Subsurface Injection of Storm Water Runoff into an Underground Storage of Bangkok

Ramnarong, Vachi; ,

Subsurface Injection of Storm Water Runoff into an Underground Storage of Bangkok

by Vachi Ramnarong, Dep of Mineral Resources, Thailand,

Document Type: Proceeding Paper

Part of: Artificial Recharge of Ground Water

Abstract:

Subsurface injection through a well into sand and gravel formations of the Bangkok aquifer of untreated canal water whose composition considered similar to that of storm water runoff, was tested aiming at elimination of flood waters especially in low lying areas of the city of Bangkok. The injection zone originally contained native saline groundwater. Prior to the injection, pumping tests were conducted to determine the aquifer characteristics. Injection test were then operated by free flow or gravity feed and by pumping under pressure. Water levels in the observation wells nearby showed an abrupt response to the injection. Injection of water through wells generally results in partial clogging which causes a reduction of injection rate. One test indicated that after four days of continuous injection at the rate of 200 m³/h, the injection rate was reduced by 12 percent due to partial clogging of the well. Redevelopment of the well by pumping was conducted after each injection test to eliminate well clogging.

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