Meeting Info

Information About Phoenix Chapter Meetings

The cost for our monthly dinner meetings has increased for professionals —  it’s now $25  (not $20). Students can still attend for free, and government employees still pay $20. NEW: You can also sponsor a student for $25.

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03/08/2017 05:30 PM
03/08/2017 8:00 PM
Monthly Chapter Dinner Meeting
InSAR and Fissures
Bluewater Grill, 1720 E Camelback Rd.
  • Date: March 8
  • Time: 5:30-6:00 PM, happy hour; 6:00-8:00 PM, dinner and meeting
  • Place: Bluewater Grill, 1720 E Camelback Rd, Phoenix, AZ 85016 [map]
  • Cost: $25 regular, $20 government, free for students, $25 for student sponsorship*
  • RSVP: Beth Proffitt or REGISTER ONLINE*

* If you are paying online and sponsoring a student, please enter “student” and “sponsor” in the first and last name fields during the checkout process.

Abstract: An Update on Arizona Land Subsidence Using InSAR Data by ADWR

Land subsidence due to groundwater overdraft has been an ongoing problem in south-central and southern Arizona since the 1940s. The first earth fissure attributed to excessive groundwater withdrawal was discovered in the early 1950s near Picacho. In some areas of the state, groundwater-level declines of more than 450 feet have resulted in extensive land subsidence and earth fissuring. Land subsidence in excess of 18 feet has been documented in both western metropolitan Phoenix and Eloy.

ADWR’s land subsidence monitoring program has been monitoring land subsidence since 1998 using global navigation satellite system (GNSS). The program has been greatly enhanced by the use of Interferometric Synthetic Aperture Radar (InSAR). ADWR’s InSAR program started in 2002 when the agency was awarded a 3-year NASA Earth Science grant.

In 2005, ADWR began collecting and processing monthly SAR data from the European and Canadian space agency satellites, producing time-series interferograms for the greater Phoenix and Tucson metropolitan areas. Since 2005, the program has developed important partnerships with numerous federal, state, county, and local agencies, water districts, and water companies that provide annual contributions to help support data-collection costs. These partnerships have given ADWR the necessary resources to expand the data collection area for the InSAR program to include numerous groundwater basins in south-central and southern Arizona in Maricopa, Pinal, Pima, La Paz, Graham, and Cochise Counties.

Through these efforts, ADWR has collected more than $1.3 million of InSAR data covering more than 150,000 square miles in Arizona. ADWR has identified more than 27 individual land subsidence features that cover respectively more than 2,900 square miles and has determined the spatial extent, deformation rates, and time-series history of each land subsidence feature with the InSAR data.  The process of collecting, processing, and interpreting InSAR data has resulted in ADWR producing a total of 366 maps for all the land subsidence features covering different time periods.

Engineers, hydrologists, geologists, GIS professionals, and scientists involved in the fields of water resources, structural engineering, geological engineering, hydrological engineering, land planning, floodplain management, and surveying greatly benefit from the InSAR data to identify and evaluate areas of land subsidence, uplift, earth fissures, faults, and many other geologic features.

Speaker: Brian D. Conway, ADWR

Brian Conway earned his bachelor’s degree in environmental science from Creighton University in Omaha, Nebraska, in 1997. He attended the UA’s masters of hydrology program from 1998 to 2001. Brian has worked for ADWR since 1999, starting out as an intern and working his way up from an entry-level hydrologist in the Hydrology Division’s Geophysics / Surveying Unit, which he has supervised since 2006. The Geophysics / Surveying Unit is responsible for monitoring land subsidence in Arizona using InSAR and conducting gravity surveys to monitor changes in aquifer storage and gravity modeling to determine groundwater basin depth-to-bedrock, basin geometry, and groundwater-in-storage estimates.

Looking Ahead…

If you would like to do a presentation at a future Phoenix Chapter meeting or if you know someone else who could use an audience, please contact Stephen Flora.

News from the Phoenix Chapter

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