Syndal South Primary School, located in the suburbs of south east Melbourne, was looking for a way to keep their playing fields green during summer and reduce potable water usage. A stormwater harvesting system using the enviss™ Sentinel surface treatment was installed and now saves one megalitre of potable water every year.
Before the system was completed in September 2008 the school was facing another hot summer with very little water to maintain their sports fields due to continuing dry weather and tough water restrictions. A stormwater harvesting system that would capture and treat stormwater using the patented enviss™ filter technology was the applied solution.
The harvesting system was modeled using envissDT™ custom software using 10 years of rainfall data, and took into account the water demands for toilet flushing and irrigation of the sports fields. The model enabled the designers to choose the optimal tank and enviss™ filter sizes to meet demand. As a result, a bank of 60 enviss™ Sentinel filter pits were designed to treat the runoff before it was stored in a 130,000L underground storage installed beneath an existing oval.
By using the enviss™ surface filtration and appropriate storage the school was able to capture rainfall runoff from asphalt play areas and car parks in addition to the rainwater from the buildings, giving an 80% increase in the catchment area. This means more water is collected from each storm and greater mains water savings are made. The enviss™ Sentinel surface treatment makes this possible by removing sediments, nutrients, heavy metals and pathogens from the stormwater prior to it entering the system, resulting in a high quality source of water that is safe to be used in a number of applications.
Syndal South Primary School now saves 1 megalitre of mains water every year, with the harvesting system able to supply 69% of the annual toilet flushing and irrigation demands.
The advantages of the enviss™ Sentinel system is many:
- A high pollutant removal performance that can be achieved in a very small footprint. This can be as little as 0.3% of the impervious catchment area in Melbourne, which is about seven times smaller than comparable technologies.
- Designed to be modular cartridges in order to suit any site and conditions. Cartridges can be combined to create filter areas as small or large as required.
- Easily designed using the custom simulation software, envissDT™. Similar to the industry standard MUSIC software, envissDT™ software simulates the filter over time to assess performance and optimise the size.
- Maintenance is predictable and requires no specialist knowledge or training to replace a filter cartridge.
- Based on passive filtration and requires no chemicals for ongoing use and, in most cases, no energy running costs.
- Extensive testing by Monash University with peer reviewed methods and results. Designers have greater certainty that the systems will perform when compared with vegetated WSUD systems.
To find out more about the enviss™ H20 Sentinel pits contact your local expert from Rocla Water Quality on 131 004.