English English.   Español  Español.

The application of Appropriate Technology

Roof Water Harvesting

The most detailed and complete manual on domestic rainwater harvesting we could find in the entire world, by the IRC.

‘Rainwater harvesting’ is a widely used term covering all those techniques whereby rain is intercepted and used ‘close’ to where it first reaches the earth. The term has been applied to arrangements to cause rainfall to percolate the ground rather than run off its surface, to forms of flood control, to the construction of small reservoirs to capture run-off water so that it can be used for cattle or micro-irrigation and to the collection of run-off from roofs and other impermeable surfaces. Thus, roofwater harvesting is a subset of rainwater harvesting, albeit an important one. This handbook covers only roofwater harvesting.

This handbook has been written to assist NGO and government staff responsible for implementing domestic roofwater harvesting systems or programmes. It is also meant to serve as a source of material for rainwater harvesting associations preparing national design guidelines in local languages. Finally, it could be used by individual householders or masons literate in English to design single roofwater harvesting systems.

Part A (Chapters 1 to 4) is focused on answering the question “When should DRWH be considered as a water supply option for a specified location or country?” This entails addressing other questions, such as, “How might DRWH be combined with other water sources?” and “How can DRWH systems be delivered?” Thus, Part A is aimed at those with responsibility for choosing technology – for example managers of NGO and governmental water programmes.

The rest of the handbook, Part B, is aimed at those implementing DRWH programmes and concentrates on which of the many forms of DRWH should be used in particular circumstances.

Read the whole of this document as a PDF file (3.4 mb)