A CASE STUDY OF MONITORING OF SEEPAGE FLOW BEHAVIOR IN THE RIVER LEVEE DURING FLOOD

Abstract

 It is important to measure the seepage flow behavior in the river levee caused by heavy rainfall and flood for estimating the safety factor of the river levee related to seepage. In this paper, the long term continuous field observations of seepage flow occurred in the leaking river levee during flood were carried out. Changes in pore water pressure at the local scale in the river levee and the permeable base layer were measured by using several driven piezometers to confirm the existence of seepage flow line or water level caused by a fluctuation of the water level in the river. Soil water contents at the different depths were measured by using several intrusive soil moisture probes. Observed soil water contents with time were used to estimate the movement of soil water storage of the back slope of the river levee. Through the observed variations in pore water pressure and soil water contents, the specific features of the seepage behavior in the leaking river levee are investigated.