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Raccoon & D.M. River Nitrate: Historical Nuggets

Posted on February 12th, 2017

My detailed data sets for the Raccoon and Des Moines Rivers at Des Moines go back to 1974 and 1982, respectively. Here are some interesting nuggets from that data:

 

Largest Nitrate-N Loading Years
Raccoon Des Moines
year N Load (kg) Year N Load (kg)
2015 47,456,365 1991 68,891,857
1993 36,559,570 2016 65,197,500
1991 35,032,826 1993 65,193,560
2016 33,442,173 2015 50,554,633
2010 31,752,718 1984 48,170,390
2007 31,445,480 1999 47,259,680
1999 30,326,304 2010 45,514,501
1984 30,241,192 2007 44,537,829
1983 29,720,481 1992 43,067,226
1998 27,109,932 1983 42,305,864

 

Smallest Nitrate-N Loading Years
Raccoon Des Moines
year N Load (kg) Year N Load (kg)
1977 256,146 1989 852,083
2000 1,099,153 1988 4,014,574
1981 1,136,409 2000 5,073,673
1989 1,514,568 2012 5,086,696
2012 2,332,742 1987 12,498,792
1988 3,273,469 2002 13,307,778
1985 4,721,665 1990 13,442,047
1976 5,423,966 1985 14,218,439
1980 6,093,000 1996 18,212,045
1994 6,814,386 1997 18,490,627

 

Largest Average Nitrate-N Concentration Years
Raccoon Des Moines
year N Conc (mg/L) Year N Conc (mg/L)
2015 11.72 2015 9.89
2002 9.87 2016 9.64
1979 9.72 1992 8.89
1992 9.26 1991 8.70
2007 9.13 2007 7.89
2016 9.07 2006 7.70
1991 8.54 2002 7.51
1978 8.48 2005 7.42
2006 8.17 1999 7.24
1998 7.76 1995 7.09

 

Smallest Average Nitrate-N Concentration Years
Raccoon Des Moines
year N Conc (mg/L) Year N Conc (mg/L)
1977 0.58 1989 1.46
2012 2.34 2012 2.42
1981 2.52 1988 3.29
2000 2.89 2000 3.31
1976 2.98 1997 4.66
1989 2.98 2011 4.67
1975 3.68 2013 4.97
1988 4.56 1994 5.17
1974 4.72 2008 5.26
1985 4.75 2009 5.39

 

Largest Nitrate-N Load Months
Raccoon Des Moines
year N Load (kg) Year N Load (kg)
Jun-13 12,398,580 Jun-91 18,978,427
Jun-15 10,435,396 May-91 18,326,453
May-13 9,426,514 Jul-93 18,290,586
Jun-08 9,103,654 Jun-13 15,158,386
May-91 8,768,826 May-99 13,097,714
May-16 8,740,426 Jun-01 12,269,743
May-07 8,726,000 May-16 12,132,889
Apr-99 8,663,559 May-13 11,401,836
Jul-93 8,516,596 Jun-99 11,219,770
Dec-15 8,486,714 Jun-08 11,181,267

 

Smallest Nitrate-N Load Months
Raccoon Des Moines
year N Load (kg) Year N Load (kg)
Jun-77 357 Dec-89 5189
Jul-77 386 Feb-13 6735
May-77 680 Jan-89 8016
Sep-12 829 Nov-89 8673
Oct-12 1168 Jan-13 12,364
Aug-12 1417 Oct-89 12,578
Oct-76 1648 Jan-12 13,351
Sep-05 2293 Dec-13 14,936
Oct-05 2423 Dec-12 14,991
Oct-03 2424 Feb-89 15,205

 

Days with Highest Nitrate-N Concentration
Raccoon Des Moines
year N (mg/L) Year N (mg/L)
5/8/2013 24.4 5/17/2013 18.6
11/15/1979 22.0 5/10/2013 18.5
5/7/2013 21.9 5/16/2013 18.4
5/13/2013 21.4 5/11/2013 18.4
5/14/2013 21.4 5/15/2013 18.3
6/14/2013 21.2 5/13/2013 18.2
5/15/2013 21.1 5/14/2013 18.0
5/26/2013 21.1 5/9/2013 17.9
5/12/2013 21.0 5/18/2013 17.7
11/27/1979 21.0 5/12/2013 17.6

 

Days with Largest Nitrate-N Load
Raccoon Des Moines
year N Load (kg) Year N Load (kg)
6/15/2013 891,628 6/10/1991 837,946
5/28/2013 831,469 6/11/1991 798,649
6/15/2015 766,411 6/16/1991 753,432
6/25/2015 751,348 6/17/1991 746,810
6/1/2013 690,639 6/18/1991 736,640
6/16/2013 681,671 6/9/1991 734,977
5/31/2013 681,367 6/12/1991 720,287
6/2/2013 670,633 6/20/1991 700,066
5/29/2013 644,484 6/13/1991 699,853
6/3/2013 641,876 6/19/1991 693,082

These next two graphs show the average nitrate-N concentration and load with calendar day (DOY-day of year) over the period of record for each river.

 

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