A 3.2 m thick sand stratum intersects one side of a reservoir as shown in Figure 1. This stratum has a hydraulic conductivity of 4 x 10+ m/s and extends along the entire 1000 m length of the reservoir. An observation well has been installed in this stratum as shown. Assume a constant reservoir level. a) b) c) Calculate the seepage loss (.e. rate of flow) from the reservoir through this stratum: Calculate the pore water pressure at point A; and The sand stratum is clogged and its hydraulic conductivity reduces to 5.7 x 10-4 m/s. Using 23 sentences, discuss the changes, if there are, to the seepage loss and water level in the observation well. Observation well el. 167.3 m Clay y el. 165.0 m 20 m Reservoir 4m Sand A 100 m Clay : 73.2 m 256 m Figure 1 Cross-section through reservoir showing silty sand stratum. This cross-section is oriented parallel to the direction of flow. el. = elevation. =