The document discusses the unintended consequences of rangeland water conservation structures in the Altar Valley in southern Arizona. It finds that of the 394 structures inventoried, 48% of long earthen berms and 18% of water spreader berms are breached or flanked. These legacy structures have led to problems like gullying, erosion, and hydrologic connectivity that concentrate flow. Similar issues are seen at other sites like Indian Gardens and Ft. Thomas Wash with their rock contour berms. While repairing, maintaining or removing some structures could help, there are also constraints like funding, historic preservation laws, and changes in land use that must be considered. Very high resolution topographic data is needed to accurately model