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ICE EFFECTS ON STREAMFLOW

The formation of ice on rivers can cause discharge values to appear unusually high. Display of these erroneous discharge data may result in improper assessment of flow conditions and misuse of the data. For this reason, display of discharge values for streams significantly affected by ice may be disabled from view. Display of discharge data will resume when ice conditions are no longer present. Discharge values for streams minimally affected by ice will continue to be displayed. Flows for streams with these conditions appear to increase during the night and decrease to near-base-line conditions around midday. To estimate the correct discharge for these streams, use the flow rate that corresponds to the bottom of the discharge curve, rather than the peak that corresponds to the top of the curve. Note that this method of estimation is possible only when no surface runoff is occurring. Daily mean discharges for periods of both significant and minimal ice-effect will be estimated and published in the Annual Water-Data Report for the water year in which they occurred.


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USGS 01100568 SHAWSHEEN RIVER AT HANSCOM FIELD NEAR BEDFORD, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 42°28’01”, long 71°16’22”, Middlesex County, Hydrologic Unit 01070002, on left bank, 300 ft downstream from FAA hangar at Hanscom Field and 1.6 mi south of Bedford.
DRAINAGE AREA--2.13 mi2.
PERIOD OF RECORD--Discharge: October 1995 to current year.
Precipitation: October 1996 through September 1999, October 2002 to September 2004.
Water quality: water years 1995-2001.
GAGE--Data Collection Platform with telephone telemeter. Datum of gage is 114.19 ft above NAVD 1988, estimated from topographic map. Datum previously reported as 115 ft above NGVD 1929, estimated from topographic map.
REMARKS-- Discharge values are highly provisional and will change significantly after thorough check and review of data. Gage-height values are accurate. Precipitation gage re-established on site February 2013.
COOPERATION BY--U. S. Air Force


The precipitation data for this station are temporary and will only be displayed for 120 days. Time series of 15-minute or cumulative daily values WILL NOT be available for retrieval following the 120-display period. Although the instrumentation is calibrated at least once/year, the temporary classification means that documented routine inspections and other quality assurance measures are not performed that would make the data acceptable for archival, retrieval, or future use in general scientific or interpretive studies.
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This station managed by the Northborough MA Field Office.

Available Parameters Available Period
  
2020-05-29  2020-09-26
1995-10-01  2020-09-26
2007-10-01  2020-09-26







 (7)
 

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Summary of all available data for this site
Instantaneous-data availability statement


Precipitation, total, inches

Most recent instantaneous value: 0.00 09-26-2020   04:15 EDT
Graph of  Precipitation, total, inches

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Discharge, cubic feet per second

Most recent instantaneous value: 0.87 09-26-2020   04:15 EDT
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Daily discharge, cubic feet per second -- statistics for Sep 26 based on 24 water years of record more
Min
(2005)
Most Recent
Instantaneous
Value Sep 26
25th
percen-
tile
Median Mean 75th
percen-
tile
Max
(2008)
0.21 0.87 1 1.6 3.3 3.4 19.5


Gage height, feet

Most recent instantaneous value: 0.67 09-26-2020   04:15 EDT
Graph of  Gage height, feet

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