The STORM_osd product is a compact device that provides boundary stormwater management by reducing the rate of release from site drainage to public infrastructure. This process is referred to as retention/detention where the device holds the bulk of the site stormwater and slowly releases it through an orifice that has been calibrated for the hydraulic specifictions. The device also has a high level overflow that allows the safe overflow for peak intensity storms that may exceed the design specifications, or system blockages, etc.
An optional external basket type screen that is accessible without needing access into the confined space of the tank can be applied to the tank inlet to avoid tank blockages. A ground level extender is also available to make installation flexible to suit site needs.
The One Water OSD package allows selection of the essential parameters like the tank size, the orifice outlet and the lid loading to provide a configurable product assembly.
The single dwelling scenario:
The single dwelling scenario consists of a 600 m2 allotment, a house with a roof area of 150 m2 and a paved surface area of 200 m2 (Figure 6). Applying the OSD rules from the UPRCT On-Site Detention Handbook to this site results in a site storage volume of 28.2 m3, a 48 mm diameter orifice plate outlet to provide a permissible site discharge (PSD) of 0.0048 m3/s to the street drainage system.
{ref: RAINWATER TANK OPTIONS FOR STORMWATER MANAGEMENT IN THE UPPER PARRAMATTA RIVER CATCHMENT, Coombes, Frost, Kuczera, O’Loughlin and Lees 1999}
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