BLArch Bachelor of Landscape Architecture Grading and Drainage 2

Question 1

What is the primary purpose of a 'detention basin' in stormwater management?

Accepted Answer

Temporarily hold stormwater and release it slowly to reduce peak flow

Answer

A detention basin temporarily stores stormwater during a rain event and releases it slowly, reducing downstream peak flow rates.

Question 2

In grading plans, contour lines that are closer together indicate:

Accepted Answer

Steeper slopes

Answer

Closely spaced contour lines represent steeper slopes because the same elevation change occurs over a shorter horizontal distance.

Question 3

What is the ADA-required maximum cross slope for accessible pedestrian paths?

Accepted Answer

2%

Answer

ADA standards require that accessible paths have a maximum cross slope of 2% (1:50) to prevent wheelchair instability.

Question 4

Which of the following stormwater management strategies reduces impervious surface area?

Accepted Answer

Pervious pavement

Answer

Pervious pavement allows water to infiltrate through the surface, reducing runoff volume and mimicking natural hydrology.

Question 5

What is the term for the low point in a grading plan where water collects and must be drained?

Accepted Answer

Sump or low point

Answer

A sump or low point is the lowest elevation on a graded surface; it must have a drain or outlet to prevent ponding.

BLArch Bachelor of Landscape Architecture Practice Test