An aquifer recharge valve assembly comprises a valve movable along the
interior of a pipe section to open and close aquifer recharge openings
through the pipe section. The position of the valve controls the extent
to which the recharge openings are available for delivery of recharge
water into the aquifer. The valve may be a seamless resilient cylinder
which expands due to well head pressure to assist in sealing the recharge
openings when the valve is closed.