# Check 17 - Check of vertical leakage over polygon tool

##### Checks the Vertical Leakage over Polygon Area tool

This model has two levels, one domain in each level. The domains are circular with radius R = 100 [L]. The specified top flux (recharge) = 0.01 [L^2/T]. So the total vertical flux into the top of the model = pi * R^2 = 314.159 [L^3/T].

There is a well at the center of the circle pumping at a rate of 300 [L^3/T].

The upper level has a specified head boundary around its perimeter, and the lower level has a no-flow boundary around its perimeter.

Using the Vertical Leakage over Polygon Area tool for the area of the whole model gives 312.3 entering the top of the model, and 299.4 entering the lower level of the model. These are close to the ideal values, and differences are due to the numerical integration scheme employed by the tool; rates are evaluated at points, multiplied by representative areas, and summed.