Earth-whose in situ weight is 112 lb/ef, whose loose weight is 95 lb/cf, and whose compacted weight is 120 lb/cf-is placed in a fill at the rate of 250 cy/hr, measured as compacted earth. The thickness of the compacted layers is 6 in. A compactor with a roller drum width of 84 in. is used to compact the material at a speed of 2.5 mph. Assume a 55-min hour operating efficiency. Determine the number of rollers required to provide the necessary compaction rate if eight drum passes are specified for each layer of earth.

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A: Number of blows(N) 6 12 20 28 32 Water Content (%) 52.5 47.1 43.2 38.6 37.0

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Basic Concepts of Water Resource Sustainability

The majority of the earth's surface is composed of water. The water which is available for use by the living beings on earth comes from various water resources. Water resources are the naturally occurring water bodies that are intended to be used by the living beings on earth for drinking and other uses. Water resources provide 3% as freshwater, 97% as saltwater, two-thirds of which are frozen as glaciers and ices. The remaining water which generally doesn't remain frozen are the water resources found underground, precisely known as groundwater. The majority of these water sources act as non-convention sources of power generation, like in hydropower stations.