Major aquifers, well yields, estimated natural recharge, estimated water in storage, number of index wells and date of last water-level sweep are shown in Table 6.6-6. Figure 6.6-7 shows aquifer flow direction and water-level change between 1990-1991 and 2003-2004. Figure 6.6-8 contains hydrographs for selected wells shown on Figure 6.6-7. Figure 6.6-9 shows well yields in five yield categories. A description of aquifer data sources and methods as well as well data sources and methods, including water-level changes and well yields are found in Volume 1, Appendix A.
As shown on Figure 6.6-9, well yields in this basin range from less than 100 gallons per minute (gpm) to greater than 2,000 gpm.
One source of well yield information, based on 53 reported wells, indicates that the median well yield in this basin is 650 gpm.
Water in Storage
Click for Table 6.6-6 Groundwater Data for the
Virgin River Basin
Click for Figure 6.6-7 Virgin River Basin Groundwater Conditions
Click for Figure 6.6-8 Virgin River Basin Hydrographs Showing Depth to Water in Selected Wells
Click for Figure 6.6-9 Virgin River Basin Well Yields