Finish the sentences.

1) A buttress dam consists of …

2) There are several types of buttress dams, the most important ones …

3) Flat-slab buttress dams may be constructed in locations where …

4) In cross-section buttress dams resemble …, but …

5) In a buttress dam a slab of reinforced concrete rests on …

6) Closely spaced buttresses can be … and the slabs can be …

7) Concrete beams of diaphragms may be utilized to resist …

8) Hollow buttresses are used to increase …

9) One of the most interesting features of the flat-slab dam is its …

10) The joint between the slab and buttress is filled with …

11) Flat-slab and buttress dams are adapted to …

12) Placing the buttresses on spread footings one can reduce …

13) Flat-slab dams may be built on materials ranging from … to …

14) In the multiple-arch dams the cantilever action is commonly not taken …

15) The design of a multiple-arch dam is more economical …

16) Buttress dams are subjected the following forces …

17) A buttress dam may be used on foundations which are …

18) The height of a buttress dam can be increased by …

19) Powerhouses and water-treatment plants are usually placed between …

20) The first steps in the construction of buttress dams are …

21) Great care must be taken in …

22) Keyways are required in all …

23) The time for construction of buttress dam is …