3 August 1998
b. Special Considerations. In some geologic environments, the aquifer may be too thin or
for some other reason is unable to provide the required quantity of water to a standard vertical
well. In such instances, it may be economical to install collector wells. A collector well is
typically constructed with a large caisson having one or more horizontal screens extending into
the saturated zone (figure 5-2). The caisson can be used as a storage tank. The
disadvantage of this system is that collector wells are more expensive than standard vertical
Figure 5-2. Collector Well.