Permitted irrigation wells
Figure 8-6 shows the distribution of irrigation permits in the WBRB, permits issued before and after 2000, and TWE permits. Most irrigation wells are located in rural areas and along rivers and other surface drainages where Quaternary and Tertiary hydrogeologic units can provide adequate groundwater for this high-volume use. The depth vs. yield tables on Figure 8-6 show that while permits have been issued for all depth categories, most groundwater permits are for depths of 50 feet or less or for more than 1000 feet, across a wide range of yields for both total permits and permits issued since 2000. For permits since 2000, most permitted yields have been for 500 gpm or less. More than half of the irrigation-use permits are coded or have no recorded depth; 8 have coded yield information. TWE permits do not include depth data.
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