BASIN: Water Quality Index for August, 2006 at North Boulder Creek diversion to Lakewood


	City of Boulder/USGS Water Quality Monitoring
	Water Quality Index for August, 2006 at North Boulder Creek diversion to Lakewood

Grade A For August, 2006 the WQI rating at North Boulder Creek diversion to Lakewood (NBC-Lw) was Excellent (A) due to a WQI value of 94.56. 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	102.97	98.84	0.17	16.80
Fecal Coliform	#/100 mL	Data Unavailable
pH	pH	7.40	93.61	0.11	10.30
Total Phosphate	mg PO4/L	0.01	98.23	0.10	9.82
Nitrates	mg NO3/L	0.01	98.54	0.10	9.85
Turbidity	NTU	2.96	89.51	0.08	7.16
Total Solids	mg/l	2.30	80.48	0.07	5.63
Totals (factors, total)				0.63	59.57
Adjusted WQI					94.56

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: Middle Boulder Creek Above North Boulder Creek Confluence

WQI at Downstream Station: North Boulder Creek at Boulder Falls

WQI for July at this station

WQI for September at this station

Return to WQI map for August

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!