by Dennis E. Williams, Ph.D.

This report compares the production capabilities of a group of high capacity water wells of varying design drilled in the Pleasant Valley Basin near the city of Camarillo, California (see Figure 1). Thirty four wells were chosen for the study and represent different screen types in addition to development and completion methods. The type of screens in the wells range from low open area milled and punched slotted casing to higher open area continuous wire wrap and horizontal louver shutter screen. The total depth and length of screen varies considerably between wells as does the type of aquifer penetrated.

Because of the variety of screen types and development methods, the Pleasant Valley area affords an excellent opportunity to study the relationship between well yields and screen design.

The scope of the investigation included plotting of a typical geologic cross section through the Pleasant Valley aquifers and a computer analysis and comparison of specific capacities per foot of screen for each of the wells.

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