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Colorado State University (1992)

Assessment of the potential of underground dams as irrigation water supply in semi-arid regions

Albuquerque Filho, José Lins de

Titre : Assessment of the potential of underground dams as irrigation water supply in semi-arid regions

Auteur : Albuquerque Filho, José Lins de

Université de soutenance : Colorado State University

Grade : Doctor of Philosophy (Ph.D.) 1992

Underground dams, consisting of the placement of an impervious barrier across the alluvium of ephemeral streams, in order to trap and store alluvial flows for later use, represent an alternative water supply for semi-arid regions. Although a number of these dams have been built in Northeastern Brazil, the lack of investigation of their performance under intensive use has prevented their inclusion in the list of feasible alternatives for the region. To fill this gap, the evaluation of the operation of an underground dam was carried out, to assess its potential as a water supply for irrigation in the semi-arid region. The Palhano River Basin, representative of the Brazilian semi-arid, was used as basis for the analysis, to serve as a reference for other semi-arid areas. Irrigation was assumed as the sole purpose for the reservoir, with the operation of a single pump. The maximum irrigated areas, estimated for monthly rainfalls with 50, 67, 75, 80 and 95% exceedance probabilities, were used as indicators of potential reservoir yields. Recharge to the aquifer was evaluated to determine the effectiveness of the different sources of input to reservoir. Losses were estimated to assess the storage efficiency of the reservoir. The assessment was carried out using the Colorado State University Finite Difference Model (CSUFDM), a 2-dimensional deterministic groundwater simulation model, using hydrologic inputs with different levels of exceedance probability, to account for the hydrologic uncertainties. The use of a rainfall-runoff model, the Soil Moisture Accounting Procedure Model (SMAP), was required in order to generate the missing streamflow data. The study established a methodology for the assessment of the underground dams, and concluded that they are capable of providing a reliable water supply under the critical conditions of semi-arid regions, even though the limited well yields are not compatible with the irrigation of large areas. The findings indicate that these reservoirs deserve to be included among the conventional alternatives for the region

Mots Clés : Irrigation water ; Groundwater ; Stochastic processes

Présentation : Search Oxford Libraries On Line (SOLO)

ProQuest : Dissertations & Theses

Page publiée le 29 octobre 2012, mise à jour le 17 novembre 2018