BLArch Bachelor of Landscape Architecture Grading and Drainage

Question 1

What is the minimum recommended slope away from a building foundation to ensure positive drainage?

Accepted Answer

2% for 10 feet

Answer

0.5% for 5 feet

Answer

1% for 10 feet

Answer

5% for 20 feet

Question 2

In landscape grading, what does the term 'spot elevation' refer to?

Accepted Answer

A specific elevation noted at a precise point on a plan

Answer

The highest point on a grading plan

Answer

The average elevation of a graded area

Answer

The elevation of a drainage inlet

Question 3

What is the formula for calculating percent slope?

Accepted Answer

Rise ÷ Run × 100

Answer

Run ÷ Rise × 100

Answer

Rise × Run × 100

Answer

(Rise + Run) ÷ 100

Question 4

Which type of drainage system collects surface runoff through underground perforated pipes?

Accepted Answer

French drain

Answer

Swale

Answer

Catch basin

Answer

Bio-retention cell

Question 5

A 'swale' in site drainage is best described as:

Accepted Answer

A shallow, vegetated channel that conveys stormwater

Answer

A vertical retaining structure

Answer

An underground cistern for water storage

Answer

A permeable paving system

Question 6

What does the term 'cut and fill' mean in site grading?

Accepted Answer

Balancing excavated material (cut) with areas that need fill to minimize hauling

Answer

Removing topsoil and replacing subsoil

Answer

Cutting tree roots and filling with concrete

Answer

Creating level terraces using retaining walls