Stormwater Design

Stormwater Design and Integrated Catchment Management

Providing for the control of peak stormwater flows while managing the catchment wide effects and risks of the discharge of contaminants to the environment is a matter of growing concern for many communities and regulatory authorities.  The challenges today require an integrated approach to stormwater design that controls floodwaters and protects our natural streams, wetlands, lakes, harbours and coastal environments.

Harrison Grierson engineers provide location specific expertise in developing catchment and stormwater management strategies for each project. Our planning and design methods integrate conveyance with flood control, water quality, the protection of natural areas and access for the public to recreational spaces.  Our experience extends from improving an existing stormwater system to developing a completely new integrated catchment management plan taking into account the predicted effects of climate change.

Greater attention is now being paid to Low Impact Design to reduce the footprint of urban areas on the environment and to reduce energy and material use and waste. Low impact design comprises practices that utilise natural systems and low impact technologies. Key elements include using stormwater design to work with nature, avoiding or minimising impervious surfaces, minimising earthworks in construction and utilising vegetation to assist in trapping sediment and pollutants.

	Matamata Industrial Area Overland Flowpath for Matamata Piako District Council To alleviate the ponding of stormwater in the very topographically flat Matamata township an overland flow path was required to convey major stormwater flows from... view pdf
	Northcote Stormwater Management for North Shore City Council As part of improving the existing stormwater reticulation system, an overland flow path is to be designated and constructed while investigating the feasibility of day-lighting a section of stream... view pdf
	Pokeno Catchment Management Plan for Franklin District Council & Pokeno Landowner Consortium The purpose of the Stormwater CMP is to achieve the best practicable stormwater management of the effects of development within the Pokeno catchment... view pdf
	Stormwater renewals and Augmentation for New Plymouth District Council The aim of this project is to deal with undercapacity in the existing stormwater reticulation system in six areas of New Plymouth... view pdf
	Bassant Reserve Stormwater Wetland for Auckland City Council The project was undertaken to improve stormwater quality within the catchment by treating the runoff from the upstream industrial catchment. A key element of the project was to remediate the existing site… view pdf
	Dempsey Street Stormwater Upgrade for Auckland City Council Significant flooding risks were identified within this catchment in the form of potential surface flooding to existing habitable floors and road flooding.  A number of solution options were considered with a major pipeline option chosen for...  view pdf