Author:Auckland Regional Council
Source:Auckland Regional Council
Human land-based activities generate contaminants. In fresh and saline receiving waters these contaminants can and do cause problems for ecological and human health. Stormwater runoff is a major transport mechanism of land-derived contaminants into aquatic receiving environments. Overseas and New Zealand specific information indicates that serious and widespread adverse effects can result from inputs of stormwater-borne contaminants into receiving waters. In addition, increased quantities of stormwater may impact on downstream flood levels and stream channel physical structure.
Stormwater management can help reduce these impacts. Stormwater management involves careful application of site design principles, construction practices, and maintenance operations to prevent sediment and other contaminants from entering surface water, groundwater, or our coastal environments.
The objective of this manual is to provide a commonly accepted design approach for stormwater management practices that will provide both water quantity and water quality benefits, thus benefiting the wider environmental issues we face. Individual development sites may at times present unique issues and the use of standardised design approaches may not be entirely appropriate but most sites will find that the approaches detailed in the manual will help meet Resource Management Act objectives.
Auckland Regional Council technical publication, TP10
Second edition, May 2003.