[avatar user=”Irwin” size=”thumbnail” align=”left” link=”file”]Irwin Juckes[/avatar]
- Quarterly Water Quality reports on the Jukskei River from City of Johannesburg (8 quarters) and Ekurhuleni Metro (14 quarters) were analysed for trends of sewage pollution
- Jukskei River pollution is from sewage unchanged over this period of two to three years
- The sites immediately downstream from the two sewage problem spots (Johannesburg CBD and Alexandra) show almost constant levels of pollution with no seasonal effect
- Sites further downstream from the problem spots show lower pollution and a clear seasonal low in winter
- Whether high or low, all sites have unacceptable levels of sewage pollution
Read here for more background to the Jukskei River catchment and its problems.
Upper Jukskei River *
The site highest upstream is Bez Valley (corner 4th St and 5th Ave), where sewage pollution appears fairly level at an average of 2.1 million E coli counts per 100 ml. Downstream at Bruma E coli have declined to an average of 750 000 and at Lombardy East to 23 000. Ekurhuleni tests coliforms (also an indicator of sewage pollution) at Clarkson Rd in Morninghill, Bedfordview. Over three and a half years there is no trend, but there is a seasonal low in winter.
Alexandra and downstream *
The first monitoring site after Alexandra is Marlboro Bridge, where the E coli counts per 100 ml are fairly constant and above 1 million. Two sites downstream show lower pollution with a more marked winter low, but there is no overall trend.
Lower Jukskei River *
The E coli counts downstream from Northern Wastewater Treatment Works (NWTW) are fairly constant around 100 000 per 100 ml, which is about 5 to 10-fold higher than at the site upstream. This shows increased sewage pollution from the NWTW. The last two quarters are very similar, due to an increase at the upstream site. There is no trend over time.