Groundwater in a regraded, previously unstable slope was controlled by installation of a parallel array of horizontal drains. During a major rainstorm, the discharge from these drains was measured continuously over a period of 65 hours. The results showed that groundwater flow was taking place preferentially along highly permeable subsurface drainage paths and that the overall piezometric level was being controlled by the drains. The characteristics of the drainage curve indicate that some drainage paths only operate at times of high flow.

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