A membrane cover is mounted at the surface of a wastewater reservoir. The membrane cover has a flexible buoyant impermeable membrane affixed to the perimeter walls of the reservoir and loosely laid over the wastewater level inside the reservoir. An array of weight lines is anchored to the perimeter walls and is loosely laid over the impermeable membrane. The array of weight lines defines a rectangular herringbone pattern. An array of drains is also provided. Each drain is disposed along one of the lateral weight lines. The membrane cover also comprises an array of troughs formed therein under the array of weight lines. A water ballast having the continuous herringbone pattern is contained within the troughs. Because of this water ballast, the membrane cover is kept taut and stable during a rainstorm and a surface thereof exposed to uplifting wind forces is minimized.

A pool cover drain substantially completely drains collected rainwater without use of pumps or electrical hookups. The pool cover drain is non-centrally located in a pool cover. It is attached to a flexible hose that directs the water to a swimming pool sidewall drain outlet. A sealed weighted tubular element creates a conical depression in said swimming pool cover. The sealed weighted tubular element is placed atop the pool cover in close proximity to said pool cover drain. Collected rainwater is directed along the outside walls of the weighted tubular element, and into the pool cover drain. Sand weights on an end of the sealed weighted tubular element proximate the pool cover drain facility a gravity feed of collected rainwater into the pool cover drain. The sealed weighted tubular element is optionally provided with right-angled projections to prevent rolling and displacement thereof during high velocity wind gusts. A filter in the pool cover drain prevents clogging by debris and the like.

The present invention generally relates to an assembly and related methods for draining water from atop a pool cover. The invention may be said to include a pool cover that has an aperture defined therein and a drain assembly attached to the pool cover and associated with the aperture of the pool cover. The drain assembly of the invention generally includes a debris filter and/or appropriate drain cover to enable water from atop the pool cover to enter the drain assembly and be transported at least generally away from the pool. In addition, the drain assembly is generally designed/configured to exhibit a weight sufficient to position at least a portion of debris filter/drain cover at or below a water level of the pool with which it is being utilized to further drainage capabilities.

A pool cover drain substantially completely drains collected rainwater without use of pumps or electrical hookups. The pool cover drain is non-centrally located in a pool cover. It is attached to a flexible hose that directs the water to a swimming pool sidewall drain outlet. A weighted tubular element creates a conical depression in said swimming pool cover. The weighted tubular element is placed atop the pool cover in close proximity to said pool cover drain. Collected rainwater is directed along the outside and, optionally, the inside walls of the weighted tubular element, and into the pool cover drain. Angled weighted projections are located on an end of the weighted tubular element proximate the pool cover drain to facilitate gravity feed of collected rainwater into the pool cover drain. These angled weighted projections are weighted by filling the projection tube with sand, or optionally without sand by slotting the projection tube and allowing rainwater to collect therein and act as a weight. The weighted tubular element is provided with T type projections opposite to the angled weighted projections to prevent rolling and displacement of the weighted tubular element during high velocity wind gusts. A filter in the pool cover drain prevents clogging by debris and the like.

A membrane cover is mounted at the surface of a wastewater reservoir. The membrane cover has a flexible buoyant impermeable membrane affixed to the perimeter walls of the reservoir and loosely laid over the wastewater level inside the reservoir. An array of weight lines is anchored to the perimeter walls and is loosely laid over the impermeable membrane. The array of weight lines defines a rectangular herringbone pattern. An array of drains is also provided. Each drain is disposed along one of the lateral weight lines. The membrane cover also comprises an array of troughs formed therein under the array of weight lines. A water ballast having the continuous herringbone pattern is contained within the troughs. Because of this water ballast, the membrane cover is kept taut and stable during a rainstorm and a surface thereof exposed to uplifting wind forces is minimized.