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2012 ND Water Quality Council Conference
Bismarck, ND February 28, 2012
Use controlled drainage to reduce
chemical loads
Xinhua Jia, Ph.D.
Agricultural and Biosystems Engineering
North Dakota State University, Fargo, ND
Introduction
Subsurface drainage (SD) has become popular and
necessary in the Red River Valley due to wet weather
conditions, rising water table, and increased soil salinity.
Controlled drainage (CD) uses weirs or structures to
manage the water level in the field so that it is drained
only when it is necessary.
(Sando et al., 2006)
Experimental Site:
Fairmount
Richland County
North Dakota
Subsurface Drainage
44
45
46
47
48
49
50
51
52
0 500 1000 1500 2000 2500
Elev
atio
n (
ft)
Distance from the west to the east side of the field (ft)
Elevation
Tile location
Controlled Drainage
44
45
46
47
48
49
50
51
52
0 500 1000 1500 2000 2500
Elev
atio
n (
ft)
Distance from the west to the east side of the field (ft)
Elevation
Tile location
Controlled
Drainage Subirrigation
To South
To West
Sump and Subirrigation Pumps
Drainage Outflow
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
3/8 4/8 5/8 6/8 7/8 8/8 9/8 10/8 11/8 12/8
Dra
inag
e O
utl
fow
(m
m/d
ay)
2008 (5.7 in)
2009 (5.7 in)
2010 (5.8 in)
PO4-P concentrations at the outlet
0.02 mg/L
NOx-N concentrations at the outlet
1 mg/L
TN concentrations at the outlet
Total Dissolved Solids (TDS) concentrations
at the outlet
SO4 concentrations at the outlet
Cation-Anion Balance at the Outlet in 2009
-5
0
5
10
15
20
0
10
20
30
40
50
60
70
80
90
5/27 6/10 6/24 7/8 7/22 8/5 8/19 9/2 9/16 9/30 10/14
Diffe
ren
ce (%
) Ion
s (m
eq
/L)
Total Cations Total Anions % Dif
Anion-Cation Balance in 2009
0
10
20
30
40
50
60
70
80
6/9/2009 10/8/2009
Me
q/L
Ca
K
Mg
Na
0
10
20
30
40
50
60
70
80
6/9/2009 10/8/2009
NO3
SO4
HCO3
Cl
NOx-N, TN, and PO4-P loads to the streams
TDS and SO4 loads to the stream
Reduction in chemical loads due to
controlled drainage
From June 16 to 27, 2008 10 days
403,998 gal of drainage outflow
PO4-P SO4 NO3-N TN TDS
Reduction (lb/ac) 0.00 337 1.26 1.34 331
Total reduction (lb) 0.07 16,836 63 67 16,559
Summary
Using controlled drainage can reduce chemical
loads to the surface water system
High SO4 and TDS loads were released to the
surface water
Control drainage for 10 days in spring 2008 could
reduce 16,836 lb of SO4, and 16,559 lb of TDS into the
streams for 50 ac field
Best cooperator in Richland County, ND
North Dakota Department of Health
North Dakota State Water Commission
USDA NRCS and USDA CSREES
North Dakota Water Resources Institute
North Dakota Agricultural Experiment Station
Xiaodong Zhang, Thomas Scherer, Dean Steele,
Thomas DeSutter, Zhulu Lin, Roxanne Johnson
Don Lin, James Moos, Kevin Horsager, Jana Daeuber
Ishara Rijal, Xiao Pang, Kate Overmoe, Kelsey Kolars
Acknowledgements