Stormwater Design
and Management

The key objective of Stormwater Design and Management is to control the runoff of stormwater on a site/sites such that erosion and other unwanted consequences are minimized. A stormwater management report, including design and methodology, is required during the process of town establishment. Therein one must indicate the expected runoff volumes prior to development and after development for 1 in 5, 25 and 50-year return intervals. Town establishment requires that the developer considers the construction of attenuation structures to satisfy the induced runoff volumes as required by the Local Authority. Singular erven have similar requirements, albeit to a lesser degree, to control the additional runoff induced by construction on site.

The scope of services includes general assessment of the site and development conditions; assessment of site contours; compilation of a contour layout plan; calculation of expected runoff volumes; design of stormwater infrastructure to the satisfaction of the Local Authority; compilation of a Stormwater Management Plan; and compilation of a Stormwater Management Report. Deliverables include a Stormwater Management Plan and a Stormwater Management Report.