Which of the following statements are correct with respect to estimation of water tanks?

A: Water proofing compounds are added in plaster of water tank walls.

B: Item particulars in estimate of water tanks, does not include estimate of ladder to be built around it.

C: When the vertical and horizontal walls of tanks meet, a sloping structure is built at their intersection, this is called haunching.

D: When the vertical and horizontal walls of tanks meet, a sloping structure is built at their intersection, this is called soling. 

Explanation:

• Waterproofing is essential for ensuring the longevity and functionality of water tanks, especially when they are used for storing drinking water.
• Waterproofing compounds are added to the plaster applied on the walls of the tank to prevent water from leaking through the structure.
• This practice is particularly important in tanks where water retention is crucial, and it helps avoid seepage which could compromise the strength and quality of the surrounding soil or other structures.
• Haunching refers to the sloped or beveled area at the intersection of the vertical and horizontal walls of a tank. This structure is provided to strengthen the joint and reduce stress concentration.
• Without haunching, the junction could become a weak point, especially under the load of water or during changes in temperature and pressure.
• Haunching ensures a more durable and stable connection between the walls, improving the overall strength and stability of the tank.

Additional Information

• In the estimation process for a water tank, it's common practice to include all the components necessary for construction, including the provision of access such as ladders.
• Ladders are crucial for maintenance and cleaning the tank, especially in large water tanks. They provide safe access for workers to enter and work inside the tank.
• Therefore, estimates should indeed include the cost of constructing ladders or steps, along with other elements like the walls, foundation, and waterproofing. 
• Soling is a term used in construction to refer to a layer of coarse material, typically used as a foundation or base material for the lower parts of structures.
• It helps in load distribution and stability. However, soling is not used to describe the sloping structure at the junction of the vertical and horizontal walls of a water tank.
• The term for that is haunching. Soling is used beneath the tank's base to provide support, but it is not relevant for the sloping intersection of walls.