Geomembrane is typically used in road construction, as well as for floating cover system in reservoir to prevent loss of fluid due to evaporation. It also prevents reservoir contamination from airborne particulates as well as bird droppings, dead animals, pollen, etc. Floating covers block off sunlight preventing algae bloom. They also reduce the production of trialomethane (THM) type compounds such as chloroform from forming- these result from a combination of organic substances with chlorine due to reductions in chlorine demand. Most floating cover systems introduced in about 1970s has proven to have a service life of almost 30 years. The advancements in design and materials produce floating covers to offer the low cost quality solution of choice where water quality standards require potable water reservoirs be covered. The applications of floating covers include: • Anaerobic digestion for waste water system • Potable water reservoir cover for drinking water • Covers with enzymes to capture methane gas & produce green energy • Covers to prevent evaporation loss in agriculture • Covers to control odour Floating covers are a very economical method of protecting precious water. The cost can be 20% of the cost for other cover options. Floating covers must be designed to rise and fall with varying reservoir water levels and have drainage systems for the removal of storm water. There are essentially two types of water-tight floating cover systems commonly specified for drinking water storage applications: the weight tensioned defined sump style (Burke® style) and the mechanically tensioned (REVOC® style). Weight tensioned defined sump covers use a combination of floats and weights to affect tension and surface geometry. The geometry is controlled in such a manner that strategically located drainage channels or sumps are formed for the collection of storm water. Storm water is conducted through the sump channels to either gravity drains or sump pumps for removal. Mechanically tensioned type systems use spring or weight loaded cable tension to achieve definition and stability in the cover. A REVOC® style floating cover system consists of tension producing elements attached to the cover’s interior at specific intervals all around the reservoir’s perimeter. The mechanically tensioned portion of the cover is thus held into place and becomes a defined plate that is protected from wind uplift and drifting. The outer cover perimeter is relaxed and forms a sump where storm water can be diverted off of the cover through a drainage system. The cover geomembrane material makes direct contact on top of the water without additional floats for buoyancy. The REVOC® cover system requires less maintenance and lower cover membrane replacement costs and is generally considered a superior system in cold weather applications. Floating cover systems produced from polyester fabric reinforced with Hypalon® or polypropylene offer the best performance. United States National Sanitation Foundation Standard No. 61 (NSF-61) has approved them for contact with drinking water. They are generally produced in thicknesses ranging from of .91 mm to 1.14 mm. At this thickness floating cover withstand the effects of weathering for 20-30 years. With advancements in design and materials, floating covers offer the low cost quality solution of choice where water quality standards require potable water reservoirs be covered. Floating cover applications range from anaerobic digestion covers for wastewater systems, to potable water reservoir covers for municipal drinking water applications. In farming applications they have been successfully used with enzymes to capture methane gas that is used to fuel electricity producing generators that can satisfy 150% of a typical swine farm's electrical power requirements. This alternative generates renewable "green energy" from an otherwise polluting system that provides zero return on investment. (C. W. Neal Corporation)