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| Glossary ยป I |
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GlossaryThis glossary is copied from the Stormwater Manual of Western Australia Chapter 11: Further Information. References are available from this chapter. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z IIllicit connections: Illegal or improper connections to drainage systems and receiving waters. The most obvious of these connections include trade wastes from commercial and industrial premises and wastewater from domestic premises. Impermeable or impervious surface: The part of the catchment surfaced with materials, either natural or constructed, which prevent or limit the rate of infiltration of stormwater into the underlying soil and groundwater (ARMCANZ & ANZECC 2000) and subsequently increases stormwater runoff flows. Indicators: The specific characteristics or phenomena that tell you about the project and what impact it is having on the problem or issue it was set up to tackle (Woodhill & Robins 1998). Indirect drainage: The breaking of the direct connection of stormwater pipes and impervious area runoff to the drainage network, by their discharge to pervious areas or infiltration devices. Infiltration: The movement of water from the surface to the subsoil and at times, ultimately to the underlying aquifer. Infiltration system: A drainage facility designed to use the hydrologic process of stormwater runoff soaking into the ground, commonly referred to as percolation. Examples include infiltration basins and trenches, soakwells and pervious paving. Inlet: A form of connection between the ground surface and a stormwater structural control for the admission of stormwater runoff. Integrated water cycle management (IWCM): The integration of water supply, sewerage and stormwater, so that water is used optimally within a catchment resource, State and national policy context. It promotes the coordinated planning, development and management of water, land and related resources (including energy use) that are linked to urban areas and the application of WSUD principles within the built urban environment. (National Water Commission 2006.) |
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