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Vegetated Waterways in Land and Water Conservation Engineering

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Vegetated Waterways in Land and Water Conservation Engineering

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Questions and Answers

What is the minimum recommended width for a waterway channel bottom?

3m (correct)

What type of grasses are not suitable for waterways?

Tall grasses (correct)

Dense, tough, and long-lived grasses

Shrubs

Perennial grasses

What determines the permissible velocity of a waterway?

Slope of the waterway

Density of vegetation (correct)

Channel roughness

Size of the waterway

What is the minimum recommended depth for a waterway?

0.3m (B) Signup and view all the answers

What is the design velocity?

The speed limit determined by vegetation density (B) Signup and view all the answers

What factor does NOT affect the volume of runoff?

Shape of the waterway (C) Signup and view all the answers

What is an advantage of vegetated waterways in terms of maintenance?

Decreased maintenance costs associated with erosion (D) Signup and view all the answers

What is the basis for vegetated waterway design, except in flood spillways for dams?

A 10-year return period storm (D) Signup and view all the answers

What is a potential benefit of vegetated waterways for wildlife?

Enhancement of wildlife habitat (A) Signup and view all the answers

What is a function of vegetated waterways in terms of soil erosion?

Reduce soil erosion from non-crop areas (D) Signup and view all the answers

How do vegetated waterways improve water quality?

By filtering pollutants (B) Signup and view all the answers

What is a disadvantage of vegetated waterways in terms of land use?

Acreage is taken out of production (C) Signup and view all the answers

What is the primary factor that determines the roughness of a channel?

The height of the vegetation (A) Signup and view all the answers

What is the permissible velocity for a channel lined with very dense vegetation on a slope of 0-5%?

6 ft/s (1.83 m/s) (A) Signup and view all the answers

What is the main purpose of using vegetation in channel design?

To prevent soil erosion (D) Signup and view all the answers

How does the depth of flow affect the roughness coefficient?

It increases the roughness coefficient (B) Signup and view all the answers

What is the average length of very tall vegetation?

Greater than 760 mm (30 in.) (C) Signup and view all the answers

What is the primary factor that influences the resistance of flow in a channel?

The type and condition of vegetation (B) Signup and view all the answers