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Residential, commercial and industrial developments result in a large proportion of virgin land becoming sealed by impermeablesurfaces including roofs, parking areas and roads. When rain falls on these surfaces, water rapidly flows into drains and is discharged into nearby watercourses. Surface runoff can rise to 80% of total rainfall.
As a consequence, following storms, watercourses receiving the runoff must cope with larger and more intense flows, creating an increased risk of flooding and soil erosion. Furthermore, the vastly reduced infiltration contributes to the depletion of groundwater reserves.
As a stormwater management option, rainfall can and should be harvested, stored and reused for garden watering, laundry and toilet flushing applications which combined can comprise up to 70% of a typical household’s annual potable water use.
AQUACELL® provides a means of infiltrating, attenuating, storing and conveying rainwater.
• INFILTRATION
Rainwater is collected in AQUACELL ® galleries and allowed to seep into the surrounding soil over a period of time after the rain has stopped. To protect the gallery from silt and surface pollution, it is recommended a Flofast CPI Filter be installed up stream.
• ATTENUATION
Stormwater is collected in an AQUACELL ® detention gallery and released at a reduced rate through a flow control device into an appropriate outfall. This reduces peak flows in the receiving waters/ pipe outfall, thereby minimising the risk of flooding, erosion and potentially deferring the need to replace hydraulically inadequate stormwater pipes.
• STORAGE AND REUSE
Rainwater from roofs is directed into an AOUACELL ® storage tank discretely located beneath driveways, lawns, garages and other trafficable or nontrafficable surfaces. A Flow Control Filter Unit removes leaves and fine sediments from inflows, thereby protecting the AQUACELL ® storage tank from siltation. Water collected in the tank is suitable for garden watering, laundry use and toilet flushing.
• CONVEYANCE
To improve the performance of swale drains and filter strips, lplex have developed the AquaSwale, utilising AquaCell galleries under a structured turf zone to provide a low maintenance, low impact stormwater management solution.
AquaSwales are a tailored solution to meet the site-specific demands of both subdivisional and commercial developments, recognising the very differing climatic environmental constraints within New Zealand. AquaSwales can also provide infiltration, attentuation and water reuse options.
