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Introduction

Rainwater represents a potentially substantial source of usable water in the urban environment – but it largely goes to waste at present. In 2010 the City of Cape Town had a freshwater supply of 556 million m3 and demand of 511 million m3, with a growth rate of 2% per annum it is estimated that by 2014 the demand for freshwater would be higher than the available supply. The City of Cape Town is currently considering new ways of sourcing freshwater to meet the growing demand.

 

Research was carried out to determine:

  • The total amout of rainwater that could be collected in Paarden Island;

  • The concentration of heavy metals in the ground surface water runoff; and 

  • Determine the number of properties that will be able to feasibly implement rainwater harvesting systems.

 

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