Freeboard. The vertical distance between the design high water mark and the top of a pond (or other structure). Most ponds have one to two feet of freeboard to prevent them from overflowing. Infiltration – The soaking of water through the soil surface into the ground (percolation is essentially the same thing). Many ponds are designed to infiltrate or retain stormwater, and thus do not have a regularly used discharge pipe. Infiltration Facility (or Structure) – A facility (pond or trench) which retains and percolates stormwater into the ground, having no discharge (to any surface water) under normal operating conditions. Junction – Point where two or more drainage pipes or channels converge (e.g. a manhole). Jurisdiction – Lacey, Olympia, Tumwater, or Thurston County (as applicable). Lined Pond or Conveyance – A facility, the bottom and sides of which have been made impervious (using, for example, a plastic liner or clay/silt soil layer) to the transmission of liquids.
Freeboard. “D” SYSTEM – FULL SANDBLAST AND RECOAT
Freeboard. 14. The licensee shall maintain a minimum top of embankment freeboard of 300mm within all storage facilities containing saline, alkaline or cyanide constituents to accommodate extreme rainfall events and prevent overtopping. This condition includes, but is not limited to tailings dams, return water dams, process water dams and raw water dams. PIPELINE BUNDING
Freeboard. The design top elevation within a pond shall be two feet above any calculated 100- year floodplain elevation or one foot above the adjacent emergency overflow.
Freeboard. Flotation shall be adequate to support the top of the decking no less than 12" and no more than 20" above the water level under dead load conditions (the entire weight of the floating units and all permanently mounted equipment), and no less than 8" above the water level under minimum live load conditions. Flotation shall be designed for a minimum dead load of 19 lbs. per square foot (p.s.f.), and a minimum live load of 30 lbs. p.s.f.
