39
Table 9. Class of Water and the Usage PP 822001
Class Intention of Usage
First Class Drinking waters, or any other use with the similar requirements.
Second Class Service water, recreational, gardening or any other use with the similar requirements.
Third Class Fresh water aquacultures, farming, , or any other use with the similar requirements.
Fourth Class Irrigation water or any other use with the similar requirements.
Fifth Class
Lower quality than the above classes
3.11.3.2 Evaluation of Water Quality Status Using Storet Method
The determination of water quality status by Stored methods is to compare between water quality and water quality standard according to the suitable using. The classification
of water quality status as a result as following on Table 10, which is to show the total
score higher than water quality standardBaku Mutu Air, BMA and water quality status and also pollution level. The number of score is found from the evaluation for each water
quality parameter and its frequency or number of datanumber of sample which is higher
than BMA on certain monitoring site. Table 11 shows the method of calculating. The
assumption of the methods is follows: 1
Every parameter which fulfills BMA has been scored null 0. 2
Every parameter which is not fulfilling BMA has been scored minus 1 -1. This also applicable to a single data, a time series of data where n 10. Chemical’s parameter
which is not fulfilling BMA, scored valued is minus 2 -2. Biology’s parameter which is not fulfils BMA, scored valued is minus 3 -3.
3 Parameters which their average values are not fulfils BMA in term of number of data or
sample 10 has been scored of physics -3, chemistry -6 and Biology -9. 4
Whenever the number of data or number of samples for time series more than 10, the final score multiplies by 2.
40
Table 10 Scoring Procedure of Water Quality Parameters BPLHD, 2006
Number of data samples
Description Score of Parameter not fulfils
BMA Physics
Chemistry Biology
1 Single
-1 -2
-3 10
Maximum -1
-2 -3
Minimum -1
-2 -3
Average -3
-6 -9
= 10 Maximum
-2 -4
-6 Minimum
-2 -4
-6 Average
-6 -12
-18 Fulfils the
Requirements
Table 11. Relation Between Score and Water Quality Status
BPLHD, 2006
Total Score Quality Status
Pollution Level
A Fulfil Standard Water Quality
-1 to -10 B
Lightly polluted -11 to -30
C Polluted
Less than -31 D
Heavily polluted
Evaluating the water quality with STORET can be applied through current or time series data. Quality status and pollution level obtained from the total score, which reflect
the number of unfulfilled parameter’s score, more numbers means more pollution in water. STORET evaluation method does not have the way to evaluate the degree of
pollutions, this only show the conformation toward the standard. This is differ with the evaluation of water quality based on the class, where higher degree of pollution make the
41 higher number of class, even this caused by one parameter only. Example; The status of
water from Citarum River, sample taken at Nanjung, October 2004: 1
From one sample, evaluation gave the score -19, therefore conclude as C category heavily polluted.
2 At the same year, with 3 set of data from multiple samples, therefore data have the
range of minimum, maximum and average values, gave the score -83, therefore conclude as D category heavily polluted.
3.11.3.3 Evaluation of Water Quality Status Using Pollution Index Method
