Next Article in Journal
Heterotrophic Kinetic Study and Nitrogen Removal of a Membrane Bioreactor System Treating Real Urban Wastewater under a Pharmaceutical Compounds Shock: Effect of the Operative Variables
Next Article in Special Issue
Method for Identifying and Estimating Karst Groundwater Runoff Components Based on the Frequency Distributions of Conductivity and Discharge
Previous Article in Journal
Role of Groundwater-Borne Geogenic Phosphorus for the Internal P Release in Shallow Lakes
Previous Article in Special Issue
Control Effects of Hydraulic Interception Wells on Groundwater Pollutant Transport in the Dawu Water Source Area
Open AccessArticle

The Well Efficiency Criteria Revisited—Development of a General Well Efficiency Criteria (GWEC) Based on Rorabaugh’s Model

1
Department of Geological Engineering, Muğla Sıtkı Koçman University, 48000 Muğla, Turkey
2
Center for Environment and Waters, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
3
Zetas Zemin Teknolojisi A. S., Alemdağ Merkez Mah. Reşadiye Cad. No: 69/A, 34794 Istanbul, Turkey
4
University of Poitiers, UMR CNRS IC2MP, 86000 Poitiers, France
*
Author to whom correspondence should be addressed.
Water 2019, 11(9), 1784; https://doi.org/10.3390/w11091784
Received: 7 July 2019 / Revised: 12 August 2019 / Accepted: 22 August 2019 / Published: 27 August 2019
(This article belongs to the Special Issue Advances in Hydrogeology: Trend, Model, Methodology and Concepts)
The Strategic Water Storage & Recovery (SWSR) Project in Liwa, Abu Dhabi is a leading and unique hydrogeology project in the world because of both its financial and scientific dimensions. The objective of the project is to store desalinized water in the local Liwa aquifer, to be able to supply water to Abu Dhabi in case of emergency. A total of 315 recovery wells have been drilled in pursuance of the scope of the SWSR project. Out of the total 315 wells, 25 wells met construction problems and were removed from the study. The remaining 290 wells have been analyzed using step drawdown tests (SDTs) and the model of Rorabaugh. This provided a large and unique database regarding the parameters of this model: linear aquifer-loss coefficient (B), non-linear well-loss coefficient (C) and the exponent p. Analysis of this exceptional data set revealed noteworthy and novel findings: (1) the range of the exponent p values is found to be very extensive, varying from 0.35 to 6.01. For comparison, the highest values of p given in the literature very seldom exceed 4; (2) p behaves like a lognormal variable; (3) parameters C and p are closely correlated. A semi-logarithmic diagram displays a linear relation of p vs. log C, with a determination coefficient R2 = 0.83; (4) A graphical and tabulated procedure, termed General Well Efficiency Criteria, is proposed to assess well efficiency. Given the very wide range of p values implied in this procedure, it becomes possible thus to assess the efficiency of any well analyzed with an SDT. This study finally raises questions about Jacob’s model validity, which assumes that p is constant and equal to 2. View Full-Text
Keywords: step drawdown tests; well efficiency; Rorabaugh model; Jacob model; Strategic Water Storage & Recovery Project; Liwa aquifer; Abu Dhabi; General Well Efficiency Criteria step drawdown tests; well efficiency; Rorabaugh model; Jacob model; Strategic Water Storage & Recovery Project; Liwa aquifer; Abu Dhabi; General Well Efficiency Criteria
Show Figures

Figure 1

MDPI and ACS Style

Kurtulus, B.; Yaylım, T.N.; Avşar, O.; Kulac, H.F.; Razack, M. The Well Efficiency Criteria Revisited—Development of a General Well Efficiency Criteria (GWEC) Based on Rorabaugh’s Model. Water 2019, 11, 1784.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop