In Saudi Arabia a recharge of 114 to 240 MCM (equivalent to 4.434 to 19.2 mm/yr35) has been estimated. Groundwater flow across the political border has presumably been disrupted by the heavy abstraction in the Sa'dah-Najran area since the late 1970s. However, available data does not reveal the impact of this cone of depression on the groundwater dynamics of the aquifer system.