Gravity analysis of the subsurface structure of the Upper Santa Cruz Valley, Santa Cruz County, Arizona
Figure 9 - Second Order Residual ...
AuthorParker, Robert Wade
KeywordsGravity -- Santa Cruz River Valley (Ariz. and Mexico) -- Measurement.
Gravity anomalies -- Santa Cruz River Valley (Ariz. and Mexico)
Groundwater -- Santa Cruz River Valley (Ariz. and Mexico)
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Degree GrantorUniversity of Arizona
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Effluent recharge to the Upper Santa Cruz River floodplain aquifer, Santa Cruz county, ArizonaScott, Paul S.; Mac Nish, Robert D.; Maddock, Thomas, III; Department of Hydrology & Water Resources, The University of Arizona; Arizona Research Laboratory for Riparian Studies (Department of Hydrology and Water Resources, University of Arizona (Tucson, AZ), 1997)The City of Nogales, Arizona, is in the Santa Cruz Active Management Area and is subject to the assured water supply and conservation mandates of the 1980, Groundwater Management Act (State of Arizona, 1980). The primary water supply for both Nogales Arizona, and Nogales, Sonora, (commonly referred to as Ambos Nogales) is groundwater pumped from the shallow alluvial aquifers which underlie the Upper Santa Cruz River in Arizona and Mexico, and its tributaries (principally Nogales Wash and Potrero Creek). Nogales, Sonora also obtains water from the Los Alisos Basin, which is south of the Santa Cruz Basin in Mexico (Carruth, 1995). The NIWTP provides wastewater treatment for Ambos Nogales, and discharges treated wastewater to the Upper Santa Cruz River near the confluence with Nogales Wash and Sonoita Creek. The discharge of effluent creates an intermittent stream from the NIWTP outfall for approximately 13 river miles to Tubac, Arizona. The conservation mandates of the 1980, Groundwater Management Act (State of Arizona, 1980) require the City of Nogales, Arizona to prove the existence of a 100-year water supply as a condition for future growth. The Act also allows Nogales, Arizona to receive recharge credits for the portion of effluent that recharges the aquifer underlying the Santa Cruz River. The recharge credits will be used by the City of Nogales as partial proof of a 100-year water supply (Carruth, 1995).
Effluent recharge to the upper Santa Cruz River floodplain aquifer, Santa Cruz County, ArizonaScott, Paul Samuel (The University of Arizona., 1997)The Nogales International Wastewater Treatment Plant (NIWTP) discharges treated wastewater to the Upper Santa Cruz River in Santa Cruz County, Arizona. Results of a study designed to estimate effluent recharge to the floodplain aquifer underlying the river are presented. The study's centerpiece comprised two 48-hour synoptics during which intensive data on water budget components were collected. Complimenting these data were periodic water level readings and sample collections through 1995, a seismic refraction survey, and continuous operation of two meteorological towers. These data in conjunction with historical records were used to construct water budgets for the synoptic runs and for 1995, and to estimate effluent recharge for the conditions experienced during the synoptic runs (21.8 acre-feet/day in June and 0.7 acre-feet/day in December), and for 1995 (3,674 acre-feet). An additional effluent recharge estimate for 1995 (5,806 acre-feet), was made using a chloride and boron mass balance approach. The study also provided a basis for recommendations on the monitoring requirements of a long-term effluent recharge estimation program.
The Santa Cruz River terraces near Tubac, Santa Cruz County, ArizonaHelmick, Walter Robert,1950- (The University of Arizona., 1986)Nine Quaternary surfaces along the Santa Cruz River reflect degradation subsequent to basin filling. Five alluvial-geomorphic surfaces represent stages of aggradation in a net trend of channel downcutting. Upstream of the mountain-bounding fault, longitudinal surface profiles do not converge in a downstream direction and downstream of this zone there are no thicker sediment wedges. This indicates that the mountain front was tectonically inactive and climatic change initiated shifts from aggradation to degradation. Terrace soils indicate that four major climatic changes have occurred in the region. These changes resulted in downcutting events during the early Pleistocene, mid-Pleistocene, late Pleistocene and early Holocene. The timing of last movement on two piedmont faults indicates that they were active during the late Pleistocene. Oxalate to dithionite extractable iron ratios are a maximum for early Holocene soils, declining to minimum values for early Pleistocene soils.