oa Civil Engineering = Siviele Ingenieurswese - The use of geosynthetics on a large outfall sewer traversing a wetland site



Geosynthetics fulfilled various functions to ensure that the integrity of an internationally proclaimed wetland would not be compromised The DD5A Regional Outfall Sewer of the East Rand Water Care Company (ERWAT) traverses an area alongside the Blesbokspruit, an internationally proclaimed Ramsar wetland site. This article descriptionbes the use of geosynthetics, for tensile reinforcement during construction, as a geo-beam to prevent uplift and as an encirclement of a filter transport layer to facilitate identification of leakage in a post-construction monitoring programme. This latter action was deemed necessary as part of an Environmental Management Plan instigated by the client to ensure that the integrity of the environment would not be degraded owing to the location of a major sewer line over an environmentally sensitive area.


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