What effect does construction of building and roads have on water percolation through the soil? hence what effect woud it have on the water table?
The construction of buildings and roads are gradually covering the open part of the soil with concretes. As a result the rain water run offs fail to percolate (movement of water) through the soil.
Water table is the upper level of an underground surface beneath which rocks and soil are completely emerged under water. The runoff water percolates through the soil and reaches the layer of ground water. As a result the water level of the water table rises up.