Determine the dimensions of a rapid-mixing basin to process 12,000 m³/d of water. The basin will be square and the depth is assumed to be 1.5 times the width. Use a detention time of 30 s and velocity gradient of 700 s¹. The average minimum sustained temperature is 15°C and the absolute viscosity is 1.139 × 10-³ kg/(m.s). Two rapid-mixing basins will be constructed with each having the capacity to process the entire flow. Determine the following: a. Dimensions of L, W, and D (m). b. Power input (W).

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Groundwater Flow

The term groundwater refers to the water which is found beneath the earth's surface. Pores present in the soil and rocks with fractures make a passage for rainwater to enter the earth's surface and deposit as groundwater. The flow nature and direction of groundwater under the earth's surface directly impacts the strength and compressibility of the soil, which reflects its ability to support structural loads.