This factsheet provides a summary information on irrigation efficiency and productivity within a Tanzanian/East African context. It explains three main methods for examining efficiency/productivity and makes the point that all three methods and sub-methods should be used to describe and understand water utilisation. An over-reliance on one (usually conventional) method would give an inaccurate picture and usually one that is too pessimistic.
A Factsheet for RIPARWIN Project, DFID-KAR Project No. R8064, Soil-Water Management Research Group, Sokoine University of Agriculture, Tanzania, pp 4