FNB Dusi Canoe Marathon

14-16 February 2019

Water Quality

Sample Site description08-Jan-1915-Jan-1922-Jan-1929-Jan-1905-Feb-1912-Feb-1919-Feb-1926-Feb-19
uMsunduzi at Caluza Bridge3255613181647330529079806302359
uMsunduzi below Kwapata2419610760186001267022820419001374038730
uMsunduzi at Edendale Weir>24196836017850150001529025000565010170
Slangspruit above Duzi confluence241966830145004500129103076002909011120
Duzi at Camps Drift Bridge9337270368410627550770102359010140
uMsunduzi above Dorpspruit confl1576770111199123602723081640240004260
Dorpspruit just above Townbush stream20142419654752130556020140025904352
Townbush Stream just above Dorpspruit301039306770932014210146700410057940
Dorpspruit Ohrtmann Road / just above Duzi confluence5210141360261302014030760373002500051720
uMsunduzi above Refuse Dump920816640155312613024810759002310011600
uMsunduzi above Darvill WWW365411199686755604352014390015940630
uMsunduzi U/S Baynespruit410657946131738030760122300117806500
Baynespruit at Greytown Road727019863448043501299703255006131028510
Baynespruit behind Epol7701>24196127404570131301789001500020980
Baynespruit at Sobantu141360648800920800547500816400648800727000>241960
uMsunduzi U/S Darvill mat river77010>24196>24196686708420021430010462098040
Darvill Final Effluent normal discharge site7910001352857401413600156402
uMsunduzi D/S Darvill mat river>24196101700
uMsunduzi at Motorcross weir>24196537053709208457003448004611054750

 


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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