Wodoprzepuszczalność glin aluwialnych z uprzywilejowanymi drogami przepływu
Abstract
HYDRAULIC CONDUCTIVITY OF ALLUVIAL CLAY CONTAINING PREFERENTIAL PATHS OF GROUND WATER FLOW
Summary
Alluvial clays containing macro-pores were found in the surface part of deposit at Chmielnik valley (Polish Flysh Carpathians), where biological wastewater treatment plant was localized. In order to determine the hydraulic conductivity (k) of clay deposit in vicinity of the plant, the comprehensive field and laboratory tests were made. Besides the conventional test methods, special "in situ" model tests were performed. It was discovered that the hydraulic conductivity values measured with using the convectional methods (k = 1x10-9÷6x10-7 m/s) do not represent the actual field values. The ground water moves much faster through the clay layer than predicted with the hydraulic conductivity obtained in the tests. The model "in situ" tests indicated that value of hydraulic conductivity is k = 5x10-5 m/s. Analysis of hydrogeological situation and results of alluvial clay properties assessment permitted to conclude that the clay layer cannot be considered as a sufficient natural sealant for the design wastewater treatment plant.
Summary
Alluvial clays containing macro-pores were found in the surface part of deposit at Chmielnik valley (Polish Flysh Carpathians), where biological wastewater treatment plant was localized. In order to determine the hydraulic conductivity (k) of clay deposit in vicinity of the plant, the comprehensive field and laboratory tests were made. Besides the conventional test methods, special "in situ" model tests were performed. It was discovered that the hydraulic conductivity values measured with using the convectional methods (k = 1x10-9÷6x10-7 m/s) do not represent the actual field values. The ground water moves much faster through the clay layer than predicted with the hydraulic conductivity obtained in the tests. The model "in situ" tests indicated that value of hydraulic conductivity is k = 5x10-5 m/s. Analysis of hydrogeological situation and results of alluvial clay properties assessment permitted to conclude that the clay layer cannot be considered as a sufficient natural sealant for the design wastewater treatment plant.