Abstract
The load-flow relationship of salt in drainage water was studied using drainage water flow and salinity data from an irrigation district on the west side of the San Joaquin Valley of California. Flow and salinity data were collected from the main district drain, individual drainage sumps, and two field sites. Linear regression was used to describe the salt load-flow relationship at each drainage site. The slope of the regression line for the salt flow in the main drain was different compared to the subsurface drainage sites because of the inclusion of surface runoff from irrigation in the main drain. The EC in the water from the subsurface drains was not correlated with the flow rate. Cluster analysis of the load-flow relationships of 45 individual drainage sumps indicated that the load-flow relationship for flow from the district could be characterized by one of three relationships.
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