Ocean Caraibes - Coastal & Environmental Consulting, Engineering & Oceanography


Coastal, Environmental & Water Resources Engineers

   Cell:  767.235.5962

Office:  767.448.5960
Skype:  ocean.caraibes

E-Mail: ocean@cwdom.dm 

        or: cljconsultant@gmail.com

    Fresh Water Retention


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Rainwater Harvesting is a very common practice in both tropical and non-tropical locations around the world. 



Fresh Water...our most important
natural resource.  


Whether for drinking, irrigating, gardening, bathing, washing or cleaning,  our need for fresh water in our daily lives is unquenchable. Ocean Caraibes can help you capture and sustain fresh water beyond in a variety of efficient ways.



Collection Methods & Storage



Perhaps the oldest method of harvesting fresh rain water is utilizing the broad, sloped surface of any roof (the collector). When it rains, water falls on the roof, runs down to a gutter channel  placed directly under the bottom edge (eave) of the roof. Subsequently, the water then runs to pipe that carries it to a storage catchment... a barrel, tank, cistern, pond -- anything suitable for retention.


For example, a pitched roof area measuring 40 ft x 48 ft potentially can collect 400 gallons a day during a light rain or 1500 gallons in a few hours (or less) during moderate rainfalls and much much more during heavy rainfall periods.  A rule of thumb calculation for square footage per amount collected is about 400 gallons of water per 1 inch of rainfall. 


Pervious pavement / porous pavement

Pervious pavement / porous pavement consists of a permeable surface course underlain by a uniformly-graded stone bed. Rainwater drains through the surface, is temporarily held in the empty spaces of the stone bed. It then  drains into the underlying soil mantle or is controlled by strategically placed channels where it drains into a cistern, pond or other suitable storage.


There are three types of permeable pavements:

           1. Plastic pavers - A plastic honeycomb grid in which grass or other
             vegetation can grow

           2. Concrete pavers - Concrete blocks with spaces in between them
             for better drainage


           3. Asphalt/concrete -  Fine particles are left out of it to make it
             more porous.


Catchment Ponds and Reservoirs

Storage Pond - given the availability of basically flat or gentle sloping land...  at a reasonable cost this option merits consideration. Simple in design, a pond, created by removing earth to make basin, and or the placement of an earthen or concrete dam,  is placed at a strategic location along a natural slope or drainage area.  When it rains, water, channeled by the natural terrain slope and or terraces, empties into the pond. 

Catchment Reservoirs - generally require more land than a water storage pond. However, catchment systems can be designed / constructed on the sides of a mountains, cliffs and hillsides which are not suitable for farming or commercial development.  Consequently, land cost is usually less than for that of a storage pond.  The main advantage of a water catchment reservoir system is that it is low tech, requires almost no maintenance and is very cost efficient.  This method keeps it as simple as possible!


Reverse Osmosis water system (RO System)

Turning salt water into fresh water is dependant upon salt water being forced to move from a stronger saline solution to a weaker solution via through a semi-permeable membrane.

 Please inquire for more information about any of these processes


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