18 Questions
What is the minimum recommended width for a waterway channel bottom?
3m
What type of grasses are not suitable for waterways?
Tall grasses
What determines the permissible velocity of a waterway?
Density of vegetation
What is the minimum recommended depth for a waterway?
0.3m
What is the design velocity?
The speed limit determined by vegetation density
What factor does NOT affect the volume of runoff?
Shape of the waterway
What is an advantage of vegetated waterways in terms of maintenance?
Decreased maintenance costs associated with erosion
What is the basis for vegetated waterway design, except in flood spillways for dams?
A 10-year return period storm
What is a potential benefit of vegetated waterways for wildlife?
Enhancement of wildlife habitat
What is a function of vegetated waterways in terms of soil erosion?
Reduce soil erosion from non-crop areas
How do vegetated waterways improve water quality?
By filtering pollutants
What is a disadvantage of vegetated waterways in terms of land use?
Acreage is taken out of production
What is the primary factor that determines the roughness of a channel?
The height of the vegetation
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)
What is the main purpose of using vegetation in channel design?
To prevent soil erosion
How does the depth of flow affect the roughness coefficient?
It increases the roughness coefficient
What is the average length of very tall vegetation?
Greater than 760 mm (30 in.)
What is the primary factor that influences the resistance of flow in a channel?
The type and condition of vegetation
Learn about vegetated waterways, a natural or constructed channel established in suitable vegetation for safe water disposal, conveying runoff from terraces, diversions, or other water concentrations without causing erosion or flooding. Understand the importance of vegetated waterways in land and water conservation engineering. Study and test your knowledge on this topic!
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