BASIN: Water Quality Index for July, 2006 at Boulder Creek at Orodell


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for July, 2006 at Boulder Creek at Orodell

Grade B For July, 2006 the WQI rating at Boulder Creek at Orodell (BC-ORO) was Good (B) due to a WQI value of 86.15. 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	94.00	96.40	0.17	16.39
Fecal Coliform	#/100 mL	20.00	61.54	0.16	9.85
pH	pH	7.27	92.62	0.11	10.19
Total Phosphate	mg PO4/L	0.03	98.23	0.10	9.82
Nitrates	mg NO3/L	Data Unavailable
Turbidity	NTU	2.44	91.31	0.08	7.30
Total Solids	mg/l	21.00	84.19	0.07	5.89
Totals (factors, total)				0.69	59.44
Adjusted WQI					86.15

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.

WQI at Upstream Station: North Boulder Creek at Boulder Falls

WQI at Downstream Station: Boulder Creek at Eben G. Fine Park

WQI for June at this station

WQI for August at this station

Return to WQI map for July

Thank You! BASIN was a community project which benefitted from over 1000 hours of public volunteer time. BASIN was highlighted by the US EPA in a national case study in its 2001 handbook Delivering Timely Environmental Information to Your Community. Thank you to all volunteers, and especially to the late Jim Waterman, BASIN Project Coordinator!