Abstract
ABSTRACT A highly permeable backfill was created by trenching and backfilling directly over drains installed 6 yr earlier in a lakebed clay soil. The backfill increased drain flow rates by a factor of two to four during periods of ponding but had no effect on flow rates after ponding ceased. The full potential of the backfill could not be determined because of the limited hydraulic capacity of the drains. The backfill had no effect on water table drawdown, apparently because of excellent surface drainage that diverted ponded water from untrenched drains to adjacent trenched ones. After one year, flow rates remained the same where the permeable backfill extended to within 5 cm of the drain but were reduced 20 to 25 percent where the backfill extended to the drain.
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