CFB Drainage & Irrigation Systems Flashcards

What type of irrigation head is most commonly used on natural grass athletic fields for its uniform coverage pattern?

Answer: Pop-up rotary heads

Pop-up rotary heads are preferred for athletic fields because they provide uniform coverage over large areas while remaining flush with the surface when not in use.

Which backflow prevention device is typically required by US plumbing codes for athletic field irrigation systems connected to a potable water supply?

Answer: Pressure vacuum breaker (PVB)

A pressure vacuum breaker (PVB) is commonly required by US codes to prevent contaminated irrigation water from flowing back into potable water supplies.

What does 'ET-based' irrigation scheduling mean in the context of athletic field management?

Answer: Applying water to replace the amount lost through evapotranspiration

ET-based scheduling replaces only the water lost through evapotranspiration, matching irrigation input to actual plant water use for efficiency.

In a catch-can test for an athletic field irrigation system, what is the acceptable coefficient of uniformity (CU) for a well-designed system?

Answer: Above 85%

A coefficient of uniformity above 85% is considered acceptable for a well-designed and functioning athletic field irrigation system.

What is the primary purpose of check valves installed within pop-up irrigation heads on sloped athletic fields?

Answer: To prevent low-head drainage after irrigation cycles

Check valves in irrigation heads on sloped fields prevent water from draining out of lower-elevation heads after the system shuts off, avoiding puddling and wasted water.

Which soil amendment is most commonly added to improve drainage in a native-soil athletic field construction project?

Answer: Coarse sand

Coarse sand is most commonly incorporated into native soil profiles to increase porosity and improve drainage on athletic fields.