Question

When the area to be enclosed is large, it becomes essential to provide the _________ construction so as to give stability to the cofferdam.

(a) Single wall cofferdam

(b) Cellular cofferdam

(c) Double wall cofferdam

(d) Suspended cofferdam

Answer 1

Right answer is (c) Double wall cofferdam

To explain I would say: Double wall cofferdam was frequently used on the river Ohio in USA and hence, it derives its name as Ohio river type cofferdam. It is cheap and can be built up rapidly l. It is suitable for hard bed where there is no problem of erosion. This type of cofferdam is unsuitable for deep water.