Question

the agricultural drainage problem on the west side of the san joaquin valley was caused or made worse by

Answer 1

1. poorly draining soils, contributing to the shallow water table

2. irrigation with imported surface water while also reducing groundwater pumping, causing a shallow water table

3. the lack of a means for disposing of the contaminated drainage waters

4. discharge of the toxic drainage waters in to holding ponds that were also used as wildlife refuges

5. the presence of relatively high selenium concentrations in the soils

Explanation: yipppee