Wells

Wells may be defined by specifying the discharge of the well or by specifying the (desired) head inside the well. 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, and the aquifer thicknes \(H_i\) of layer \(i\):

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

The following types of wells are implemented:

1. Well is a well for which the total discharge is specified. The discharge may be continuous between specified times or may be a slug. 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. Skin effect and wellbore storage may be included.

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. Skin effect may be included.