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 Bogus Gage, aka Bogus South Gage (BG,BGS,BSG) stream measurement site of Dry Creek Experimental Watershed, Boise, Idaho. DATA STREAM: 1. A flume was installed at this Dry Creek headwater catchment outlet by Boise State University, late 2011. Prior to this installation measurement has been conducted periodically since 2002. Instruments installed vary year to year and may include a conductivity-temperature sensor, water level pressure transducer and/or additional instruments for measuring water level. Data collected prior to flume installation is available by request. Data collection and site maintenance 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. 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). At this headwaterlocation, for which the contributing area is approximately 0.5 km2, the channel is less than a meter wide and set within a small floodplain, approximately 200 m wide. Instrumentation at this site is installed within the flume stilling well. Prior to flume installation sensors were installed at stream channel bottom within stilling wells. 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 and dilution 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. Capacitance loggers used since 2007 at our stream sites have been purchased from Odyssey, also based in New Zealand. These sensors provide waterlevel data only, resolution 0.001 ft. Pressure transducer - 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. New Campbell Scientific CS450 SDI-12 pressure transducer installed fall 2012. CS450 Temp accuracy +/-0.2C, stage resolution is 0.0035%FS ±0.1% FS TEB (Includes the combined errors due to nonlinearity, hysteresis, nonrepeatability, and thermal effects over the compensated temperature range, per ISA S51.1.) Conductivity-Temperature sensor - Campbell Scientific conductivity sensors employed at our sites include CS547A probes which require the Campbell A547 datalogger interface device. Older 247 models were employed prior to 2004. Data resolution is assessed as 0.001 ms/cm. FLUME INSTALLATION AND RATING CURVES: Flume installation complete fall 2012 with new Odyssey capacitance logger valid after 6/6/12 and Campbell Scientific pressure transducer online fall 2012. Both sensors are installed within flume stilling well. The capacitance logger exhibits higher noise than the pt and has a low measurement limit at apprx 0.2 ft stage (does not measure water depth below 0.2 ft). Conductivity-temperature sensor is placed at flume outlet. Stream temp is provided by condT probe due to its location in main streamflow. A multi-step rating curve is applied for discharge at the flume. The stage-discharge data table provided with the flume has been verfied with on-site stage-discharge measurements (stage 0.1 ft to 0.7 ft). Both power and polynomial equations have been applied to the stage-discharge data. Polynomial fit is best for high stage data over 1.6 ft (rare at this site) discharge y, stage x y = 115.02x^2 -66.723x +16.963 r2 = 0.9993 for stage 0.17 to 1.6 ft y=89.813x^2 -17.46x +3.0897 for stage less than 0.17 y=78x^1.8863 ALTERNATELY, the rating curve based on site measurement for stage less than 1 ft is y=64.903x^2 +7.5831x -0.462 r2 = 0.9955 ANNUAL ERRORS/GAPS/UPDATES: 2002-2006- Varied instruments installed including capacitance loggers, pressure transducers, solinstlevellogger and EC-T sensors. Discharge data avail from 11/01/2002 upon request, (gap 11/11-11/30/2002. Gaps 1/29-2/1 2003, 2/20/2003 1300; Stage adjusted 6/3/2003-6/13/2003 to address apparent sensor drift, data for this period is considered to be modeled data. Rating curve used water year 2002-2003 a=3.5539 b=3.3215 with a +0.04ft offset to raw PT stage data to 10/1/2003. With offset, stage data corresponds to staff values, discharge also corresponds well with discharged measured on site. No offset was applied 10/1/2003-June 2004, same rating curve. Gap 11/8/2003, 6/1-6/8/2004. 7/7, 8/11/2004. PT failure 3/19-5/24/2004. Stage data to 6/1 is suspect, followed by gap to 6/8/2004. Therefore, spring runoff is not captured 2004.) T, ec avail from 11/30/2002. ec values 12/14-12/26/2002 indicate frozen or out of water conditions. Equipment stolen Oct 2004. 2006-2009- New installation March 2006. Solinst levellogger provides water level and stream temperature approx 100 m downstream of the subsequently installed 2011 flume installation site. Conductivity data is not collected. 2006 data gap 7/15-11/19/2006. Minor data interval time offsets occur: 2006 - actual timestamp as of 11/19/2006 1500 is 36 minutes after the hour; 2007 - actual timestamp changes to one minute before the hour as of 3/11/07 1500; 2008 - actual timestamp changed to 14 minutes before the hour as of 1/18/08 1700. Timestamp was originally offset as 7 minutes after the hour and half hour as of 5/11/09 1900 for the 30 min data interval. Paired barologger lost 2009, assumed to be lost downstream during peak flow conditions, 2009. Barometric pressure following this loss is determined from barometric pressure measured at downstream sites and adjusted for elevation, for which the result is questionable. 2010- Solinst levellogger provides water level and stream temperature approx 100 m downstream of the 2011 flume installation site. Barometric pressure is determined from barometric pressure measured at downstream sites and adjusted for elevation, for which the result is questionable. Timestamp was originally offset as 7 minutes after the hour and half hour as of 5/11/09 1900 for the 30 min data interval. 2011- Solinst levellogger provides water level and stream temperature approx 100 m downstream of the 2011 flume installation site. Barometric pressure is determined from barometric pressure measured at downstream sites and adjusted for elevation, for which the result is questionable. Timestamp was originally offset as 7 minutes after the hour and half hour as of 5/11/09 1900 for the 30 min data interval. 2012- Solinst levellogger provides water level and stream temperature approx 100 m downstream of the 2011 flume installation site. Barometric pressure is determined from barometric pressure measured at downstream sites and adjusted for elevation, for which the result is questionable. Nonetheless, 2012 solinst-provided continuous discharge is verified as correct according to 5 site visits and is used for published 2012 discharge data at this site. Timestamp was originally offset as 7 minutes after the hour and half hour for the 30 minute data interval UNTIL 6/6/12. Rating curve for 2012 includes power equations for low flow at <0.8 ft stage a=1.7594 b=3.5008 and high stage rc a=2.0124 b=4.0116 output cfs. Flume location New Campbell Scientific CS450 SDI-12 pressure transducer installed fall 2012. CS450 Temp accuracy +/-0.2C, stage resolution is 0.0035%FS ±0.1% FS TEB (Includes the combined errors due to nonlinearity, hysteresis, nonrepeatability, and thermal effects over the compensated temperature range, per ISA S51.1.) FLUME INSTALLATION AND RATING CURVES: Flume installation complete fall 2012 with new Odyssey capacitance logger valid after 6/6/12 and Campbell Scientific pressure transducer online fall 2012. Both sensors are installed within flume stilling well. The capacitance logger exhibits higher noise than the pt and has a low measurement limit at apprx 0.2 ft stage (does not measure water depth below 0.2 ft). Conductivity-temperature sensor is placed at flume outlet. Stream temp is provided by condT probe due to its location in main streamflow. A multi-step rating curve is applied for discharge at the flume. The stage-discharge data table provided with the flume has been verfied with on-site stage-discharge measurements (stage 0.1 ft to 0.7 ft). Both power and polynomial equations have been applied to the stage-discharge data. Polynomial fit is best for high stage data over 1.6 ft (rare at this site) discharge y, stage x y = 115.02x^2 -66.723x +16.963 r2 = 0.9993 for stage 0.17 to 1.6 ft y=89.813x^2 -17.46x +3.0897 for stage less than 0.17 y=78x^1.8863 ALTERNATELY, the rating curve based on site measurement for stage less than 1 ft is y=64.903x^2 +7.5831x -0.462 r2 = 0.9955 2013- Solinst levellogger remains in place, providing continuous data. Flume is operational with new Odyssey capacitance logger, Campbell Scientific pressure transducer and conductivity-temperature sensors. Both water level sensors, the pressure transducer and the capacitance logger, are used to provide continuous stage data at the flume. Results for capacitance logger and pressure transducer are similar. However, capacitance logger only provides discharge over 2.8 L/s during summer months due to offset at base of capacitance logger limiting low stage measurement. In contranst, the pressure transducer measurement point is situated at the base of the stilling well and measures low summertime flow effectively. Therefore, pressure transducer continuous stage data is primarily used for this published data set. A gap occurs in the pressure transducer data due to memory shortage on module 11/28/12 - 2/8/13. This gap is filled with capacitance logger data for discharge and filled by solinst data for stream temperature. Otherwise, pressure trandsducer data is used for this published data set. Sand accumulation occurs in the flume, nonetheless, the rating curve is verified as stable. Periodic drift in the pressure transducer stage is corrected based on site visits, with the data series corrected accordingly. 2014- All sensors remain in place as described for 2014. However, the solinst sensor is removed 9/26/2014. The pressure transducer water level data drifts upward in value during peak flow, thus is considered inadequate therein. THEREFORE, cap logger data is used during periods of high flow 2014. When flow is below the lower limit for caplogger, PT data is used with offsets carefully monitored and applied. Offsets determined for low flow and throughout the year are determined by site visits to align final water level data to flume stage values. Offset was found to be stable 9/26/14-1/14/15. Stream temp is provided by condT probe due to its location in main stremflow. 2015 - Similar to 2014. PT data is used prior to Jan 8, 2015 and after June 13, 2015. Jan 8 0300 - June 13 0800 data is provided by capacitance logger. Noise is not removed from the data. Gaps occur after 11/29 due to low battery. Stream temp is provided by condT probe due to its location in main stremflow. Note, rain on snow early 2015 resulted in early peak stream flow. 2016- Spring runoff PT measured stage values show erratic behavior 4/28-5/25, low battery. Co-located capacitance logger does not display this erratic fluctuation, instead displays a gradual recession from 4/23 to 5/25, with a diurnal signal, e.g. daily snowmelt. Therefore caplogger data is used for this period. Sporadic gaps occur after 12/14 due to low battery. 2017 - Year begins with numerous Campbell logger data gaps and continues through the year due to low battery issues w/ inadequate solar charge. Added sonar water sensor provides power draw, as well as radio draw. The capacitance logger values are used 1/1/17 to 5/1/17. Ice effects occur in Jan. Cap logger data gap occurs 5/1 to 8/26/17. Comparison of the pt data with capacitance stage data indicates that interpolation through the numerous minor time gaps in the pt data would provide a reasonable approach to creating a continuous data-value gapfilled discharge data set. SDI pt stage values were gapfilled via matlab to nodata values. Existing stage values were offset with -0.323 ft applied to align stage data with onsite staff gage reading. Discharge was calculated via the adjusted stage values as noted above. 2018 - Data provided for 2018 is from cap logger to 6/6/2018 (logger failed) and thereafter avail from pressure transducer water level via Campbell logger. The Campbell logger incurs numerous gaps due to low power with a large data gap 9/19/2018 to 12/20/2018. Caplogger sn41289. applied eqn 0.0491*mv - 48.2360 cm. Then converted to ft, add offset -0.14 ft. PT offset -0.286 ft. 2019 - Higher stream flow recorded this year vs. immediate pre and post years. Site maintenance by students Daniel Murray and Dominic Shulze. Site improvements initiated to solve power and telemetry problems. The Campbell logger provides data to 11/23/2019 (to 11/10/19 for water level), with sporadic data gaps due to low solar charging (nearly 60 days total gap). The applied offset for campbell logger PT water level to stage is -0.286 ft. In addition to above power gaps, this pressure transducer incurs sporadic disconnect. The capacitance water level logger provides water level data from 11/10/2019. Caplogger sn13153. applied eqn 0.0724*mv - 75.4140 cm. Caplogger offset applied is +0.05 ft. Stream temperature data is provided by a hobo in-stream logger. 2020 - Campbell logger water level verified as disconnected to 4/17/2020, logger program not running until 9/15/20. Capacitance water level gap occurs 4/17/20 - 7/16/20. Therefore, stream water level and temperature data is provided by the hobo in-stream logger (paired with a hobo barometric logger). The 2019 - 2020 Hobo water level data output is absolute pressure psi, converted to water level psi, then converted to ft. Hobo water level offset applied is -0.01 ft. From 9/15/20, conductivity data is provided by the campbell logger. Supplemental conductivity data is available a hobo cond sensor from 9/15/2020. 2021 - Campbell sensors provide data for 2021, including pressure transducer for water level. Offset for PT 10/01/2020 through 2021 is -0.3 ft. Last data fetch is 9/15/2020 for supplemental sensors. Thereafter, all, except the hobo cond logger, are found with battery power too low for download at the end of 2021. 2022 - Campbell logger PT water level data is anomalously high early 2022. This early water level as recorded is much higher than 2021 water level. Unfortunately the supplemental sensors are presently unavailable to verify this anomalous flow.