Water infrastructure and the environment conference, 28 Nov – 2 Dec 2016, millennium hotel, queenstown, New Zealand groundwater recharge estimation in sukhuma district, champasak province, southern Laos: A preliminary assessment

Vongphachanh, S; Milne-Home, W; Ball, JE

Water infrastructure and the environment conference, 28 Nov – 2 Dec 2016, millennium hotel, queenstown, New Zealand groundwater recharge estimation in sukhuma district, champasak province, southern Laos: A preliminary assessment

Vongphachanh, S

Milne-Home, W Ball, JE

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Publication Type:: Conference Proceeding
Citation:: 37th Hydrology and Water Resources Symposium 2016: Water, Infrastructure and the Environment, HWRS 2016, 2016, 2016-November
Issue Date:: 2016-01-01

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Field	Value	Language
dc.contributor.author	Vongphachanh, S https://orcid.org/0000-0001-8012-5943	en_US
dc.contributor.author	Milne-Home, W	en_US
dc.contributor.author	Ball, JE https://orcid.org/0000-0001-8342-1916	en_US
dc.date.issued	2016-01-01	en_US
dc.identifier.citation	37th Hydrology and Water Resources Symposium 2016: Water, Infrastructure and the Environment, HWRS 2016, 2016, 2016-November	en_US
dc.identifier.isbn	9781922107954	en_US
dc.identifier.uri	http://hdl.handle.net/10453/138684
dc.description.abstract	© 2017 Engineers Australia. All Rights Reserved. Southern Laos is undergoing economic and agricultural development, resulting in a large increase in groundwater and surface water use. However, these water resources are not known in detail. This study aims to investigate the groundwater and surface water interactions in the Sukhuma District of Champasak Province using a network of sixteen rain gauges and groundwater levels measurement points. Groundwater levels are measured weekly in eleven domestic wells, which are pumped irregularly, and also in five observation bores. Aquifer recharge occurs from direct infiltration of rainfall and also is derived using baseflow calculated from daily streamflow measurements at the re-established gauging station on the Khamouan River in Sukhuma District. The Khamouan River is connected to the groundwater in its lower reaches in both dry and wet seasons. Baseflow proportion to the total streamflow in the wet season 2015 has been estimated at 46%. The distribution of direct recharge has been mapped with ArcGIS and is spatially variable. Preliminary estimates of rainfall recharge have been calculated by the water table fluctuation method for 2015 but show a high degree of uncertainty related to the specific yield estimates. Time series analysis has confirmed the observed lag of some three to four weeks between the wet season start and rise in groundwater levels. These preliminary results indicate that there is close interaction between groundwater and surface water in the Sukhuma District. Further analysis will refine these results and extend them through remote sensing across southern Laos for application to integrated water resources management.	en_US
dc.relation.ispartof	37th Hydrology and Water Resources Symposium 2016: Water, Infrastructure and the Environment, HWRS 2016	en_US
dc.title	Water infrastructure and the environment conference, 28 Nov – 2 Dec 2016, millennium hotel, queenstown, New Zealand groundwater recharge estimation in sukhuma district, champasak province, southern Laos: A preliminary assessment	en_US
dc.type	Conference Proceeding
utslib.citation.volume	2016-November	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	2016-November	en_US

Abstract:

© 2017 Engineers Australia. All Rights Reserved. Southern Laos is undergoing economic and agricultural development, resulting in a large increase in groundwater and surface water use. However, these water resources are not known in detail. This study aims to investigate the groundwater and surface water interactions in the Sukhuma District of Champasak Province using a network of sixteen rain gauges and groundwater levels measurement points. Groundwater levels are measured weekly in eleven domestic wells, which are pumped irregularly, and also in five observation bores. Aquifer recharge occurs from direct infiltration of rainfall and also is derived using baseflow calculated from daily streamflow measurements at the re-established gauging station on the Khamouan River in Sukhuma District. The Khamouan River is connected to the groundwater in its lower reaches in both dry and wet seasons. Baseflow proportion to the total streamflow in the wet season 2015 has been estimated at 46%. The distribution of direct recharge has been mapped with ArcGIS and is spatially variable. Preliminary estimates of rainfall recharge have been calculated by the water table fluctuation method for 2015 but show a high degree of uncertainty related to the specific yield estimates. Time series analysis has confirmed the observed lag of some three to four weeks between the wet season start and rise in groundwater levels. These preliminary results indicate that there is close interaction between groundwater and surface water in the Sukhuma District. Further analysis will refine these results and extend them through remote sensing across southern Laos for application to integrated water resources management.

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http://hdl.handle.net/10453/138684