ANS:B - 1 in 10

I apologize for the confusion. Let me correct the explanation. The bottom of the sewage inlet chamber of septic tanks is typically provided with an outward slope to facilitate the flow of sewage into the tank. This slope helps to direct the sewage towards the tank and prevent it from stagnating or pooling in the inlet chamber. Among the options provided, the most common outward slope for the bottom of the sewage inlet chamber is:

• 1 in 10

This means that for every 10 units of horizontal distance, the bottom of the inlet chamber slopes downward by 1 unit. Explanation for 1 in 10 slope:

• The slope of 1 in 10 is relatively steep compared to other options. It allows for efficient drainage of sewage from the inlet chamber into the septic tank.
• The relatively steep slope helps to prevent the accumulation of solids and sediment in the inlet chamber, reducing the likelihood of clogging or blockages.
• A 1 in 10 slope provides a good balance between efficient flow and space constraints, allowing for effective sewage transfer while minimizing the overall depth of the inlet chamber.
• This slope is commonly used in septic tank designs to ensure that sewage flows smoothly into the tank without causing backups or hydraulic issues.

Therefore, the bottom of the sewage inlet chamber of septic tanks is often provided with an outward slope of 1 in 10 for efficient drainage and prevention of blockages.