1. Resting on Ground Water Tank: These tanks are widely used for clear water reservoirs and settling tanks in water treatment plants. They are typically constructed at ground level to store treated water (clear water) after filtration or sedimentation. Resting on ground tanks are easier to access for maintenance and cleaning, which makes them suitable for clear water storage. They provide stability and are cost-effective for larger storage capacities. 

2. Under Ground Water Tank: Although underground tanks are used for certain applications, their use for clear water reservoirs and settling tanks is less common compared to ground-level tanks. Underground tanks are more challenging to maintain and inspect regularly, making them less suitable for treated water storage where regular monitoring is required. 

3. Elevated Water Tank: These are primarily used for water distribution by providing pressure through gravity. They are not typically used for clear water reservoirs or settling tanks. 

4. Circular Water Tank: While circular tanks are a common shape for water tanks due to their efficient pressure distribution, this option does not specifically denote their usage type. Ground-level tanks can be circular in shape but are distinguished by their placement rather than shape