During the zone-by-zone flushing, how should you proceed with risers?

• A. Remove all caps at once and flush all risers
• B. Remove one riser cap at a time and flush each zone
• C. Do not remove caps
• D. Remove caps in random order

Answer: (B)

Zone-by-zone flushing works by isolating each section of the irrigation line and flushing it one at a time. Removing one riser cap at a time and flushing that zone lets you observe the specific flow from that zone, check for debris, and confirm the line is clear before moving to the next area. This targeted approach prevents debris from being carried between zones and gives you direct control over pressure and flow for each section.

Flushing all caps at once would mix flows from multiple zones and make it hard to identify where debris is coming from or whether a particular zone is clean. Not flushing at all doesn’t remove debris, and removing caps in a random order loses the needed isolation and control, which can lead to incomplete flushing and confusion about which zones are clear.