LEWAS Blog

LEWAS Blog

Wednesday, April 20, 2016

Wednesday, April 20, 2016 - Stream Observations

General Information
  • Date: Wednesday, April 20, 2016
  • Time: 1:20 PM

Weather Conditions
  • Clear blue skies and sunny with no wind.
  • Ambient temperature was approximately 69 °F.
  • No precipitation observed throughout the day.

Water Quality Observations
  • Stream was very clear with virtually no turbidity.
  • No oil or other contaminants observed.   

Stream Stage
  • Water level was at the 9-cm mark on the measuring stick inside the culvert.  The approximate stage behind the weir was 30 cm (0.98 ft).  

Stream Discharge
  • From the stage observations, the estimated flow rate was 4.2 cfs.

Other Observations
  • Both storm sewer outfalls near the LEWAS station were dry.
  • Trash previously observed near the stream had been collected.  
  • The same duck was back for another visit.  She's become the unofficial mascot of the LEWAS lab.  

LEWAS Data
  • Water temperature readings are continuing to increase over time, likely in response to increasing ambient temperatures.
  • The flow rates shown below are noticeably less than that estimated from the stage reading. Calibration errors between the stage-discharge equation and the digital flow meter might explain the discrepancies.  
  • In general, flow rate readings are decreasing, possibly in response to sustained dry weather, and also evaporation due to rising water temperatures.  
  • Turbidity increased sharply starting at approximately 6 PM on April 19th and continuing until 9 AM on April 20th, after which the measurements returned to normal.     
  • Turbidity readings were very low at the time of inspection, coinciding with visual observations. 


Photographs









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