Economics of furrow irrigation under partial infiltration information

The effects of partial infiltration and furrow geometry information on furr ow irrigation design and economic return to water were quantified on a sing le furrow (reference furrow) and field-wide (10-furrow set) basis using a k inematic-wave furrow irrigation model in conjunction with an economic optim ization model. A furrow sampled at 10 locations was assumed to represent th e actual field condition. Subsamples were randomly drawn from the 10 sample s and return to water was maximized. These suboptimal designs were applied to the actual furrows and monetary loss due to lack of information was simu lated. The monetary loss was less for furrow irrigation designs having high inflow rates ($0.38/furrow, $17/ha) than for the low inflow rates ($2.27/f urrow, $100/ha). Average loss decreased from $31/ha ($0.71/furrow) to $0/ha in the case of the reference furrow and from $1.0/furrow ($44/ha) to $0.3/ furrow ($13/ha) in the case of the 10-furrow set for the samples sizes of 1 and 10, respectively.