CLARB Sustainable Design and Environmental Stewardship 2

Question 1

Which design element is a key component of a constructed wetland used for stormwater treatment?

Accepted Answer

Emergent wetland vegetation planted in a shallow engineered basin to biologically filter pollutants

Answer

Constructed wetlands use emergent macrophytes and microbial communities in the root zone to uptake nutrients, trap sediment, and biologically treat stormwater pollutants.

Question 2

A CLARB exam scenario asks how to minimize light pollution from a new park lighting system. Which approach is most appropriate?

Accepted Answer

Use full-cutoff luminaires aimed downward with motion sensors and warm color temperature LEDs

Answer

Full-cutoff fixtures direct light only downward, eliminating sky glow and glare, while motion sensors reduce unnecessary nighttime illumination and dark-sky LEDs minimize ecological disruption.

Question 3

What is the primary goal of a 'carbon sequestration' planting strategy in landscape architecture?

Accepted Answer

Increasing biomass through vegetation to capture and store atmospheric carbon dioxide long-term

Answer

Carbon sequestration plantings maximize biomass accumulation — particularly through large-canopy trees and healthy soils — to absorb and store atmospheric CO₂ over decades.

Question 4

According to EPA's green infrastructure guidance, what is the primary benefit of street tree trenches or silva cells in urban streetscapes?

Accepted Answer

They provide expanded soil volume for tree root growth while managing stormwater through structural soil cells beneath pavement

Answer

Silva cells and structural soil systems support pavement loads while creating rooting space and stormwater storage beneath paved surfaces, enabling healthy urban trees and reducing runoff.

Question 5

A landscape architect is asked to restore a degraded native prairie. Which site preparation method is ecologically preferred before seeding?

Accepted Answer

Kill existing invasive vegetation through herbicide application or prescribed burn, then scarify soil minimally before seeding native seed mixes

Answer

Controlling existing invasive species and lightly disturbing the soil reduces competition and creates seedbed conditions for native prairie species without over-preparing the site.

CLARB - Council of Landscape Architectural Registration Boards Practice Test

CLARB - Council of Landscape Architectural Registration Boards Practice Test

CLARB Sustainable Design and Environmental Stewardship 2