FNB Dusi Canoe Marathon

14-16 February 2019

Water Quality

Sample Site description28 Aug4 Sept11 Sept18 Sept25 Sept2 Oct9 Oct
uMsunduzi at Caluza Bridge517202098029503090404047104500
uMsunduzi below Kwapata43520648801669026130105804352038730
uMsunduzi at Edendale Weir198630209801989022470123604884011530
Slangspruit above Duzi confluence6010187201565054604410960015150
Duzi at Camps Drift Bridge4352816111994578652481373
uMsunduzi above Dorpspruit confl9329072224344868313966488
Dorpspruit just above Townbush stream1010160716641860325527201710
Townbush Stream just above Dorpspruit141360686700101900410600209800135400118700
Dorpspruit Ohrtmann Road / just above Duzi confluence13340365403255013910866401421010950
uMsunduzi above Refuse Dump686724196104621986319863980415531
uMsunduzi above Darvill WWW43529804816422474611648812997
uMsunduzi U/S Baynespruit4106770136546867325548845492
Baynespruit at Greytown Road1296031803873069704800108103890
Baynespruit behind Epol435202613019350461102755043520>241960
Baynespruit at Sobantu1299700173290011199008164007270006488002419600
uMsunduzi U/S Darvill mat river866401299701119908164098040129970120330
Darvill Final Effluent normal discharge site290972166916131414198
uMsunduzi D/S Darvill mat river8164021870
uMsunduzi at Motorcross weir410698041119968675794547510760

 


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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