Wells#

There are two types of wells: wells for which the total discharge is specified and wells for which the head inside the well is specified. Both types of wells may have an entry resistance (skin effect) defined by the resistance \(c\) (dimension: time). The discharge \(Q_i\) in layer \(i\) is a function of the head \(h_i\) in layer \(i\) just outside the well and the head \(h_w\) inside the well:

\[Q_i = 2\pi r_w H_i(h_i - h_w)/c\]

  1. Well is a well for which the total discharge is specified. The total discharge is distributed across the layers in which the well is screened such that the head inside the well is the same in each screened layer.

  2. HeadWell is a well for which the head inside the well is specified. The discharge in each layer is computed such that the head in all screened layers is equal to the specified head.

  3. TargetHeadWell is a well that produces a specified head at a target point, with the well discharge computed to meet that target.

  4. WellString is a series of connected wells with equal head inside and a specified total discharge.

  5. HeadWellString is a series of connected wells with specified equal head inside all wells.

  6. TargetHeadWellString is a series of connected wells with equal head inside and a specified head at a target point.