FNB Dusi Canoe Marathon

15-17 February 2018

Water Quality

Site23 Jan30 Jan6 Feb13 Feb
uMsunduzi at Caluza Bridge7540648817308200
Pata Lowest Bridge Before Police Station2419602755001210037700
uMsunduzi below Kwapata19863>2419646110141360
Ashdown stream @ Duzi Confluence>2419604106003076002000
uMsunduzi at Edendale Weir13760238201145061310
Masons Mill Stream95907800134019680
Duzi inflow @ Edendale Bridge990085701317054750
Slangspruit above Duzi confluence27230115305370241960
Slangspruit CD inflow Duzi Confluence17329073003450241960
Makro SWD Under bridge173290310<100122
Duzi at Camps Drift Bridge683035902247021870
uMsunduzi above Dorpspruit confl18506694884173290
Dorpspruit just above Townbush stream1203302560201023800
Townbush Stream just above Dorpspruit74407540278017100
Dorp. Manning Avenue Bridge Traffic Circle488408570389015760
Dorpspruit Ohrtmann Road / just above Duzi confluence77010>2419603270040200
uMsunduzi above Refuse Dump129973654579492080
Blackboroughspruit @ New England refuse site15650980419032550
uMsunduzi above Darvill WWW43701935627098040
uMsunduzi U/S Baynespruit2098044302490111990
Baynespruit at Greytown Road1421096001201051720
Baynespruit behind Epol166409320359030760
Baynespruit at Sobantu686700435200727000233300
Baynespruit below Sobantu Pump Station>241960816400488400>241960
uMsunduzi U/S Darvill mat river15531017329020980111990
Darvill Final Effluent normal discharge site528108193120
uMsunduzi D/S Darvill mat river68670
uMsunduzi at Motorcross weir>2419664882602155310
Duzi Grimthorpe Ave6488046403270129970
Duzi @ Campbells-Doornhoek27801100299052470

 


WHAT DO E. COLI NUMBERS MEAN?

DUCT’s River Water Quality Assessment Guidelines updated 27 October 2013

E. coli bacteria occur naturally within mammal digestive systems and most of them are not harmful in any way. However, because they are so common E. coli data are considered useful as a general indicator of a wide range of other potential human pathogens, and thus also of the possible presence of sewage related water quality problems. In the absence of other data, E. coli numbers are useful in allowing a general assessment of other potential water quality risks.

E. coli count/100mL
Water quality “assessment”
Assessment of probable risk to canoeists

*0 – 130
  WaterExcellent Excellent – Considered acceptable for full contact recreation – excellent / likely natural catchment.
Extremely low risk.

130 – 1000
WaterGood Good – within the range expected for quite good catchment conditions, but significant / increasing risk of illness if used for full contact recreation (e.g. swimming). Very low risk.

1001 – 4000
WaterFair Fair resource condition, natural sources (i.e. not sewage related) are still possibly the E. coli source, but increasing likelihood of human faecal / sewage contamination at the upper end of this range. Unacceptable for swimming. Low, but increasing risk.

4 001 – 10 000
WaterPoor Degraded – Significant faecal input or some sewage contamination is indicated. Other water quality parameters are likely to be poor.
Moderate risk (approx. 1 in 10 may get sick).

10 001 – 25 000
WaterVeryPoor Unacceptably Poor, sewage contamination definitely present.
Moderately high canoeing risk (approx. 1 in 5 may get sick) – some likelihood of illness esp. in white water.

25 001 – 50 000
WaterDangerous Bad, with significant sewage contamination and negative environmental consequences.
High risk (approx. 1 in 3 may get sick) – consider not canoeing or paddle on flat water only, with no risk of falling out.

>50 000
WaterVeryDangerous Severely contaminated with significant sewage contamination and negative environmental consequences.
Very High canoeing risk – (approx. 1 in 2 paddlers may get sick). Avoid canoeing!

*Note, the only acceptable value for drinking water quality is ZERO E.coli counts per 100 mℓ. No naturally occurring surface water should be expected to have E. coli this low (even in large dams). If zero E. coli results are achieved for a natural water, contamination by disinfectants is the likely cause and this may be masking other significant potential pollutants.

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