While “rainwater” and “stormwater” are terms that are often used interchangeably, there is a difference between the two. “Rainwater” is the relatively clean water coming from rooftops and “stormwater” is more contaminated water coming from landscapes, sidewalks, parking lots and other grade-level surfaces. Depending on the site, stormwater detention or stormwater collection areas can be quite large and often contain contaminants such as silt, hydrocarbons and fertilizers in their stormwater harvesting system. Increasingly, communities are requiring developers to manage their stormwater runoff in order to reduce the load on the local storm system with a stormwater management system.

Wahaso’s stormwater system not only accommodates large quantities of stormwater but provides more robust treatment designed to handle difficult contaminants. The result is a system that provides a safe, treated supply of water that can be used for a variety of non-potable applications.

Stormwater Harvesting Management – WAHASO

Stormwater Detention System Design

Stormwater collected from large properties, parking lots or watersheds can be contaminated with sediment, hydrocarbons, debris and other pollutants. In order to reduce maintenance on the cistern, it is important to pre-filter the stormwater. Wahaso recommends the Nutrient Separating Baffle Box (NSBB), which utilizes screening and hydrodynamic separation to capture the pollutants common in stormwater. The NSBB stores debris in a dry state, minimizing bacterial growth and nutrient leaching in the water.

The proprietary treatment train of Wahaso’s stormwater system is IAMPO 324 certified and filters the harvested water down to 0.02 microns, removing suspended solids as well as bacteria and viruses. Filtered water is sanitized using Ultraviolet (UV) and if required, chlorine, and is then sent to the end use or stored in a processed water holding tank to await re-pressurization. The treated water is safe and suitable for non-potable applications such as toilet flushing, irrigation and cooling tower make-up.

Best Rated Stormwater Management

Best Rated Stormwater Management

IAPMO 324 Certified

A system with third party certification can provide peace of mind that a system is reliable and safe. The Wahaso stormwater system has IAPMO 324 certification, meeting or exceeding all of the standard’s requirements.


System Benefits

  • Turn a Liability into an Asset. Stormwater management often requires a detention system to hold the water for a period of time and release it slowly to the municipal storm system. Instead of releasing the water, why not retain it for reuse? The Wahaso stormwater harvesting system provides a way to collect and treat that water, providing a more sustainable and cost effective solution to stormwater management.
  • Scalable. The Wahaso stormwater system can be Scaled to treat from 2,000 to 200,000 gallons per day or more. 
  • Low Maintenance. The system has been designed to run reliably for long intervals, with minimal maintenance required.
  • Robust Controls. Wahaso’s proprietary control system is custom programmed to monitor and track all system activity.
  • Integrated System Design. Wahaso’s stormwater processing skids are pre-assembled and integrated into comprehensive system designs that include all pumps, storage, filtration, sanitation and controls.

Standard Systems

Wahaso’s stormwater system is fully scalable and able to process 2,000 – 200,000 gallons per day. Each standardized system includes the filtration and sanitation equipment. The customizable equipment includes tanks, pressurization and controls. For more information on our stormwater harvesting systems, download the information sheets.

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