The spreading basin (percolation pond) method for artificial groundwater recharge is most effective when:
Choose the correct answer
The aquifer is confined and deep
The water table is shallow and the vadose zone is thin, with permeable soil (sand/gravel) allowing rapid infiltration of surface water to the aquifer
The soil is impervious clay
There is no seasonal rainfall
Correct Answer
B. The water table is shallow and the vadose zone is thin, with permeable soil (sand/gravel) allowing rapid infiltration of surface water to the aquifer
Why is this the answer?
Artificial recharge methods: (1) Spreading basins/percolation ponds: impoundment of runoff, water percolates to water table; best for unconfined aquifer with permeable strata; (2) Recharge wells/injection wells: for confined aquifer; (3) Modified streambeds: excavated or cleared channels; (4) Check dams/subsurface dams: retard runoff, increase percolation time.
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