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Floating covers are geomembrane systems installed on the surface of ponds, lagoons, digesters, and reservoirs to protect stored water, capture biogas, and control evaporation, odor, and algae. EC Applications fabricates, installs, and maintains floating covers for potable water storage, chemical containment, and biogas collection, delivered as a single design-to-construction-to-maintenance service from offices in California, Texas, and Nevada.
A floating cover isolates the liquid surface from sunlight, air, wildlife, and rainfall, which addresses several problems at once: evaporation loss, algae growth, odor emissions, heat loss, and contamination of stored water. On anaerobic lagoons and digesters, the same membrane becomes a gas collection surface that captures biogas instead of venting it to atmosphere.
For potable water utilities, a cover keeps birds, debris, and airborne contamination out of finished water and blocks the sunlight that drives algae blooms and disinfection byproduct chemistry. For industrial and agricultural operators, covers control odor at the source, retain process heat, and preserve water inventory in evaporation-prone climates. Because a floating membrane rides on the liquid itself, it works at any water level and is typically far less expensive than building a fixed roof over the same footprint.
EC Applications has installed floating covers across this full range of duties: potable water storage, odor control, biogas collection, chemical containment, evaporation control, heat loss prevention, liquid and semi-solid storage, and algae control.
Material selection follows the duty. Potable water covers are built from membranes rated for drinking water contact, most commonly CSPE (Hypalon) and CoverFlex, both proven over decades of reservoir service in direct sunlight. Chemical containment covers use XR Geomembrane, an ethylene interpolymer alloy with high resistance to hydrocarbons and aggressive liquids. Biogas and wastewater covers are typically reinforced polypropylene, HDPE, or reinforced polyethylene, selected for weld quality, gas tightness, and resistance to the sulfur compounds in digester gas.
EC Applications has extensive experience installing CSPE (Hypalon), XR Geomembrane, reinforced and unreinforced polypropylene, CoverFlex, reinforced and unreinforced polyethylene, and HDPE covers. Because large custom panels are fabricated in controlled conditions before crews mobilize, most seaming happens in the shop rather than over open water, which improves seam quality and shortens the field schedule.
A biogas collection cover seals the surface of an anaerobic lagoon or digester so the methane-rich gas produced by digestion collects under the membrane instead of escaping. The cover is anchored at the perimeter, and gas rises to collection points where piping draws it off to a flare, boiler, or gas conditioning system. Float and ballast networks on the cover manage where gas accumulates and keep the membrane geometry stable as gas production and liquid level change.
Pressure dome covers take this further: the membrane is inflated by the gas itself into a dome that provides storage volume and steady delivery pressure to downstream equipment. EC Applications installs both flat gas collection covers and pressure dome covers, including the anchor trenches, gas piping penetrations, and condensate management details that determine whether a biogas cover performs over its service life.
EC Applications provides complete solutions for three principal configurations. Defined sump covers use a network of floats and weights to create engineered channels that direct rainwater to sump pumps, the standard approach for potable water reservoirs where stormwater must be removed from the cover surface. Cable tensioned covers use tensioning cables to hold the membrane in a controlled geometry, suited to ponds with fluctuating levels or irregular shapes. Pressure dome covers are gas-inflated structures used for biogas collection and storage.
Configuration is chosen during design based on what the cover must do: manage rainwater, track a moving liquid level, or store gas. Getting this right up front, along with anchorage details and access provisions for maintenance crews, is most of what separates a cover that lasts decades from one that fails early.
A floating cover needs routine, scheduled attention: inspection of seams, boots, and perimeter anchors, removal of accumulated rainwater and debris, verification that floats and ballast remain positioned, and checks of sump pumps and gas piping. On potable water covers this is not optional, state and government regulations require documented inspection and maintenance of covered reservoirs.
In addition to installing floating covers, EC Applications provides routine maintenance to keep covers in compliance with those regulations. That allows plant staff to focus on operations while the cover is inspected, repaired, and documented by the same professionals who build these systems. With sound design and consistent maintenance, floating covers routinely deliver service lives measured in decades, and when a membrane does reach end of life it can be replaced, often reusing the existing perimeter anchorage.
Installation quality is verified against the project specification using the applicable ASTM and GRI test methods, with documented QA records at handoff.
| Material | Typical duty | Why it is selected |
|---|---|---|
| CSPE (Hypalon) | Potable water storage | Decades of proven UV performance in exposed reservoir service, drinking water contact |
| CoverFlex | Potable water storage | Flexible reinforced membrane suited to defined sump potable covers |
| XR Geomembrane | Chemical containment | Ethylene interpolymer alloy with high chemical and hydrocarbon resistance |
| Reinforced polypropylene | Water, wastewater, prefabricated covers | Scrim reinforcement and large factory-fabricated panels with broad chemical resistance |
| HDPE and reinforced polyethylene | Biogas and wastewater covers | Weldable, gas-tight, and resistant to digester gas constituents |
Define the cover duty (potable, chemical, biogas), select the membrane and configuration, and engineer floats, ballast, sumps, and perimeter anchorage.
Fabricate large custom panels under controlled shop conditions so the majority of seams are factory welds rather than field welds over water.
Deploy panels across the pond or reservoir, complete field seams, and install float and ballast networks, boots, and penetrations.
Secure the perimeter anchorage, install sump and gas collection hardware, and test seams and penetrations before the cover goes into service.
Provide routine inspection, rainwater and debris management, and documented repairs to keep the cover compliant with state and government regulations.
Our crews handle engineering, fabrication, field installation, and maintenance. Tell us about your site and we will scope it with you.