Determination method for descending water recharge water amount under rainfall recharge coupling effect of confined aquifer

The invention relates to a method for determining the descending water recharge water amount under the rainfall recharge coupling effect of a confined aquifer. The method comprises the steps that (1) the stratum condition, the site condition and the rainfall recharge requirement are determined; (2) calculating an equivalent large well radius of a precipitation area and an equivalent large well radius of a recharge area according to site conditions by an area equivalence principle; (3) the rainfall recharge water amount is preliminarily calculated; (4) determining a preliminary well spacing scheme according to the preliminary calculation result of the precipitation and recharge water amount, wherein the preliminary well spacing scheme comprises the number and positions of precipitation wells and recharge wells; (5) calculating an equivalent distance between the precipitation well point group and the recharge well point group according to the specific positions of the precipitation well and the recharge well; a