Figure 3-8 shows the front positions at two different times during recovery. At
every time increment an angle 0 can be determined where the value of rr.=0. The
fraction of ambient groundwater in the water recovered from ASR well is then calculated
as:
F = (3-22)
360
where:
/ = 2( 0) (3-23)
The concentration of recovered water is then calculated from equation (3-24):
CR= FCA + (1- F)CJ (3-24)
In equation (3-24), CA is concentration of ambient water [M/L3] and CI is
concentration of injected water [M/L3].
Direction of Regional /
Groundwater Flow L
ASR Well
Figure 3-8. Position of the interface at two different times during recovery.
Usually there is a storage time at the end of each cycle and then a new cycle of
injection, storage, and recovery begins. The coordinate system of each point at the end of
first cycle will be the initial coordinate for the second cycle. This process continues for
the other cycles during operation of the ASR system.