Nevertheless, the diagnostic plot is insufficient and must be accompanied by further modelling because of the nonuniqueness of the drawdown log-derivative signal. Here, a diagnostic plot on log-derivative drawdown is used to identify flow regimes and thus aquifer heterogeneities, leading to plausible conceptual models. However, the data fitting can fail and provide only an indication that the pumped aquifer has a complex structure. The study of groundwater resources using pumping test data is usually carried out with the Theis solution, which enables the hydraulic parameters of porous aquifers such as the transmissivity and storage coefficient, to be estimated from the water-level drawdown. Hydrogeology Journal volume 30, pages 283–302 ( 2022) Cite this article Melhorando o conhecimento hidrogeológico por meio da interpretação de testes de poço por gráficos de diagnóstico e modelagem: um estudo de caso em um aquífero aluvial na França Mejora en el conocimiento hidrogeológico a través de la interpretación de ensayos de pozos mediante parcelas de diagnóstico y modelización: un estudio de caso en un acuífero aluvial en Francia An additional pipe, installed for providing thermistor access, allows recording of the geothermal gradient in the well which provides a basis for estimating vertical ground-water movement in the area.Improving hydrogeological understanding through well-test interpretation by diagnostic plot and modelling: a case study in an alluvial aquifer in FranceĪmélioration de la compréhension hydrogéologique grâce à l’interprétation des essais de puits par diagnostic et modélisation: une étude de cas dans un aquifère alluvial en France The pipes also permit chemical quality monitoring of water in the various aquifer zones. In the completed well each aquifer zone is isolated by cement seals, and piezometer pipes installed to zones B through H allow a basis for defining the vertical hydraulic gradient and ground-water movement in the area. The tests indicate that most of the water available to the well is from the deepest aquifer (zone H).īorehole geophysical logging supplemented the drillers log of the well and provided information on natural gamma radiation, water temperature and resistivity, and borehole diameter. Test pumping during drilling showed that the well had specific capacities of (1) 4-8 gpm (gallons per minute) per foot of drawdown when at the 255-foot depth and open to aquifers A through D, (2) 5.6 gpm per foot of drawdown when at the 640-foot depth and open to aquifers A through G, and (3) 76 5 gpm per foot of drawdown when at the full 750-foot depth and open to all eight aquifers. The well was drilled by air-rotary methods and penetrates eight aquifer zones (A through H) the upper 75 feet of the well is cased, and the remainder of the hole is open in basalt. The well provides information on aquifer characteristics in this area which are not available from existing deep irrigation wells. The 750-foot test-observation well drilled near Davenport, Wash., is one of several drilled to date (1972) to provide information on ground-water conditions in selected areas of the State.
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