| Photo Gallery |
| General Photos | ||
 Center-pivot irrigation sprinkler |
 Feedlot near Guymon, Oklahoma |
 Ariel view of center-pivot field near Elkhart, Kansas |
 The escarpment created by the relatively resistant High Plains aquifer, viewed from northern Weld Co., Colorado |
 Oil well near Guymon, Oklahoma |
 Outcrop of the Ogallala Formation, the main water-bearing unit if the High Plains aquifer, near the Canadian River in Texas |
 Playa lake; a dominant feature of the High Plains area in the panhandle of Texas |
 An Oklahoma High Plains sunset |
 Harvesting alfalfa near the Cimarron River in Kansas |
 Wheat field; a major crop in the central High Plains area |
 Windmill near Turon, Kansas |
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| Transect Study - central High Plains | ||
 Ariel view of the Cimarron transect site near the Cimarron River in Kansas |
 Developing the Cimarron transect well using air |
 Drilling rig used for drilling transect wells; site near Liberal Kansas |
 Close-up of transect-site drill rig; Cimarron site |
 Core from the Permian red beds that underlie the High Plains aquifer in southwestern Kansas and the Oklahoma panhandle |
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| Unsaturated-Zone Study - central High Plains | ||
 Special drill rig used for drilling the unsaturated-zone study wells. The drill rig is a casing-advance type that brings cuttings to the surface using air rather than fluid. |
 Instrumentation for monitoring the unsaturated zone in the central High Plains |
 Detail of surface-installation at the unsaturated-zone study sites |
 Gas sampling in the mobile water-quality lab |
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| Reconnaissance Study - central High Plains | ||
 Geophysical logging |
 Bailing a well |
 Completed well |
 Set-up for sampling the wells; a mobile water-quality lab and a pickup to hold the pump. |
 Special pump used for sampling wells where there is a large depth to water |
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