Drainage systems are usually designed as two separate elements The underground

Drainage systems are usually designed as two separate

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Drainage systems are usually designed as two separate elements. The underground piped network transports stormwater flows for minor storm events (generally flows of up to 1 in 5 ARI). The piped network has sufficient capacity to contain nuisance flows and reduces the frequency and quantity of surface flows. The major drainage system caters for flows in excess of the piped network and usually consists of floodways, road reserves or natural waterways. The major drainage system prevents stormwater damage to properties and transports the stormwater to the receiving sump or main drain. The frequency at which the overland drainage system operates is determined by the design criteria of the piped network. Diagram 5 – Drainage system behaviour during minor & major storm events Source: Australian Rainfall & Runoff 1987 Diagram 6 – Possible major & minor design standards Source: Australian Rainfall & Runoff 1987 Minor Major
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Classification Stormwater Asset Asset Function Trunk Stormwater Pipe Transports the stormwater design flows of up to 1 in 20 ARI, to other trunk mains, basins, channels, while maintaining the flood risk of any surcharge to acceptable levels. Node Box Culvert Pipe Culvert Minor Stormwater Pipe Transports the stormwater design flows of less than 1 in 10 ARI, to other reticulation mains, basins, channels, while maintaining the flood risk of any surcharge to acceptable levels. Node Box Culvert Pipe Culvert Water Quality GPTs Remove large items of debris at the design flow rate without blockage and once full or at design bypass flow rate, permit bypass of flow and debris without blockage Basin Sumps Provide temporary stormwater storage or detention to ease stormwater runoff peaks, which are generated by significant storm events, for flood protection of downstream urban areas. Retention basins can also provide additional purposes such as water quality treatment and landscape amenity. Basin Pump Station Pump Stations An intermediate storage / collecting chamber incorporating pump sets which transfers the stormwater. Pump stations are used where a normal gravity system cannot be, either because there is insufficient grade or the collecting point is lower than the receiving pipe.
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4. Stormwater Drainage Condition Assessment This stormwater drainage inspection manual has been specifically designed for use by the City. The primary purpose of this manual is to act as a guide for visually assessing the condition of the stormwater drainage assets in a systematic and consistent manner. Accurate, precise identification of visual condition distresses ensures consistent, reliable condition data. As stormwater pipes are buried underground, a visual assessment of the pipe network is conducted with the use of a remote controlled Closed Circuit Television Unit (CCTV).
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