A study report published by and written on behalf of the Food and Agriculture Organization (FAO).

Mapping systems and Services for Multiple Uses (MASSMUS) is a module for assessing non-crop water uses in an irrigation scheme within the general approach developed by FAO for auditing the irrigation system management called MASSCOTE (Mapping Systems and Services for Canal Operation Techniques). The need to develop specific approach to multiple uses of water in an irrigation system stemmed from an analysis of 30 irrigation schemes, which revealed that non-crop water use and multiple functions of irrigation schemes were more of a norm than the exception.

The Krishna Western Delta System is located in South India in the state of Andhra Pradesh –on the right bank of the downstream stretches of the Krishna river, along the sea coast (Bay of Bengale). The climate of the Krishna Western Delta is dominated by the southwest monsoon which provides most of the precipitation for the region. The mean annual rainfall amounts to 800 - 900 mm, and about 90% of the rainfall is received during the monsoon months of May to October. The climate can be classified as sub-humid, with minimum and maximum average temperatures ranging from 12.8 to 26.0 °C and 29.7 to 46.5 °C respectively. [authors abstract]