Selection of Water Quality Monitoring Stations - Water Quality Management: Assessment and Interpretation - page 13

2.5 Application of Sanders Method

In a study, designing the number of water quality monitoring stations on the K n

River, Iran, was carried out. We applied the Sanders method on the basis of
irrigation and drinking water quality indices. The speci

ā r ū

ed sites were compared to
the existing sites in the system and the matched stations to this scheme were
selected. Water quality sampling was carried out on 20 stations by the Iranian
Department of Environment (DOE) in Khuzestan Province during the years
1995 2005. (Table 2.2 and Fig. 2.1 ).

At the

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first step, the catchment area (Fig. 2.2 ) was divided into four sub-basins
which were named A, B, C and D. Gotvand Dam to Band-e-Gheer, Dez Dam to
Band-e-Gheer, Band-e-Gheer to the south of Ahvaz City and Darkhoveyn to the
Persian Gulf were considered as sub-basins A, B, C and D, respectively. Water
quality parameters including the Biochemical Oxygen Demand (BOD), Chemical
Oxygen Demand (COD) as degradable and Total Dissolved Solid (TDS) as the non
degradable were selected which weighted by coef cients of 0.2, 0.3 and 0.5,

respectively. The combined results of these coef cients were the basis of the

evaluation and weighting of the amount of pollution discharged by each of the
pollution sources. For this matter, the mass discharge of ef

uent BOD, COD and
TDS along with their weighting percentage for each pollution source of all sub-
basins were calculated (Tables 2.3 , 2.4 , 2.5 and 2.6 ). Then, by adding the number of
entering branches, as presented in the Fig. 2.2 , and allocation one of the number of
the main branches of the river, the number of pollutants entering each pollution
source was calculated.
As an example, for Pars Paper Factory in sub-basin B, BOD, COD and TDS
weighting percentages due to their total values, are 19.87, 57.36 and 10.8. The
pollution load of this factory is calculated as follows:
0.2(19.87) + 0.3(57.36) + 0.5(1.08) = 21.7 22

Table 2.2 Monitoring Station on the K ā r ū n River

Station number Station name Station number Station name

1 Gotvand 11 K ā r ū n Band-e-Gheer

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2 K ā r ū n - Band-e-Mizan 12 Mollasani

3 Shotayt Arab Asad 13 Zargan

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4 Shotayt Band-e-Gheer 14 Pol-e-panjom

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5 Gargar - Shushtar 15 Ommotamir

6 Kargar - Band-e-Gheer 16 Darkhoveyn

7 Dez Chamgolak 17 Saboon sazi

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8 Dez Ab-e-sheerin 18 Haffar

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9 Dez - Mostoa 19 Abolhasan

10 Dez Band-e-Gheer 20 Choabadeh

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