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Boulder Creek at 61st St. |
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Boulder Creek at 61st St. |
For October, 2002 the WQI rating at Boulder Creek at 61st St. (BC-61) was Good (B) due to a WQI value of 75.06.
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 | 118.10 | 92.35 | 0.17 | 15.70 |
| Fecal Coliform | #/100 mL | 230.00 | 32.12 | 0.16 | 5.14 |
| pH | pH | 8.48 | 70.49 | 0.11 | 7.75 |
| Total Phosphate | mg PO4/L | 0.09 | 95.32 | 0.10 | 9.53 |
| Nitrates | mg NO3/L | 0.10 | 97.90 | 0.10 | 9.79 |
| Turbidity | NTU | 8.00 | 78.69 | 0.08 | 6.30 |
| Total Solids | mg/l | 183.00 | 72.74 | 0.07 | 5.09 |
| Totals (factors, total) | 0.79 | 59.30 | |||
| Adjusted WQI | 75.06 | ||||
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.