How Stormwater treatment trainS workA stormwater treatment train typically consists of pretreatment, detention, and filtration in an integrated system.

Why is Stormwater Management Important?

Stormwater is rainwater and melted snow that runs off streets, parking lots, roofs, and other impervious surfaces. When stormwater is absorbed into the ground, it is filtered and ultimately replenishes aquifers or flows into streams and rivers. In developed areas, the water runs rapidly into storm drains, sewer systems, and drainage ditches and can cause:

• Downstream flooding • Stream bank erosion • Increased turbidity (muddiness created by stirred up sediment) • Habitat destruction• Changes in the stream flow • Combined sewer overflows• Infrastructure damage • Contaminated streams, rivers, and coastal water

Proper stormwater management can mitigate these issues.

Two Essential Functions of a Stormwater Management System

1. Water Quantity Control - Maintaining pre-development hydrology to minimize downstream erosion and flooding

2. Water Quality Control - preventing pollutants from impacting our waterways

ENGINEERED SOLUTIONS

800-338-1122 | www.conteches.com/rwh

Hydrodynamic Separation

Detention Retention

Filtration

Rainwater Harvesting

Pretreatment – Improves water quality by removing trash, debris, and solids, and reduces maintenance of downstream structures.

Detention/Infiltration – Reduces the quantity of stormwater runoff leaving a site by temporarily storing the runoff and releasing it slowly over time to surrounding soils or downstream facilities.

Optional Filtration – Improves water quality by filtering runoff to remove the most challenging pollutants, including fine solids, heavy metals, and nutrients.

Rainwater Harvesting - With the addition of pumps and controls, captured runoff can be used on site for irrigation and other non-potable uses thereby reducing runoff.

40% Evapotranspiration

50% Infiltration

10% Runoff

NaTuRal GROuND COvER0% Impervious Surface

30% Evapotranspiration

15% Infiltration

55% Runoff

HIGH DESNTIy RESIDENTIal/INDuSTRIal/COMMERCIal74% - 100% Impervious Surface

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