Which seasonal factor most directly affects the depth of the water table?

Correct answer: Long-term precipitation and infiltration rate

Correct answer: B, long-term precipitation and infiltration rate. The water table is the upper surface of the underground zone in which soil and rock spaces are filled with water. Rainfall supplies water at the land surface. Some of this water flows away as runoff, while some enters the soil and moves downward by infiltration and percolation. That downward movement recharges groundwater and generally raises the water table. During a long dry period, groundwater continues to leave through wells, springs, streams, and natural seepage, but little new water enters; therefore, the water table may fall and become deeper. A, wind direction, can influence evaporation or the movement of clouds, but it is not the direct controlling factor named here. C, ocean tides, mainly affect coastal water locally and do not normally control inland groundwater depth. D, soil colour is an appearance property, not a reliable measure of recharge. Memory cue: more effective rain entering the ground means more recharge; drought usually means a deeper water table.