Hydraulic Characteristics of Fractured and Jointed Rocka

Abstract
Hydrogeologic studies in foothill watersheds have included diamond‐core drilling, installation of observation wells, and pumping tests. Detailed study of recovered cores has provided reasonable estimates of porosity. Pumping tests of the two‐inch diameter wells have given estimates of the transmissibilities ranging from 6 to 600 gallons per day per foot. Test data from several wells indicate that the hydraulics of water movement in jointed rock systems is not governed by the usual mathematical models.