Rainwater runoff from roofs and other surface areas can be collected and stored for water reuse purposes.
The European Standardization Committee CEN/TC165/WG50 developed a standard for the collection, treatment and reuse of rainwater for private or commercial use which was published June 2018.
EN 16941-1:2018 On-site non-potable water systems - Part 1: Systems for the use of rainwater
This European Standard specifies the requirements and gives recommendations for the design, sizing, installation, identification, commissioning and maintenance of rainwater harvesting systems for the use of rainwater on-site as non-potable water. This European Standard also specifies the minimum requirements for these systems.
On-site collection and use of rainwater covers a variety of applications like toilet flushing, laundry, irrigation, climate control of buildings, cleaning, etc. at private and rented properties, residential areas, community developments, industrial sites, hotels, streets, parks, golf courses, theme parks, car parks, stadia.