Prescribed Head

Prescribed Head

What is it?

A prescribed head boundary condition assigned to a zone utilizes the surface stage to assign the hydraulic head in the adjacent aquifer model cells.

How to use it:

Check the radio box next to ‘Prescribed Head:’ to treat the zone as a prescribed head boundary condition. The head can be assigned as:

- a constant value that does not change with time – select the radio button next to ‘Constant:’ and enter the desired value;
- a constant value that is time-varying – after selecting the radio button next to ‘Constant:’, check the radio box next to the ‘Transient’ button
- the aquifer top elevation minus some prescribed value; by default, the stage is set to the aquifer top elevation, as indicated by the value of zero in the text box next to ‘Top E

To assign time-varying head, check the radio box next to the ‘Transient’ button, and then LM click the ‘Transient button. This opens the ‘Transient Data for Prescribed Head’ sub-menu