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Stormwater ingress in South African sewer systems: understanding the problem and dealing with it
Expanded Title:Stormwater ingress into sewer networks is a world wide problem. However, it is particularly bad in South Africa and in South Africa, the Msunduzi Municipality is acutely affected, with peak sewer flows tripling or even quadrupling during times of heavy rain, and with average daily flows doubling and remaining elevated for a substantial period after rain. This study therefore, used Msunduzi municipality as a case study to evaluate the extent of the problem, the inventions required, the bylaws applicable, the inspection programmes that can be managed by municipalities without significant cost and the enforcement methods applied. The study showed clearly that rainfall events and sewers overflowing can be linked to illegal connections, and that sewers and wastewater treatment plants are severely impacted during rainfall events even if only 10% of the houses have illegal connections. It is important to note that people connected illegally to sewers to prevent their properties from being flooded, thus there was a need for municipalities to evaluate stormwater management options especially in previously disadvantaged areas. Finally , the study demonstrated that a simple inspection programme could be created and successfully implemented by training and using local unemployed people. Public awareness and community education campaigns can serve to reduce the stormwater load at source and provide an alternative to upgrading infrastructure which is capital intensive and time consuming. The study provided information on stormwater ingress in a pamphlet and distributed it to a sample of residents for this report, and this was found to increase awareness of stormwater ingress by up to 20% in the targeted areas relative to nearby areas which were not targeted. This was significant given the limited duration and scope of the intervention. For an awareness and education campaign to be really effective, however, it would need to be part of a co-ordinated city wide campaign followed up by extensive inspections and backed up by the political will to deal with transgressors.
Date Published:01/03/2011
Document Type:Research Report
Document Subjects:Wastewater Management - Sewers
Document Keywords:Municipality, Operation and Maintenance
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1731/1/11
ISBN No:978-1-4312-0119-8
Authors:Erskine S U; Booth A; Still D
Project No:K5/1731
Document Size:9 710 KB
Attachments:Executive Summary for 1731.pdf
Table of Contents for 1731.pdf
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