The waste water generated in these areas normally percolates into the soil or evaporates. The waste water generated in these areas normally percolates in the soil or evaporates. Water percolates deep into sand where it is safe from evaporating winds and sun. In these areas, rainwater runoff percolates quickly through the soil. The solution then percolates through the heap and leaches both the target and other minerals. The heated water percolates upwards, dissolving calcium carbonate from limestone deposits on its way by. Instead, runoff is routed to sumps, where it percolates into the ground. Water then percolates down through the gravel which itself is the filtration material. The mercaptan oxidation reaction takes place as the feedstock percolates downward over the catalyst. Some of the water is absorbed, and the rest percolates down to the water table. The hot water percolates through the bed of cane and removes sucrose from the cane. Since the kalasa is broken rain water percolates from the roof. Rain percolates through the coral during the wet season.