C27 License - C-27 Landscaping Contractor License Drainage and Lighting Systems Questions and Answers

Question 1

When installing a French drain system to manage subsurface water, what is the generally accepted minimum slope or grade required for the pipe to ensure proper water flow by gravity?

Accepted Answer

1% (1 inch drop per 8-10 feet)

Answer

0.5% (1/16 inch drop per 10 feet)

Answer

3% (3.5 inch drop per 10 feet)

Answer

5% (6 inch drop per 10 feet)

Question 2

A client wants to install low-voltage landscape lighting around their new patio. According to the National Electrical Code (NEC), what is the maximum voltage allowed for these types of lighting systems?

Accepted Answer

30 volts

Answer

12 volts

Answer

24 volts

Answer

120 volts

Question 3

Which of the following drainage solutions is specifically designed to intercept and remove surface water from hardscapes like driveways, patios, and pool decks?

Accepted Answer

Channel Drain (Trench Drain)

Answer

French Drain

Answer

Dry Well

Answer

Swale

Question 4

In a low-voltage landscape lighting installation, what is the primary purpose of using a multi-tap transformer?

Accepted Answer

To compensate for voltage drop over long wire runs

Answer

To power different types of bulbs (LED and halogen) simultaneously

Answer

To allow for the connection of more than 25 fixtures to a single unit

Answer

To meet Title 24 energy efficiency requirements

Question 5

A landscaping project requires grading the soil adjacent to a new home's foundation to ensure proper surface drainage. According to the California Residential Code (CRC), what is the minimum required fall away from the foundation?

Accepted Answer

6 inches within the first 10 feet

Answer

2 inches within the first 5 feet

Answer

4 inches within the first 10 feet

Answer

1 foot within the first 20 feet

Question 6

When installing a perforated pipe for a French drain, what is the correct orientation for the drainage holes?

Accepted Answer

Facing downward, to allow collected water to exit and be carried away.

Answer

Facing upward, to allow water to enter from the top.

Answer

Alternating up and down, to catch water from all angles.

Answer

To the side, to prevent clogging from surface debris.