Patent ID: 6357964
Filing Date: 2002-03-19
Classification: B09B,E04H,Y02W

Abstract:
In combination, a wastewater reservoir and a membrane cover mounted over said wastewater reservoir; said wastewater reservoir having a wastewater level and perimeter walls, and said membrane cover comprising:a flexible buoyant impermeable membrane affixed to said perimeter walls and loosely laid over said wastewater level; an array of weight lines anchored to said perimeter walls and loosely laid over said impermeable membrane, said weight lines defining a rectangular herringbone pattern comprising a longitudinal weight line and a plurality of spaced-apart lateral weight lines extending perpendicularly from said longitudinal weight line on both sides of said longitudinal weight line; an array of drains each of which being disposed along at least one of said lateral weight lines and extending into the wastewater through said impermeable membrane; an array of troughs formed therein under said array of weight lines; said troughs being connected to each other; and a water ballast contained in said troughs; such that said membrane cover is kept taut and stable during a rainstorm, and a surface thereof exposed to uplifting wind forces is minimized.