Coldwater Spring Water Flow




2014

Date Springhouse GPM Wetland A GPM
January 9th, 2014 40 15
January 15th, 2014 41 16
January 23rd, 2014 43 15
January 31st, 2014 42 14
February 6th, 2014 42 15
February 13th, 2014 41 17
February 20th, 2014 42 17
February 28th, 2014 41 13
March 5th, 2014 42 15
March 12th, 2014 43 15
March 20th, 2014 43 19
March 28th, 2014 44 17
April 4th, 2014 44 18
April 11th, 2014 41 17
April 18th, 2014 44 15
May 2nd, 2014 45 n/a
May 9th, 2014 44 n/a
May 16th, 2014 45 17
May 23rd, 2014 44 17
May 28th, 2014 44 17
June 6th, 2014 48 14
June 13th, 2014 49 14
June 20th, 2014 49 17
June 27th, 2014 49 14
July 3rd, 2014 49 11
July 11th, 2014 51 12
July 18th, 2014 49 11
Jul7 25th, 2014 48 11
August 1st, 2014 42 10
August 8th, 2014 41 10
August 15th, 2014 44 10
August 22th, 2014 46 8
August 29th, 2014 47 10
September 5th, 2014 47 11
September 12th, 2014 43 10
September 19th, 2014 47 12
September 26th, 2014 42 11
October 3rd, 2014 52 15
October 9th, 2014 45 13
October 17th, 2014 47 11
October 24th, 2014 46 14
October 31st, 2014 45 14
November 7th, 2014 48 17
November 14th, 2014 48 12
*GPM = gallons per minute
*04/25/14-05/16/14: Monitoring of Wetland A waterflow was suspended due to the deterioration of the limestone rock from which it was collected.
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2013

Date Springhouse GPM Wetland A GPM
January 2nd, 2013 41 19
January 7th, 2013 42 19
January 15th, 2013 41 19
January 23rd, 2013 41 18
January 29th, 2013 42 19
February 6th, 2013 41 18
February 12th, 2013 41 18
February 21st, 2013 38 15
February 26th, 2013 39 16
March 7th, 2013 38 17
March 12th, 2013 39 15
March 20th, 2013 40 15
March 26th, 2013 40 18
April 2nd, 2013 40 18
April 9th, 2013 36 19
April 16th, 2013 40 17
April 23rd, 2013 40 22
April 30th, 2013 40 18
May 7th, 2013 40 17
May 14th, 2013 40 17
May 20th, 2013 42 18
May 28th, 2013 42 18
June 6th, 2013 40 21
June 11th, 2013 42 18
June 19th, 2013 43 15
June 25th, 2013 43 19
July 2nd, 2013 35 17
July 10th, 2013 44 20
July 16th, 2013 47 21
July 24th, 2013 42 20
July 30th, 2013 41 20
*GPM = gallons per minute
Date Springhouse GPM Wetland A GPM
August 8th, 2013 41 20
August 16th, 2013 44 16
August 23th, 2013 46 16
August 30th, 2013 44 16
September 6th, 2013 42 17
September 17th, 2013 44 19
September 26th, 2013 44 17
October 9th, 2013 41 18
October 17th, 2013 40 19
October 21st, 2013 40 19
October 28th, 2013 40 19
November 8th, 2013 45 18
November 13th, 2013 40 21
November 20th, 2013 42 15
November 21st, 2013 42 17
November 22nd, 2013 39 16
November 23rd, 2013 40 13
November 25th, 2013 43 16
November 26th, 2013 40 17
November 27th, 2013 42 20
November 29th, 2013 41 19
December 2nd, 2013 42 19
December 3rd, 2013 39 19
December 4th, 2013 40 20
December 5th, 2013 40 18
December 6th, 2013 40 17
December 11th, 2013 40
December 13th, 2013 16
December 18th, 2013 42 18
December 24th, 2013 42 16
December 31st, 2013 42 17
*GPM = gallons per minute
*11/20/2013 - 12/06/2013 - Took flow measurements Monday-Saturday due to CenterPoint Energy gas pipeline relocation.

WHY

The NPS monitors the water flow at Coldwater Spring. This provides a baseline of the water flow rate and allows for observations of changes in it. The spring and reservoir are contributing elements to the Fort Snelling National Historic Landmark, and any changes to the flow of the spring represent potential impacts to this landmark.

HOW

The water is collected using the "Bucket Fill" method which uses a bucket and stopwatch. The bucket is placed into the water flow and the time it takes to completely fill the bucket is recorded. This process is repeated 3 times and the results are then averaged.

The NPS explored different water collection techniques, and this method provided the best results. See the analysis here.

WHERE

The water flow is collected at two locations. The first is from a pipe that exits the southwest corner of the springhouse. The second is off a limestone rock in which the wetland south of the springhouse and reservoir drains.



View Coldwater Spring - Flow Collection Locations in a larger map