Introduction
This section sets out requirements for the design and construction of stormwater systems for land development, subdivision, and contracts. Stormwater systems have the potential to convey pollutants and increase the flow rate and volume of water to a receiving environment such as streams (natural and modified), rivers, lakes and groundwater. Discharges will impact on these environments and the environmental, cultural and social values which they support. The management of stormwater discharges must respond to the pollutant and hydrologic characteristics attributable to the catchment land use and provide treatment to reduce or mitigate adverse impacts. The RITS provides high level guidance to designers with an understanding of the key design considerations to support good performance outcomes. Furthermore, specific design guidance can be sought from other existing technical resources such as the Waikato Regional Council’s Waikato Stormwater Management Guideline, Waikato Stormwater Runoff Modelling Guideline and Bay of Plenty Regional Council’s guideline documents.