Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology

The semi-arid interior dryland region in south-central Chile is characterized by shrink-swell granitic soils and a semi-arid Mediterranean climate, which together cause scarce dry-season surface water supplies. Historically, the lack of easily accessible water has limited the region’s econ...

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Autores principales:	Uribe,Hamil, Rupp,David E, Arumí,José Luis, Stewart,Ryan D, Selker,John S
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2014
Materias:	Groundwater recharge hydraulic conductivity interior dryland slug test water usage well capacity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392014000200014
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spelling	oai:scielo:S0718-583920140002000142018-10-01Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodologyUribe,HamilRupp,David EArumí,José LuisStewart,Ryan DSelker,John S Groundwater recharge hydraulic conductivity interior dryland slug test water usage well capacity The semi-arid interior dryland region in south-central Chile is characterized by shrink-swell granitic soils and a semi-arid Mediterranean climate, which together cause scarce dry-season surface water supplies. Historically, the lack of easily accessible water has limited the region’s economic development. In most of the region’s rural communities, the only local water supplies for drinking and small-scale irrigation are shallow, hand-dug wells. The objectives of this study, conducted in the San José catchment in the Biobío Region (36°24’ S, 72°30’ W), were to demonstrate the usefulness of a simple aquifer characterization methodology to assess the likelihood of additional extraction of groundwater in this area with existing wells, estimate potential increases in productivity through increases in well depth, and present the spatial distribution of aquifer properties in this area. Hydraulic conductivity values (Ks) were measured from analyses of recovery rates of hand-dug wells. Values of Ks ranged between 0.04 and 5.1 m d-1 (mean = 1.07 m d-1; standard deviation = 1.36 m d-1), which resulted in a low yield from the shallow wells. These Ks values were used to estimate the potential groundwater yield which could be extracted from hand-dug wells in the region in their current condition with increased pumping and, where feasible, if wells were deepened by 0.5 m. Results suggested that existing wells could produce up to 0.008 m yr-1 and up to 0.02 m yr-1 by deepening them. Since current water usage has been estimated as 0.002 m yr-1, these results suggest that additional groundwater supplies could be exploited.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.74 n.2 20142014-04-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392014000200014en10.4067/S0718-58392014000200014
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Groundwater recharge hydraulic conductivity interior dryland slug test water usage well capacity
spellingShingle	Groundwater recharge hydraulic conductivity interior dryland slug test water usage well capacity Uribe,Hamil Rupp,David E Arumí,José Luis Stewart,Ryan D Selker,John S Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology
description	The semi-arid interior dryland region in south-central Chile is characterized by shrink-swell granitic soils and a semi-arid Mediterranean climate, which together cause scarce dry-season surface water supplies. Historically, the lack of easily accessible water has limited the region’s economic development. In most of the region’s rural communities, the only local water supplies for drinking and small-scale irrigation are shallow, hand-dug wells. The objectives of this study, conducted in the San José catchment in the Biobío Region (36°24’ S, 72°30’ W), were to demonstrate the usefulness of a simple aquifer characterization methodology to assess the likelihood of additional extraction of groundwater in this area with existing wells, estimate potential increases in productivity through increases in well depth, and present the spatial distribution of aquifer properties in this area. Hydraulic conductivity values (Ks) were measured from analyses of recovery rates of hand-dug wells. Values of Ks ranged between 0.04 and 5.1 m d-1 (mean = 1.07 m d-1; standard deviation = 1.36 m d-1), which resulted in a low yield from the shallow wells. These Ks values were used to estimate the potential groundwater yield which could be extracted from hand-dug wells in the region in their current condition with increased pumping and, where feasible, if wells were deepened by 0.5 m. Results suggested that existing wells could produce up to 0.008 m yr-1 and up to 0.02 m yr-1 by deepening them. Since current water usage has been estimated as 0.002 m yr-1, these results suggest that additional groundwater supplies could be exploited.
author	Uribe,Hamil Rupp,David E Arumí,José Luis Stewart,Ryan D Selker,John S
author_facet	Uribe,Hamil Rupp,David E Arumí,José Luis Stewart,Ryan D Selker,John S
author_sort	Uribe,Hamil
title	Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology
title_short	Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology
title_full	Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology
title_fullStr	Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology
title_full_unstemmed	Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology
title_sort	assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central chile using an analytical methodology
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392014000200014
work_keys_str_mv	AT uribehamil assessmentofcurrentandpotentialyieldofhanddugwellsinasemiaridzoneinsouthcentralchileusingananalyticalmethodology AT ruppdavide assessmentofcurrentandpotentialyieldofhanddugwellsinasemiaridzoneinsouthcentralchileusingananalyticalmethodology AT arumijoseluis assessmentofcurrentandpotentialyieldofhanddugwellsinasemiaridzoneinsouthcentralchileusingananalyticalmethodology AT stewartryand assessmentofcurrentandpotentialyieldofhanddugwellsinasemiaridzoneinsouthcentralchileusingananalyticalmethodology AT selkerjohns assessmentofcurrentandpotentialyieldofhanddugwellsinasemiaridzoneinsouthcentralchileusingananalyticalmethodology
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Assessment of current and potential yield of hand-dug wells in a semi-arid zone in south-central Chile using an analytical methodology

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