Rainwater Sizing

Calculating yield

There are a number taking into consideration to size a rainwater harvesting system. To gain an efficient size its important to get a balance between rainwater yield, rainwater demand, budget, overflow frequency and future proposed applications. The form below is a quick calculation to estimate the size of rainwater harvesting based on yield and demand. This should only be used as a guideline.

Region
Roof Area Sq Meters
Gardening Usage Litres Daily
Washing Machine Usage Litres (Avg 50lt per wash) Daily
Toilet Usage Litres (Avg 6lt per flush) Daily
Other non potable use Litres Daily
Annual Demand Litres
Annual Yield Litres
Tank Capacity Litres
In accordance with BS8515:2009, calculate 5% of annual yield and demand, the tank capacity is the lesser of the two results.
 
 

The Company

Tri-Cel is part of the KMG Group. The KMG group has over 50 years experience in manufacturing composite products and over 10 years experience in the waste water treatment sector. The group employees over 200 people and has operations in Ireland, England Scotland and Northern Ireland.