on the go. Roof drainage requirements specifications. A simple rain catchment system can provide water for outdoor use resulting in.

Take the roof s total square footage and divide by the total square footage handled by one drain. Wondering how much rainwater you could collect off your roof. The above sizing data is offered as a guide only. The tools guide the user step by step allowing fast and simple roof drainage design whilst ensuring full compliance with bs en12056 3 rainwater drainage design standard.

Rain barrels store and reuse rainwater helping to reduce the overtaxing of sewer systems and protect the quality of groundwater. The speed at which the rain collects at the drain. The roof drainage outlets and rainwater downpipes are calculated based on the design principles for gravity drainage systems established in ss525 2006 code of practice for drainage of roofs. This article describes several methods for determining the drainage capacity required to safely drain water off of building roofs whether from rainfall melting snow or a combination of those water sources.

Box gutter with rain water head at end of box gutter. Standing water in your basement driveway or yard. The number of roof drains shown should be verified with local code requirements. The result is the number of drains needed.

This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table. The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain. Mep work provides free excel calculator for drainage calculation of roof rainwater and storm water. How to calculate roof runoff.

Calculate drains needed. 512 490 0932 501 w powell ln 206 austin tx 78753 harvesting rain conserving water and managing stormwater in texas since 2004. Three spreadsheet for free download with direct links. Use this rainwater harvesting calculator to find the answer.

Simplified suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments. Calculate your drainage install on site.