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Surface Water Retention / Slow Sand Filtration
Description
Surface Water Retention Systems utilize ISSB technology to store water, reinforce channels, and create impermeable surfaces, from which surface water is collected. These systems are similar to Rainwater Harvesting Systems; with the exception that Surface Water Retention Systems capture water after it contacts the ground. Systems range from micro damns and terracing, to embankments and landscape interventions.
Surface Water Retention Systems are used to prevent soil erosion, capture runoff from flash flood zones, and collect excess precipitation that accrues during periodic storms. Retained water is channeled for irrigation or made potable, if economical.Due to the scale of Surface Water Retention Systems it is often worthwile to expand the systems to include Slow Sand Filters. Pictured above is one such configuration of a Surface Water Retention System paired with a Slow Sand Filter.
Slow Sand Filters, are medium to high volume water filters, which use beds of sands, supported by an under drain, to remove low levels of turbidity from surface waters through the action of a biologically active filter layer, which traps turbid particles from passing into the water collected through the under drain.
Slow Sand Filters are used to treat medium to high volumes of water, which are naturally low in turbidity or in which turbid particles have had time to settle out by natural or engineered means.