Evaporation Control

Modular floating covers

evaporation on a water reservoir
hexoshield cover protect reservoir from evaporation and algae

Evaporation Reduction

Clean water is a natural resource becoming increasingly scarce. In open lagoon and reservoir, evaporation is responsible for most of the liquid loss. Understanding evaporation and how to reduce it is important when looking at minimizing liquid loss.

Evaporation is the water vaporization that occurs on the surface of the pond. For water molecules to evaporate, they must be located near the surface, be moving in the proper direction, and have sufficient kinetic energy to overcome liquid-phase intermolecular forces. When a small amount of the molecules meet these criteria, the rate of evaporation is low.

There are 3 main factors that influence the rate of evaporation:

  • Concentration of the substance evaporating in the air: If the air already has a high level of humidity, then water will evaporate more slowly.
  • Flow rate of air: If fresh air is moving over the water all the time, then the humidity in the air is less likely to go up with time, thus encouraging faster evaporation. This is the result of the boundary layer at the evaporation surface decreasing with flow velocity, decreasing the diffusion distance in the stagnant layer.
  • Temperature of the substance: If the water is hotter, then its molecules have a higher average kinetic energy, and evaporation will be faster.

Our modular evaporation covers are a very effective way to reduce factors that promotes evaporation and conserve water. The high coverage of the Hexprotect® cover will minimize the air flow rate at the surface of the water, insulate the water surface from the sun heat, and create a high humidity air layer that will reduce evaporation.

Advantages of installing a floating cover for evaporation reduction

Covering an open water body has many advantages:

  • Reduces evaporation of water by up to 90%
  • Reduces algae growth and therefore filter clogging
  • Reduces concentration of salts in the water
  • Recuces weathering of reservoir liners, increasing the lifetime of the liner

Modular covers advantages versus solid covers

All our covers offer substantial advantage over solid covers:

  • Quick and easy to install
  • High permeability to rainwater
  • UV Resistant
  • Available in large sizes, with no intermediate seams
  • Modular system allows replacement of a section without removing the whole cover
  • Less Expensive than conventional solid covers
  • Each tile is made of long lasting, UV resistant, high quality HDPE
  • Allow movement of equipment through liquid. Unlimited and easy access to the liquid.
  • Virtually maintenance free
  • Cannot tear like conventional solid cover
  • Aeration can be installed underneath
  • Reduce chemical consumption.
  • Unaffected by rain water
  • Self supporting, no poles or pillars in the reservoir
  • No vegetation growth on top.
  • 10 Year warranty
  • Life expectancy of 25 years
  • Adjust to the variation of the liquid level by spreading & stacking
  • Naturally Self arrange and interlock on the liquid surface
Products Comparison Armor Ball® Armor Ball® Aqua Hexprotect® Hexprotect® Aqua HEXPROTECT MAX R RHOMBO 66 RHOMBO 169
Surface coverage (up to) 91% 91% 99% 99% 99% 99% 99%
Insulation (R factor) ++ + ++ + +++++ +++ ++++
Heating cost reduction (up to) 75% 75% 85% 85% 85% 85% 85%
Evaporation Reduction ++++ ++++ ++ ++++ ++++ +++++ +++++
Wind Resistant + ++++ ++ +++++ ++ +++++ +++++
Buoyancy (per sq.ft)
Odor Control greencheck greencheck greencheck greencheck greencheck greencheck greencheck
Chemical Evaporation Reduction greencheck greencheck greencheck greencheck greencheck greencheck greencheck
Algae Reduction greencheck greencheck greencheck greencheck greencheck greencheck greencheck
Bird Deterrent greencheck greencheck greencheck greencheck greencheck greencheck greencheck
Snow & Ice Resistant greencheck greencheck greencheck greencheck greencheck greencheck greencheck
Quick Install greencheck greencheck greencheck greencheck greencheck greencheck greencheck
Maintenance Free greencheck greencheck greencheck greencheck greencheck greencheck greencheck
Life Expectancy 25+ Years 25+ Years 25+ Years 25+ Years 25+ Years 25+ Years 25+ Years
Cost Estimate greencheck greencheck greencheck greencheck greencheck greencheck greencheck

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