ANS:C - less than the rate of water supply

1. More than the rate of water supply: This scenario would imply that more sewage is being generated than the volume of water supplied to households and businesses. Such a situation could indicate significant non-potable water usage, such as industrial processes or irrigation, which contribute to the overall sewage flow. However, in most urban areas, the rate of sewage flow is closely aligned with the rate of water supply.
2. Equal to the rate of water supply: This assumption suggests that the volume of sewage generated by households and businesses is approximately equal to the volume of water supplied for various purposes. In municipal water and sewage systems, this assumption helps in planning, designing, and managing infrastructure effectively, ensuring that sewage treatment facilities are adequately sized to handle the wastewater generated.
3. Less than the rate of water supply: If the rate of sewage flow is less than the rate of water supply, it could indicate water conservation practices, efficient water usage, or significant non-potable water sources that do not contribute to sewage flow. However, this situation is less common in urban areas where water usage is typically associated with sewage generation.
4. At 150 litres per capita: This option refers to the average water consumption per capita per day, often used as a benchmark for water planning and management. However, it does not specifically address the relationship between the rate of sewage flow and the rate of water supply.