Select an Issue from the Menu


WATER QULAITY INDEX

CURRENT BACTERIAL AND CHEMICAL WATER INDEX FOR SURFACE WATER (Cydna Laboratories, 1999)
health1.gif (3043 bytes)

 

Parameter

E.coli

Phosphate

Nitrate/nitrite

Ammonia

Conductivity

DO

Turbidity

Sulphates

Chlorophyll

COD

Suspended solids

Score
Indicator of Sewage Algal growth potential Trophic status, algal growth potential Sewage, anaerobic conditions, algal growth potential Total dissolved salts, inorganic pollution Bio-degradable pollution, anaerobic conditions Particulate matter, erosion, algal growth Mine pollution Algal growth Bio-degradable pollution Particulate matter, erosion, siltation, aesthetics  
Concentration ranges <130 per 100ml <0.2mg/l <6.0 mg/l <0.03 mg/l 0 – 70ms/m >9.0 mg/l <1.0 NTU <200 mg/l <1.5 <20 mg/l <4.0 mg/l 95
  130 – 600 0.2 – 0.4 6.0 - 10 0.03 – 0.3 70 -150 5.0 – 9.0 1.0 – 5.0 200 - 400 1.5 – 3.0 20 - 35 4.0 – 8.0 82
  600 – 2000 0.4 – 0.5 10 - 15 0.3 – 0.8 150 - 300 4.0 – 5.0 5.0 – 8.0 400 - 500 3.0 – 5.0 35 - 45 8.0 - 15 67
  2000 – 50000 0.5 – 0.6 15 - 20 0.8 – 3.0 300 - 450   8.0 - 10 500 - 600 5.0 – 9.0 45 - 55 15 – 25 52
  > 50000 >0.6 >20 >3.0 >450 <4.0 >10 >600 >9.0 >55 >25 37
Source   Klip River forum DWAF domestic DWAF aquaculture DWAF Klip River forum DWAF Klip River forum Umgeni Klip River forum Klip river forum  
Weighting 1 – bact 7 - chem   6 - chem 4 - chem 3 - chem 2 - chem 1 - chem 5 - chem 3 - chem 2 – chem  

 

Class

Index

Colour

Description
A >85 Blue Ideal
B 75 - 85 Green Good
C 60 – 74 Yellow Acceptable
D 45 – 59 Orange Unacceptable
E <45 Red Bad

 

The index is calculated as follows:

Each parameter is given the score for the concentration range in which its concentration falls. The score is multiplied by the weighting factors. All scores are summed and divided by the sum of the weighting factors. This final figure is the index.
 

The Geographic Information files are WinZiped and  best viewed with ArcExplorer - (Click to download)
Unep United Nations unep. ceroi Ugland Publikit icleilogo.gif (1313 bytes)
wpe9.jpg (4277 bytes)

Home Page   Java Navigation

wpe9.jpg (4277 bytes)

Please Reference the Copyright with the Greater Johannesburg Metropolitan Council.
For problems or questions regarding this web contact  the Web Editor. Matthew 4:19
Last updated: October 13, 1999.
Thanks for visiting, you are visitor number:Hit Counter