This simple basin has a single trunk stream that drains to a lake which is also the ground-water outflow for the basin. Sediments with fairly abrupt increases in hydraulic conductivity illustrated by darkening color are surrounded by extremely low permeability bedrock. Flow is generally oriented toward the stream with some components parallel to the stream, in the direction of the lake. The southern well field and the ranch well at the "??" have been in existence for a long time. A new well field is proposed in the north and the concern is what impact this will have on the ranch well.



A very simplistic grid would be oriented north/south and have large uniform cell sizes (in this case 20x20). Many of the cells would lie outside of the model domain. Hydraulic features and boundaries would be placed in the grid cells in an approximate manner.