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Estimation of Aquifer Parameters of Limestone Aquifers – A Case Study in Thirunelvely and Kondavil of the Jaffna District

Authors:

CS de Silva ,

Open University of Sri Lanka, LK
About CS

Prof C.S De Silva is the Professor in Agricultural and Plantation Engineering, Department of Agricultural and Plantation Engineering, The Open University of Sri Lanka. She has obtained B.Sc (Agriculture) honors degree from the Faculty of Agriculture, University of Peradeniya with a second class and M.Phil in Agricultural Engineering from the Postgraduate Institute of Agriculture, University of Peradeniya and Ph.D degree on Agricultural Water Management from Cranfield University, UK. Since then she has published over 90 publications in the National and International journals and presented in national and international conferences. Her research work is mainly on groundwater resources management and climate change impacts.

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T Mikunthan

Open University of Sri Lanka, LK
About T

Ms T. Mikunthan is a senior lecturer in the Department of Agricultural Engineering in the Faculty of Agriculture of the Jaffna University and just completed her Ph.D under the supervision of Prof C.S De Silva. Her Ph.D study was on Shallow Groundwater Resources Assessment in Miocene Limestone aquifer in the Jaffna Peninsula as a case study in Kondavil and Thirunelvely. She is also having and M.Phil in Agricultural Engineering, Postgraduate Institute of Agriculture, Peradeniya.

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Abstract

The productiveness of an aquifer is determined by its aquifer parameters such  as specific yield and permeability. Due  to the  complicated features of the  large diameter wells and inadequate resources to conduct pumping tests in observation bore  holes, estimating aquifer parameters for better  use and management of groundwater resources is extremely difficult. The conventional pumping test; distance drawdown method was not possible in the  Chunnagam limestone aquifers to determine the  above said parameters because there was no drawdown in observation boreholes even at 3 m distance. Hence, alternatively the  single well test was performed in specific places; Thirunelvely and Kondavil. The  water level measurements were made by a dip water meter  with respect to time during the  pumping and recovery phase. A semi-log plot of field drawdown data versus time  is made to evaluate the  transmissivity of the aquifer. The relationship  between residual drawdown and time  was used to find the  specific yield. The radial flow numerical model previously used to estimate aquifer parameters using large diameter wells in the  dry zone of Sri Lanka was used to compare the  results obtained by the  single well test in the  study area. The hydraulic conductivity and specific yield estimated by the  single well test agrees with the  values obtained by the radial flow numerical model when the  model results were matched with the field results. Therefore the  single well test in the  large diameter wells is reliable and cost effective to estimate aquifers parameters in limestone aquifers when observation bore  hole  data is not  available. The transmissivity value of the  Thirunelvely area  was  higher (274.88 m2/day) when compared with Kondavil (126.5 m2/day) and the  specific yield was 0.221  and 0.201  respectively in the  Thirunelvely and Kondavil areas.

DOI: http://dx.doi.org/10.4038/ouslj.v6i0.4115

OUSL Journal (2010) Vol. 6, (pp. 75- 90)

Keywords: Limestones 
How to Cite: de Silva, C. & Mikunthan, T., (2010). Estimation of Aquifer Parameters of Limestone Aquifers – A Case Study in Thirunelvely and Kondavil of the Jaffna District. OUSL Journal. 6, pp.75–90. DOI: http://doi.org/10.4038/ouslj.v6i0.4115
Published on 25 Feb 2010.
Peer Reviewed

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