Design a sedimentation basin for a water treatment plant with the following specifications assuming it is required to supply a city with a population of 50,000 people: ● Rectangular or square basin Depth: 7-18 ft Width: 10-50 ft • Detention time: 4-8 hours • Flow through velocity: <0.55 ft/min Overflow rate: 400-1,100 gal/day-ft² Draw a figure to show calculated dimensions. You may consider to use SI units in calculations. Hint: Overflow rate is Flow/Surface Area; Detention time is Volume of tank/Flow rate; and Depth= Volume/Surface area

7. (Mass balance, A river with 400 mg/L of salts (a conservative substance) and an upstream flow of 25.0 m³/s receives an agricultural discharge of 5.0 m³/s carrying 2,000 mg/L of salts. The salts quickly become uniformly distributed in the river. A municipality just downstream withdraws water and mixes it with enough pure water (no salt) from another source to deliver water having no more than 500 mg/L salts to its customers. What should be the flowrate mixture ratio F of pure water to river water?

Please answer all 1. List the three corrections which should be applied to the hydrometer readings.  2. Why is it important to remove the hydrometer from the measuring cylinder between readings? 3. A hydrometer test has the following results; Gs = 2.70, temperature = 240C, and L = 92 mm at 60 minutes after the start of sedimentation. Calculate the diameter of the smallest-size particles that have settled beyond the zone of measurement at that time (use the table in the lab manual to find, A=0.0128). D(mm) = A sqrt( L(cm) / t(min) )

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