Rehabilitation of Water Wells

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by Maurice E. Ford, Jr.,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage:

Abstract: The main causes of declining well yield are biological growths, mechanical clogging and chemical encrustation. Because the treatment of the causes of encrustation and clogging is expensive and differs in each case, it is highly advisable to identify the specific cause before proceeding. Diagnostic measures to determine the cause of declining well yield consist of maintaining accurate and thorough records of well construction and performance including frequent measurement of the well specific capacity. Other measures are down hole photography and television, surging and pumping or scraping and bailing to attempt to dislodge clogging matter, pump testing, identification of interfering wells and review of trends in regional water levels. Major categories of treatment (well stimulation) are surging, shooting, vibratory explosion, acidization and chlorination, and hydraulic fracturing. Additional aspects of the subject are discussed.

Subject Headings: Fouling | Pumping tests | Wells (water) | Chemicals | Diagnosis | Hydraulic fracturing | Rehabilitation | Biological processes |

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