Agricultural/Bioengineering Soil and Water Conservation Engineering 2

Question 1

Which dimensionless number is used to predict whether channel flow is laminar or turbulent?

Accepted Answer

Reynolds number

Answer

The Reynolds number compares inertial forces to viscous forces and determines the flow regime.

Question 2

In terracing, the term 'terrace interval' refers to:

Accepted Answer

Vertical or horizontal distance between consecutive terraces

Answer

Terrace interval is the vertical or horizontal spacing between adjacent terraces on a slope.

Question 3

The SCS curve number method is used to estimate:

Accepted Answer

Direct runoff from rainfall

Answer

The SCS (now NRCS) curve number method relates rainfall to direct runoff based on land use and soil type.

Question 4

Which soil texture has the greatest water-holding capacity?

Accepted Answer

Clay soil

Answer

Clay soils have fine particles with large total surface area and small pore spaces, enabling high water retention.

Question 5

Check dams are installed in gullies primarily to:

Accepted Answer

Trap sediment and reduce gully head advance

Answer

Check dams reduce flow energy, trap sediment, and slow the upstream advance of gully erosion.

Agricultural/Bioengineering Practice Test