FNB Dusi Canoe Marathon

14-16 February 2019

Water Quality

Sample Site description18-Dec-1824-Dec-1802-Jan-1908-Jan-1915-Jan-1922-Jan-1929-Jan-1905-Feb-19
uMsunduzi at Caluza Bridge43502063464032556131816473305290
uMsunduzi below Kwapata8840104620123602419610760186001267022820
uMsunduzi at Edendale Weir43520920819350>241968360178501500015290
Slangspruit above Duzi confluence2143098041860024196683014500450012910
Duzi at Camps Drift Bridge<100686764889337270368410627550
uMsunduzi above Dorpspruit confl67003448307615767701111991236027230
Dorpspruit just above Townbush stream133417231730201424196547521305560
Townbush Stream just above Dorpspruit41013131203301039306770932014210
Dorpspruit Ohrtmann Road / just above Duzi confluence248908620222405210141360261302014030760
uMsunduzi above Refuse Dump801034483448920816640155312613024810
uMsunduzi above Darvill WWW3880455026903654111996867556043520
uMsunduzi U/S Baynespruit413041902010410657946131738030760
Baynespruit at Greytown Road496068671223072701986344804350129970
Baynespruit behind Epol110601553183307701>2419612740457013130
Baynespruit at Sobantu48840081300260200141360648800920800547500816400
uMsunduzi U/S Darvill mat river104620648809208077010>24196>241966867084200
Darvill Final Effluent normal discharge site2724800161791000135285740
uMsunduzi D/S Darvill mat river>24196101700
uMsunduzi at Motorcross weir9330129974960>2419653705370920845700

 


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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