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<br />C'16 4 <br /> <br />system, but would not be necessary to improve the quantification oflhe system, is prioritized as <br />useful. The essential and us.eful activities and information identified are summarized below. <br /> <br />Essential Activities and Information <br /> <br />Install additiomil observation wells. <br /> <br />Measure the vertical distribution of hydraulic heads in the aquifer system and maintain a <br />computerized data baseoflhe measurements <br /> <br />Measure volume and three-dimensional location of ground-water withdrawals, and <br />maintain a computerized data base of the measurements <br /> <br />MeasureJlow of the Rio Grande, canals, and drains at sections near river gages and maintain <br />a computerized data base of the measurements <br /> <br />Documentchanges in the volume of water in aquifer storage <br /> <br />Monitor elastic and inelastic compaction <br /> <br />Estimate riverbed hydraulic conductivity <br /> <br />Define canal dimensions, bottom elevations, operating stage, percentage oftime containing <br />water, and location of lined or unIinedsegments <br /> <br />. Define drain dimensions and bottom elevations (if water table is below bottom and if used <br />for water conveyance) <br /> <br />Estimate vertical and horizontal hydraulic conductivity in the aquifer <br /> <br />CaIctiIate seepage rates'between the.Rio.Grande.and the aquifer <br /> <br />Determine distribution ohilts and days in the inner valley alluvium <br /> <br />DocumeIi.t current (duringUfe of prOject) changes to land uses (such as irrigated land), land <br />covers {such as riparianvegetation),andinnervalley surface-water features (such as <br />the Rio' GrandelcanaIldrainsystem) <br /> <br />Useful Activities and Information <br /> <br />. Classifylithofades units andfaultIocationsinaquiferdeposits beyond the Albuquerque <br />area and estimate influence offatiIts on ground,water flow <br /> <br />Chemically analyze groundwater, including environmental isotopes <br /> <br />Estimate basin, margin and trlbutaryrecharge <br /> <br />Determine rate of evapotram;piration by,ccottonwoods and'its relation to water-table depth <br /> <br />Hydrologicrelations.between the'Rio Grande surface-water system and the aquifer system <br />is complex in the interaction of hydrologic boundary conditions, aquifer materials, aquifer <br />.stresses, . and .system responses. A 'ground-water-flow . model can help. understand these <br />complexities, and estimate the effects of particular stresses on the aquifer and river system. The <br />recently developed ground-watercfIow model oftheAIbuquerque Basin (Kernodle and others, <br />'1995) can be a basis Jor developing this capability. The. collection of additional information on <br />the components of the riverlaquifer system outlined. in this report can be used to update and <br />adjust theground-water-flow model. The model can then be used to quantifyground,water and <br />surface-water relations and to estimate the effects of ground-water withdrawal on flow in the Rio <br />Grande. <br /> <br />The "Plan of study" section ofthe report presents a prioritized series of .study elements <br />,designed to collect the additional essential and useful information. The study elements . are <br /> <br />,vii <br />