Study and analysis of Irrigation furrow measurement, Flow rate Soil
moisture distribution and Gross depth at Melka Hida small scale
irrigation scheme
Abstract
Abstract Techniques of furrow preparation on a field are mostly
traditional; farmers provide furrow shape and direction based on their
experience without the concept of scientific information. The
measurement, evaluation and optimization of furrow irrigation are
restricted to the single furrow or small number of adjacent furrows. The
measurement process is too intensive to be applied at the full field
scale. Consequently; it is necessary to assume that the infiltration
characteristics and inflow rates of the measured furrow(s) represent the
remainder of the field. The field inflow and outflow rates of five
irrigation events in experimental plots were planned. The gross applied
and estimated depth of irrigation was determined for a scheme based on
the available data of inflow rate, which was measured through the
graduated bucket and CROPWAT 8 model, respectively. Soil specific
calibration was made for the soil moisture reading and its error result
is presented. Furrow parameters including; furrow slope, width, length,
and shape were measured and presented. The results of soil moisture
measurements showed that crops are water stressed during the experiment
period. Application efficiency decreases with increasing steep slope and
cutoff time, large applied depth, and high inflow rate in the study
area. The Melka Hida small scale irrigation scheme was granted to
farmers and empowered them occasionally to harvest twice in a year. With
increased population growth and the erratic rainfall, competition of
water users in this area is reported increasing from time to time. This
limits water usage, crop production and overall living standard of
farmers of this region.