Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/aprchile/public_html/index.php:3) in /home/aprchile/public_html/libraries/joomla/session/session.php on line 423

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/aprchile/public_html/index.php:3) in /home/aprchile/public_html/libraries/joomla/session/session.php on line 423

Warning: Cannot modify header information - headers already sent by (output started at /home/aprchile/public_html/index.php:3) in /home/aprchile/public_html/libraries/joomla/session/session.php on line 426
Analysis and comparison of the wells in the pleasant valley area of ventura county, California
Analysis and comparison of the wells in the pleasant valley area of ventura county, California Imprimir
Viernes, 14 de Enero de 2011 14:43
INTRODUCTION

1.1 Purpose and Scope

.....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.
2.0 PLEASANT VALLEY GROUND-WATER BASIN

.....2.1 Hydrogeology

2.1.1 Shallow Aquifers
.....The upper strata of the Pleasant Valley Basin is composed of recent and Upper Pleistocene alluvial sands, gravels, silts and clays. The aquifers in this zone are generally unconfined and very in thickness from a few feet to several hundred feet. The permeable lenses yield little water to wells owing to rapid thinning and predominance of fine-grained materials. The shallow aquifers in the Pleasant Valley Basin are equivalent but not connected with the Oxnard aquifer lying to the West.

2.1.2 Fox Canyon Aquifer
.....Underlying the Pleasant Valley area at depths from 400 to 1500 feet is a prominent zone of marine sands and gravels known as the Fox Canyon Aquifer. The Fox Canyon Aquifer is the lower-most member of the early Pleistocene San Pedro formation and forms the major producing zone of the Pleasant valley ground-water Basin. The aquifer is confined and is from 100 to 300 feet thick. .Figure 2 is a geologic cross section through the Pleasant Valley Basin along Las Posas Road. As can be seen in the section, the Fox Canyon aquifer is penetrated by most of the high yielding wells in the study area.
DOWNLOAD PDF...