Question

Which of the following is true ? a. A stable historic channel can sometimes be used as a reference reach to obtain estimates for the dependent design variables of channel width and planform. b. An existing pristine or pre-settlement reach may also be used as an analog or reference reach. c. In practice, several references reaches with relatively similar channel-forming discharges may be used to develop a range of solutions using regression equations d. Only a and c is true e. All of the above f. None of the above

Answer 1

Option e i.e. all of a, b and c are correct. These are the basic design concept used for alluvial channel design.

1. A stable historic channel can sometimes be used as a reference reach to obtain estimates for the dependent design variables of channel width and planform.

2. An existing pristine or pre-settlement reach may also be used as an analog or reference reach.

3. In practice, several references reaches with relatively similar channel-forming discharges may be used to develop a range of solutions using regression equations.

All of above are true.