The selection of the depth of a well is based on which of the following criteria?

A disadvantage in using circular shape of well foundation is _______

The limiting head of water value in pneumatic caisson is ____

Coefficient of horizontal soil reaction m, depends on _____

The working chamber of pneumatic caissons are kept airtight because ____

For loose sand, the value of skin friction is between ____

When a rigid well starts moving parallel, it transforms the soil in to ______

The bottom plug is designed in _____ shape.