Treated effluent from Wastewater Treatment Plant (WWTP) flows through a cylindrical pipe of diameter (d)-0.6m. This...

 
 
 
 

 

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Treated effluent from Wastewater Treatment Plant (WWTP) flows through a cylindrical pipe of diameter (d)-0.6m. This pipe is slanted at an angle 30° towards the end to allow it to connect to a 2m x 6m closed top rectangular channel. After some distance, the rectangular channel is open to the atmosphere (A2). The rectangular channel discharges water to a 4000 m² storage basin, 5m in depth. Water seeps in through this storage basin to the nearby groundwater table at a rate of 10-5 m/sec to recharge the aquifer. City ABC WWTP A¹ d=0.6m 0-30 A2 2m vide Em deep Recharge basin A = 4000m² h = 5m a. If for outdoor recreational water activities, the city wants to retain at least 80% of the total recharge basin volume, what minimum discharge should the WWTP supply in m³/s to result in 1m/year increase in the groundwater table of area 12000 m². (10 points) b. Draw the velocity profiles at A1 and A2. I (5 points) c. What are the velocities in the cylindrical pipe and rectangular channel? (5 points) d. After designing and successful operation of the plant, how will you confirm the actual velocity in the pipes on field. (5 points) e. Which of the two options would you recommend for designing the walls of the recharge A 30° A B B' basin to allow for maximum resisting moments at A' or B' to resist the hydrostatic force? Neglect the weight of the walls. Quantitatively compare the resisting moments in both cases given the density of water is p. (15 points) f You are floating in a boat with an aluminum anchor to collect water samples from the pond. The anchor has a specific gravity of 3 and a volume of 0.02 m³. You throw the anchor out of the boat into the recharge basin to station yourself. By how much (if any) will the water level in the basin change? (10 points) Treated effluent from Wastewater Treatment Plant (WWTP) flows through a cylindrical pipe of diameter (d)-0.6m. This pipe is slanted at an angle 30° towards the end to allow it to connect to a 2m x 6m closed top rectangular channel. After some distance, the rectangular channel is open to the atmosphere (A2). The rectangular channel discharges water to a 4000 m² storage basin, 5m in depth. Water seeps in through this storage basin to the nearby groundwater table at a rate of 10-5 m/sec to recharge the aquifer. City ABC WWTP A¹ d=0.6m 0-30 A2 2m vide Em deep Recharge basin A = 4000m² h = 5m a. If for outdoor recreational water activities, the city wants to retain at least 80% of the total recharge basin volume, what minimum discharge should the WWTP supply in m³/s to result in 1m/year increase in the groundwater table of area 12000 m². (10 points) b. Draw the velocity profiles at A1 and A2. I (5 points) c. What are the velocities in the cylindrical pipe and rectangular channel? (5 points) d. After designing and successful operation of the plant, how will you confirm the actual velocity in the pipes on field. (5 points) e. Which of the two options would you recommend for designing the walls of the recharge A 30° A B B' basin to allow for maximum resisting moments at A' or B' to resist the hydrostatic force? Neglect the weight of the walls. Quantitatively compare the resisting moments in both cases given the density of water is p. (15 points) f You are floating in a boat with an aluminum anchor to collect water samples from the pond. The anchor has a specific gravity of 3 and a volume of 0.02 m³. You throw the anchor out of the boat into the recharge basin to station yourself. By how much (if any) will the water level in the basin change? (10 points)