CAPTURE

CAPTURE performs the following tasks based on equations that are presented in Bear and Jacobs (1965) and Kasenow (2010). These equations assume zero recharge, uniform aquifer properties and a non-zero hydraulic gradient.

• Calculates the infinite-time capture zone of an extraction well.
• Calculates travel times to the extraction well from points within this zone.
• Repeats these calculations for many stochastic realizations of:
  • hydraulic conductivity;
  • porosity;
  • groundwater gradient;
  • groundwater gradient direction.
• After performing these calculations, CAPTURE records probabilities, evaluated over a grid, that the travel time is less than a user-specified threshold in a number of different files.
• Optionally, CAPTURE records stochastic travel times at user-supplied observation points so that travel time histograms can be constructed at these points.

All CAPTURE outputs are recorded using real-world coordinates. Hence they can be overlain on maps and images of a study area.