Clogging of groundwater abstraction wells is a
common phenomenon, so common that it is often
considered inevitable. However, by determining
whether the clogging is chemical or mechanical,
and by using operation procedures specific to each
type of clogging phenomenon, groundwater
abstraction can be significantly more reliable and
cost-effective. This article examines how to diagnose
and to mitigate screen slot (chemical) clogging
and well bore (mechanical) clogging.
Screen slot clogging is evidenced by increasing
entrance resistance, the difference in head
between the abstraction well and the observation
well in its gravel pack. Continuous operation of
the well will prevent this problem. Well bore clogging
is evidenced by an entrance resistance that
does not increase over time. Alternating well operation
and idle periods will prevent clogging in
these instances. Applying the results and recommendations
of this research can help water providers
avoid the extra costs associated with
clogged wells, which the authors estimate can be
up to $6,500 per well for monitoring, regeneration,
and replacement. Includes 26 references, table, figures.
| Edition : | Vol. 101 - No. 4 |
| File Size : | 1
file
, 1.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 04/01/2009 |
