Guides | NZ Water Tank Calculator

How to measure your roof catchment areaWhy you measure the footprint rather than the sloped surface, and which parts of the roof to count.
What a first-flush diverter is and why the first rain is dirtyHow a first-flush diverter works, why the first rain off a roof is the dirtiest, and how to size and maintain one.
How your roofing material affects collected rainwaterHow different roofing surfaces affect the quality of collected rainwater, and why testing is the only reliable way to know if it is safe to drink.
Rural firefighting water supply requirementsHow a dedicated firefighting reserve works as a consent condition, and how it sits on top of your household rainwater storage.
What carted water costs in New ZealandHow much it costs to have water delivered by truck, and why that cost makes rainwater tank sizing concrete.
Rainwater and drinking water rules in New ZealandWhere private domestic rainwater supplies sit relative to registered water supply rules, and what Taumata Arowai's role is.