$204$

CHAPTER $9$

Dewatering

PROBLEMS

Figure $9\mathrm{.}21$ is representative of soil conditions at a construction site. If you are the contractor, select a dewatering method you would consider appropriate for each of the projects described below. Consider the information given in this chapter, earlier chapters and any other information that may be appropriate. Describe in detail how your system would be built and operated. Justify clearly any assumptions you make. Discuss what difficulties you may encounter and how you should plan for them.

a$.$ A circular reservoir $100ft$ in diameter is to be built with a bottom slab $25ft$ below present ground surface. The groundwater level must be held at least $2ft$ below the slab until the reservoir is filled.

b$.$ A bridge pier with a driven pile foundation is to be built with the bottom of the pile cap $40ft$ below present grade. The cap is $20ft$ by $30ft$ in plan view.

FiguRE $9\mathrm{.}21$ Soil Profile for Problem $1.$

Soil description