Landscape Design Hardscape Design and Construction

Question 1

What is the standard recommended slope for a patio or walkway to ensure proper drainage away from a structure?

Accepted Answer

1 to 2 percent (1/8 to 1/4 inch per foot)

Answer

A 1 to 2 percent slope directs water away from buildings while remaining comfortable and safe for foot traffic.

Question 2

Which base material is most commonly used beneath interlocking concrete pavers to provide stability?

Accepted Answer

Compacted crushed stone

Answer

Compacted crushed stone aggregate base provides a stable, well-draining foundation that prevents paver settling and shifting.

Question 3

What is a 'setback' in the context of US hardscape design?

Accepted Answer

Required distance from a structure to the property line

Answer

A setback is the minimum distance a structure or paved surface must be located from property lines, as required by local zoning ordinances.

Question 4

What type of retaining wall requires geogrid reinforcement for walls exceeding a certain height?

Accepted Answer

Segmental retaining wall (SRW)

Answer

Segmental retaining walls over 4 feet tall typically require geogrid reinforcement extending back into the retained soil for structural stability.

Question 5

What is the purpose of a French drain in a landscape?

Accepted Answer

Redirect subsurface water away from an area

Answer

A French drain is a trench filled with gravel and a perforated pipe that collects and redirects subsurface water to a discharge point.

Landscape Design Practice Test