1. A pumping well is to be constructed in an area where the water table is at a depth of 2.1 m from the ground surface of a pervious stratum. Total depth of soil drilling (extraction) for the well from the ground surface is 12.5 m and at this depth, an impervious layer was encountered. Diameter of the pumping well is 580 mm. At a constant rate of pumping the water from the well, the maximum drawdown was 6.8 m. Yield from the well is 215 m³/day and hydraulic conductivity of the pervious stratum is 5.112 m/day. The total extracted soil from the well construction was examined for soil property determination. Total weight of the extracted soil was 64.1 kN. Assume that this soil is 100% saturated and its specific gravity of soil solids is 2.50. If the well will be closed after its life span, it will be backfilled with soil coming from the borrow pit area and to be compacted to attain the same unit weight just like the natural state of the soil stratum. In the borrow pit area, natural unit weight of soil is 16.2 kN/m³. Moisture content and specific gravity of soil solids for the soil are 14.2 % and 2.20, respectively. Draw and label the aquifer and determine the following requirements: a. Radius of influence for the well. b.Natural unit weight of the pervious stratum. c. Void ratio of the pervious stratum

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Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.