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Boulder Creek at 61st St. |
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Boulder Creek at 61st St. |
For December, 2002 the WQI rating at Boulder Creek at 61st St. (BC-61) was Good (B) due to a WQI value of 81.16.
The chart below details the WQI calulations at this site. See the detailed explanation of the WQI method for more information.
| Parameter | Unit | Parameter Value | Q-value | Weight Factor | Total |
|---|---|---|---|---|---|
| DO% | % sat | 124.50 | 88.45 | 0.17 | 15.04 |
| Fecal Coliform | #/100 mL | 80.00 | 44.37 | 0.16 | 7.10 |
| pH | pH | 7.68 | 92.79 | 0.11 | 10.21 |
| Total Phosphate | mg PO4/L | 0.11 | 94.35 | 0.10 | 9.44 |
| Nitrates | mg NO3/L | 0.20 | 97.73 | 0.10 | 9.77 |
| Turbidity | NTU | 4.34 | 86.39 | 0.08 | 6.91 |
| Total Solids | mg/l | 3.40 | 80.81 | 0.07 | 5.66 |
| Totals (factors, total) | 0.79 | 64.12 | |||
| Adjusted WQI | 81.16 | ||||
The WQI is computed by converting measured Water Quality Parameters to "Q-Values" using charts developed by the National Sanitation Foundation (NSF) water quality scientists. The Q-Values are then multiplied by a weighting factor based on the importance of that water quality parameter. These values are totaled and then divided by the sum of the weight factors.