Satellite-based tech employed
by Arizona Water Resources has found more than 3,400 square miles of land
subsidence in the state
Land subsidence is the result of decades of excessive groundwater withdrawal that exceeds natural recharge, resulting in declining groundwater levels. As the groundwater declines, the pore spaces within the aquifer that were once supported by water pressure start to collapse, resulting in subsidence of the ground surface.
In Arizona, land subsidence has produced 167 miles of mapped earth fissures, according to data provided by the Arizona Geological Survey (AZGS). Fissures frequently damage infrastructure: roads, canals, pipelines, railways, buildings, and highways. Land subsidence also has changed the natural drainage slopes, causing areas to flood that hadn’t flooded in the past. It has reversed flood control canals, changed aquifer properties, and led to the permanent loss of groundwater storage due to compaction. ADWR has detected more than 3,400 square miles of land subsidence (see: subsidence areas in salmon, above).
Image Source: Geoscience Australia