4/30/13, Boise State University, Dept of Geosciences, Hydrologic Sciences, Jim McNamara Research Director (1999-present), Pam Aishlin site maintenance and data management. Data provided herein is for the Confluence 1 West (C1W) stream measurement site of Dry Creek Experimental Watershed, Boise, Idaho. DATA STREAM: 1. Measurement site was installed by Boise State University in 2004 with data available since 8/19/2004. Instrumentation installed varies over time and may include sensors for stream stage, stream temperature and electrical conductivity measurement. Site maintenance and data collection is provided by Boise State University Hydrologic Sciences. 2. Data files are provided by Campbell Scientific dataloggers and/or self logging instruments, and retrieved either via site visit or telemetry. Files are archived at Boise State University, Hydrologic Sciences, Dept of Geosciences. These raw data files occur at varied data collection intervals, e.g. 10 minute, 30 minute or hourly. ***NOTE: Raw data files are level 0, raw data (CUAHSI HIS standards). (CUAHSI HIS standards, 0 = raw data, 1 = Quality controlled data that have passed quality assurance procedures such as routine estimation of timing and sensor calibration or visual inspection and removal of obvious errors, 2 = Derived products that require scientific and technical interpretation and may include multiple-sensor data. An example is basin average precipitation derived from rain gages using an interpolation procedure.) 3. Select data files are quality checked and post processed for gapfilling, noise filtering and/or corrected according to established instrument calibrations. For stage data, random noise and negative values occuring over short time intervals are replaced with proximate average stage values. During the winter months ice may affect data accuracy, for obvious ice-induced noise (> 5cfs change per time increment occurring in conjunction with freezing temperatures), values are replaced with time range before/after average values. For electrical conductivity, in some instances, negative values are reported when stream is dry, wires are disconnected or other failure occurs. These noise values are replaced with -6999, no data values. Stage-discharge rating curves are applied to continuous stream stage data for output of continuous discharge time series. Where feasible, gaps occuring in the discharge timeseries due to sensor failure/error may be filled via interpolation/regression from same site supplementary instruments or other sites within the same watershed. Raw data timestamps may vary from final output timestamps, in which case raw data will be interpolated for output on the hour. 4. Data as collected and provided is, by protocol, in mountain standard time, year-round. SITE NOTES: Within DCEW, Dry Creek fluvial physical characteristics and process vary between plane-bed, step-pool and cascade reach types (Montgomery-Buffington Classification for Pacific NW mountain fluvial environments). This C1W site is located on a west side, southwest flowing tributary to Dry Creek, for which the confluence with Dry Creek is located approximately midway between the DCEW catchment outlet and headwater source, less than 100 m below site C1E. Riparian vegetation is abundant. Record peak flow at this site (2004-2012) occurred with spring runoff 2006. At this location, the channel is minimally confined, set within a flood plain approximately 200 m wide at this location. For the period of record, flow has remained non-perennial at this site, with no flow typical July through September. A ground water spring, C1S, is located south-adjacent to this tributary site within the tributary floodplain, for which typical flow duration is slightly longer. Instrumentation at this site is installed within stilling wells at stream channel bottom within a shallow reach through which water drains freely over sand-gravel-cobble substrate. On-site measurement of established staff gage values are regressed against on-site discharge measurement to determine stage-discharge rating curves for the site, annually and subannually. On-site discharge measurement has been conducted with velocity-area, dilution and slope-area survey based methods. DATA/INSTRUMENT NOTES: Capacitance logger - Capacitance loggers used prior to 2007 were Trutrack (manufactured in New Zealand) water level sensors that also provided water temperature and air temperature. Solinst - Post 2007, secondary stream sensors installed are solinst water level sensors paired with solinst barometric measurement sensors. These sensors are self-logging instruments acquired from the Canada-based Solinst company. Both sensors provide stream or air temperature and pressure data. The Solinst Levellogger Gold Model 3001 0-15 ft and the Solinst Barologger Gold Model 3001 are utilized at our sites. Level logger +/- .01 ft accuracy-typical, .001% FS resolution; barologger +/- .003 ft accuracy-typical, .002% FS resolution. Barologgers applied to solinst total pressure data are installed at this site or at upstream and/or downstream site locations. ANNUAL ERRORS/GAPS/UPDATES: 2004-2006 - instruments include capacitance waterlevel sensor (from 9/22/2004) providing stream and air\logger temperture, hourly data. Missing data: 1/6/06 to end of 2006. Data processing: rating curve applied,a=13.827 b=4.9566 r^2 = 0.9915, staff-based, minor offset applied to raw data to equate to staff. Data notes: occaisional #NUM! error in data replaced with value at prior hour. Date error, midnight anomaly, corrected. Ice effects possible12/9/2004-12/27/2004, 12/20/2005-1/6/2006, no corrections performed for ice effects. Data accuracy: Variation in PT values compared to staff is +/- 0.02 ft for PT 2007. Discharge measured +/- 20%. Rating curve application for final values using high and low Q rating curves is +/- 20% error. 2007- instruments include capacitance rod. New cap rod in place 2/22/07. Hourly data. Missing data: 7/4/07-11/7/07 not gapfilled, mostly no flow. Data processing: 2007-2008 rating curve applied, low Q a=6.9525 b=3.6209,r^2 0.9215 high Q a=4.7108, b=3.0064, r^2 0 .9907, break at 0.55 ft. staff-based, minor offset applied to raw data to equate to staff. Data notes: after 11/7/07 raw time stamp is 3 minutes after the hour. Effect considered inconsequential. Data accuracy: Variation in PT values compared to staff is +/- 0.02 ft for PT 2007. Discharge measured +/- 20%. Rating curve application for final values using high and low Q rating curves is +/- 20% error. 2008- instruments include capacitance rod and solinst levellogger; capacitance logger to 6/6/08, solinst levellogger from 10/15/08, hourly data. Missing data: 6/6/08-10/15/08 not filled. Data processing: 2007-2008 rating curve applied, low Q a=6.9525 b=3.6209, r^2 0.9215 high Q a=4.7108, b=3.0064, ,r^2 0 .9907, break at 0.55 ft. staff-based, minor offset applied to raw data to equate to staff. Data notes: 2008 caplogger raw time stamp is 3 minutes after the hour to 6/6/08. 2008 solinst raw data is 10 minutes earlier than the half hour time stamp. solinst stage results from instream solinst data minus barologger solinst data. barologger is located at site BG upstream for 2008, logging 21 minutes after c1w logging raw timestamp. Effect of time offset in data as reported is considered inconsequential for this year. Data accuracy: Discharge measured +/- 20%. Rating curve application for final values using high and low Q rating curves is +/- 20% error. 2009- instruments include solinst levellogger only, hourly data. Missing data: none. Data processing: 2009_2010 power rating curve applied to continuous stage data, a=4.9247 b=3.2697. Data notes: hourly data interval. However, data is collected apprx on the half hour (interpolated to values on the hour); Changed to 30 minute data 5/11/09 1900. Data accuracy: Discharge measured +/- 20%. Rating curve application for final values using high and low Q rating curves is +/- 20% error. 2010- instruments include solinst levellogger only, hourly data. Missing data: none noted. Data processing: 2009_2010 power rating curve applied to continuous stage data to 9/1/2010, (whereby change in rc is applied to next wet period) a=4.9247 b=3.2697. updated rc thereafter for Water year 2011, from 9/1/2010: 3 rating curves are applied, power for low Q a=5.7350 b=3.5838, polynomial a=17.073 b= -14.779 c=3.5801 and a linear a=22.005 b=-15.902 for high discharge at stage break 0.65 and 1.15 ft, accordingly. Data accuracy: Discharge measured +/- 20%. Rating curve application for final values using high and low Q rating curves is +/- 20% error. 2011- instruments include solinst levellogger only, hourly data. Missing data: none noted. Data processing: 2009_2010 power rating curve applied to continuous stage data to 10/1/2010, a=4.9247 b=3.2697. updated rc thereafter for Water year 2011, from 10/1/2010: 3 rating curves are applied, power for low Q a=5.7350 b=3.5838, polynomial a=17.073 b= -14.779 c=3.5801 and a linear a=22.005 b=-15.902 for high discharge at stage break 0.65 and 1.15 ft, accordingly. updated rc thereafter for Water year 2012, from 10/1/2011: 3 rating curves are applied, power for low Q a=5.6401 b=3.5883, polynomial a=17.073 b= -14.779 c=3.5801 and a linear a=22.005 b=-15.902 for high discharge at stage break 0.65 and 1.15 ft, accordingly. Data accuracy: Discharge measured +/- 20%. Rating curve application for final values using high and low Q rating curves is +/- 20% error. 2012- instruments include solinst levellogger only, 30 min data, changed to 10 minute data on 7/20/12 1530. Missing data: none. Data processing: 2012 3 rating curves are applied, power for low Q a=5.6401 b=3.5883, polynomial a=17.073 b= -14.779 c=3.5801 and a linear a=22.005 b=-15.902 for high discharge at stage break 0.65 and 1.15 ft, accordingly. Data notes: intermittent streamflow, usually flows Oct - June. The solinst at c1w uses baro values taken at c2e to correct for atmospheric pressure. For wy 2012, baro values are adjusted according dry season barometric pressure at c1w. Data accuracy: Discharge measured +/- 20%. Rating curve application for final values using high and low Q rating curves is +/- 20% error. 2013- instruments include solinst levellogger only, data interval reverted to hourly on 3/27/13. Missing data: 07/09/13-08/06/13; BARO gap 4/3/13 - 4/17/13, 8/31/13 - 9/19/13. USING BARO DATA FROM C2E. baro in lab to 4/17/13, at BG to 5/29 and 8/31/13, at lg 9/1/13 to 10/23/13. DUE TO MOVING BARO LOGGER TO DIFFERENT SITES AND USING DIF SETTINGS, THE DATA HEREIN USES ADJUSTED BARO DATA. Stage offsets are applied as needed to site staff gage. Cumulative rating curve is utilized to calculate discharge. 2014-2018 rating curve applied to solinst data, power for mult=6.9592 exp=4.1933 2017 - Calculated discharge is suspect as high relative to typical peak flow at this site. However, an unusually deep snowpack occurred winter 2016-2017 in the C1W catchment, which includes the TL weather station. Apprx 2/20/2018 suspect freeze affected erroneously high stage reading,corrected. 2019-2021 Note: Fewer site visits than usual were accomplished during this period. Stage validation via site visit for non-stage is absent for 2019 - 2020 and minimal for 2021. 2019-2020 Solinst water level w/ temperature. Water level adjusted via barologger at adjacent c1e. Constant offset since 2019 is + 0.2 ft to water level. This includes solinst-barologger compensation. Rating curve a=6.0253, b=3.8889 R2=0.9509 (Based on gaging to 2019). Additional constant correction applied to stream flow includes equating water levels less than 0.18 ft (particularly summer months)as equal to zero due to interpreted precision error in barometer and water level sensors, as well as matrix potential, negative pressure due at soil sfc. An additional offset is applied to correct for sensor removal/emplacement, 0.3683 ft added fall 2020, 11/7/2020 forward to 3/28/2021 site visit. Possibility exists that this additional offset may result in erroneously high discharge calculation for fall 2020 if the offset is not valid relative to actual sensor position fall 2020 vs spring 2021. Initiation of post dry season streamflow is interpreted as occuring on 11/7/2020, based on stream temperature, water level and pcp data. The last date the stream was site verified as dry in 2021 is 10/21/20. Overall streamflow was significantly less at both c1e and c1w in 2020 compared to 2019. Along with low flow, unusual cessation of spring baseflow prior to spring runoff seemed to occur April 2020. Runoff not verified by site visits water year 2020. Possibility exists that streamflow calculation may be erroneously low due to lack of stage offset verification. 2021 - 2022 Solinst water level w/ temperature. Water level adjusted via barologger at adjacent c1e. Constant offset since 2019 is + 0.2 ft to water level. Updated rating curve applied a=6.1447, b=3.8966 R2=0.9158 (improved with 2021 flowmeter gaging) (the following based on 2022 dilution gaging a=3.8549, b=4.3574 R2=0.9821 is provided for upper c1w) Constant corrections applied to stream flow involved placing water levels less than 0.18 ft (particularly summer months)as equal to zero due to interpreted precision error in barometer relative to water level sensors. Note above sensor offset correction applied fall 2020 to 3/28/2021.