FNB Dusi Canoe Marathon

14-16 February 2019

Water Quality

Sample Site description30 Oct 1806 Nov 1813 Nov 1816 Nov 1820 Nov 1827 Nov 1804 Dec 1811 Dec 18
uMsunduzi at Caluza Bridge19891726038733500820098041450
uMsunduzi below Kwapata14550125908620248101198011780173296200
uMsunduzi at Edendale Weir2187032550111903500228201236029210430
Slangspruit above Duzi confluence>241961918023820980405950148302909032550
Duzi at Camps Drift Bridge631121163332243109261>24196
uMsunduzi above Dorpspruit confl235917329841281120>2419611370
Dorpspruit just above Townbush stream1664488419561137216015001850
Townbush Stream just above Dorpspruit>24196717020004101236092083090
Dorpspruit Ohrtmann Road / just above Duzi confluence2753081640152902489081640260204352014700
uMsunduzi above Refuse Dump7660387306970248102014014970325505570
uMsunduzi above Darvill WWW275530760178226904640120334040
uMsunduzi U/S Baynespruit18423255023103950471092083310
Baynespruit at Greytown Road84002755063009330156507270011060
Baynespruit behind Epol1119043520111990101908360233302613012500
Baynespruit at Sobantu>241960248100>2419601203300>2419600248100241960435200
uMsunduzi U/S Darvill mat river86640198630727008164017329014136098040120330
Darvill Final Effluent normal discharge site86010013151200461116070120250
uMsunduzi D/S Darvill mat river1413602420
uMsunduzi at Motorcross weir7170866406370260204870218701565012960



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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