Evaluation of well rehabilitation

Samirahmed Iqbalahmed Mirza

Master's thesis

Abstract:

Pumping test of the well located at Radouň in Czech Republic is evaluated to check the success of well rehabilitation process. The rehabilitation is a very useful process to increase life span of well and improve performance. Jacob method for pumping test is used as it is simplification of Thies method to find the parameters of an aquifer such as the storativity and the transmissivity. The drawdown vs time interval data is advocated to estimate the transmissivity and observation well data is recommended to estimate the storativity. The well is situated at Snedovice (Radouň) in the district of Usti nad Labem of Czech Republic which was built in 1975. The pumping test is conducted for long duration and two semi-log lines are obtained of drawdown vs time for pumping and observation well.The study investigates the pressure drop in terms of additional drawdown in the well due to additional resistances that is estimated before and after rehabilitation process takes place. The additional resistances caused by skin effect for both the cases have been calculated by comparing actual well data with ideal well condition. The resulted difference between additional drawdown before and after rehabilitation is positive which indicates the success of rehabilitation process.

Keywords

Additional resistances, pumping test, rehabilitation, skin effect, well

Language used: English

Date on which the thesis was submitted / produced: 18. 4. 2016

Thesis defence

• Supervisor: prof. Ing. Pavel Pech, CSc.

Czech University of Life Sciences Prague

Faculty of Environmental Sciences

Master programme / field:
Landscape Engineering / Land and Water Management