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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Groundwater level trend analysis using the statistical auto-regressive HARTT method
Hydrological Research Letters, Vol.14(1), pp.17-22
2020
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Abstract
In this study, the Hydrograph Analysis: Rainfall and Time-Trends (HARTT) model was used to determine the contribution of climatic and non-climatic stresses on groundwater levels in the Lake Haramaya well-field, Ethiopia. Monthly precipitation and monitored water-level data were used as explanatory variables of the method. Variability in rainfall explained 81.3% of groundwater levels using 2-month average time-delay. The coefficient of the impact of rainfall on groundwater level (K1) was found to be 0.00562 ± 0.0007 mm. This K1 value indicates that a 1 mm increase in rainfall from the annual average rainfall raises the groundwater-level by 0.00562 ± 0.0007 mm, while 1 mm decrease in rainfall causes a 0.00562 ± 0.0007 mm drop in groundwater-level in the area. However, the average falling trend of the groundwater level (K2) was 1.51 ± 0.133 m/year, even with rainfall causing water-levels to rise between 1.01 to 3.29 m/year. With decreased rainfall, rainfall accounted for about 19.5% of the total-drawdown, while 80.5% was due to cumulative effects of non-climatic variables. This shows that rainfall inputs are negated by cumulative non-climatic stresses leading to the long-term net decline in groundwater level. Projected water-level results show that groundwater levels will be below pumping positions in <24 years which may have dire consequences for local landowners.
Details
- Title
- Groundwater level trend analysis using the statistical auto-regressive HARTT method
- Creators
- Guesh Zeru - School of Water Resource and Environmental Engineering, Haramaya University, EthiopiaTena Alamirew - Water and Land Resource Center, Addis Ababa University, Addis Ababa, EthiopiaHaile A. Shishaye - Southern Cross UniversityMegersa Olmana - Tshwane University of Johannesburg, South AfricaNata Tadesse - Mekelle University, Mekelle, EthiopiaMichael J Reading - Southern Cross University
- Publication Details
- Hydrological Research Letters, Vol.14(1), pp.17-22
- Publisher
- Japanese Association of Groundwater Hydrology
- Identifiers
- 991012926979002368
- Copyright
- © The Author(s) 2020. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
- Academic Unit
- Faculty of Science and Engineering; School of Environment, Science and Engineering; Southern Cross GeoScience
- Language
- English
- Resource Type
- Journal article