Q1: The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is

ANS:D - 216 cu m

Given:

• Length of the tank = 24 m
• Width of the tank = 6 m
• Depth of the tank = 3 m
• Detention period = 2 hours

The volume of the tank can be calculated as follows: Volume = Length × Width × Depth Volume = 24 m × 6 m × 3 m Volume = 432 cubic meters Now, with a detention period of 2 hours, the total volume of sewage that can be handled by the tank is: Total Volume = Volume of Tank × Detention Period Total Volume = 432 cubic meters × 2 hours Total Volume = 864 cubic meters To find the rate of flow of sewage per hour, we divide the total volume by the detention period: Rate of Flow = Total Volume / Detention Period Rate of Flow = 864 cubic meters / 2 hours Rate of Flow = 432 cubic meters per hour Therefore, the correct rate of flow of sewage per hour should be 432 cubic meters, not 216 cubic meters. It seems there might have been a mistake in the options provided or the calculation method.