Check article and photos at Pilotonline.com:
When the project is complete in January 2017, sensors that monitor water height along the ditch will signal the gates to move up or down, a process that typically takes 10 to 15 minutes, according to Mike Mundy, water resource program manager for the city. Though the gates are primarily for protection from tidal water, they will also be monitored to prevent heavy rainfall from causing flooding when they’re closed.

Graphic Credit: Virginian-Pilot