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The mathematical, three-dimensional, finite-difference, ground-water flow model of the Tesuque aquifer system in northern New Mexico was converted to run using the U.S. Geological Survey's modular ground-water-flow code. Results from the final versions of the predevelopment and 1947 to 2080 transient simulations of the two models are compared. A correlation coefficient of 0.9905 was obtained for the match in block-by-block constanthead fluxes and 0.9845 was obtained for the match in block-by-block headdependent fluxes for predevelopment conditions. There are, however, significant differences in at least two specific cases. In the first case, a difference is associated with the net loss from the Pojoaque River and its tributaries to the aquifer. The net loss by the river is given as 1.134 cubic feet per second using the original ground-water model, which is 38.1 percent less than the net loss by the river of 1.8319 cubic feet per second computed by the new model in this study. In the second case, the large difference is computed for the transient decline in the hydraulic head of a model block near Tesuque Pueblo. The hydraulic-head decline by 2080 is, using the original model, 249 feet, which is 14.7 percent less than the hydraulic head of 292 feet computed by this study. In general, the differences between the two sets of results are not large enough to lead to different.conclusions regarding the behavior of the system at steady state or when pumped. INTRODUCTION The U.S. Geological Survey was requested by the U.S. Bureau of Indian. Affairs to evaluate the effects of that agency's plan for irrigation development within the Pojoaque basin on ground-water levels and streamflow. The results of that evaluation were presented by Hearne (1985). Hearne*s (1985) three-dimensional model simulation of the Tesuque aquifer system used the model code developed by Posson and others (1980). The model code of Posson and others (1980) can no longer be easily used because the code is machine-dependent. Pu rp os e and Scope In 1987, the U.S. Geological Survey, in cooperation with the U.S. Bureau of Indian Affairs, began the present investigation to determine if the Hearne (1985) model could be converted to use the model code developed by McDonald and Harbaugh (1984). The purpose of this report is to show the results of simulations of the original Hearne (1985) model and those of the same model converted to the McDonald and Harbaugh (1984) code. The scope of this report is limited to presenting these results and brief explanations of possible differences in results, if any. The data arrays needed to run the Hearne (1985) model using the McDonald and Harbaugh (1984) code are presented as a supplement to this report (Umari, 1989). Geohydrologic Setting The following brief summary of the geohydrology of the modeled area is taken from Hearne (1985, p. 3-4). A more complete description is available in Hearne (1985). The Tesuque Formation (Santa Fe Group), of Miocene age, underlies the central part of Espanola Basin (Kelley, 1978), including most of the Pojoaque River basin [fig. 1]. The Espanola Basin is one of several interconnected basins that form the Rio Grande depression. The eastern boundary of the basin is the Sangre de Cristo uplift. The western boundary is a complicated fault system, much of which has been covered by volcanic rocks of the Jemez Mountains. The basin is separated from the San Luis Basin to the north and from the Albuquerque Basin to the south by constrictions in the bedrock. * * * The principal aquifer underlying the Pojoaque River basin and vicinity is the Tesuque Formation, which is composed of interbedded layers of gravel, sand, silt, and clay with some intercalated volcanic ash beds. The degree of both sorting and cementation is variable, but the beds are typically poorly sorted and poorly cemented. Two important features of the Tesuque Formation are the dip of the beds and the lack of continuity of the individual beds. * * * Average dip of the beds is estimated to be between 5 and 10 degrees (Kelley, 1952, p. Ill), and toward the west or northwest. * * * Except for the ash beds, the Tesuque Formation was deposited as coalescing alluvial fans [fig. 2], * * * Miller and others (1963, p. 50) report that '* * * few beds can be traced more than a mile or two. 1 The predominantly north-trending faults further disrupt the continuity of individual beds of the Tesuque Formation [fig. 2] . * * * The thickness of the Tesuque Formation is unknown but has been estimated to exceed 3,700 feet in some places (Galusha and Blick, 1971, p. 44). Kelley (1978) estimated that the thickness of the Tesuque Formation may exceed 9,000 feet near the Rio Grande.

u.s. geological survey open file report/open-file report

Conversion and comparison of the mathematical, three-dimensional, finite-difference, ground-water flow model to the modular, three-dimensional, finite-difference, ground-water flow model for the Tesuque aquifer system in northern New Mexico