11th International Drainage Symposium August 30-September 2, 2022 Des Moines, Iowa

1. The long-term results of the Agricultural Runoff
Monitoring programme in Latvia
A. Lagzdins, A. Veinbergs, I. Siksnane, L. Grinberga
Dr.sc.ing., Professor
Latvia University of Life Sciences and Technologies
Department of Environmental Engineering and Water Management
e-mail: ainis.lagzdins@llu.lv

2. Agricultural Runoff Monitoring
Programme in Latvia
2
Based on systematic and regular water quality and
quantity monitoring activities this programme aims
to document and assess the current status and long-
term trends of nutrient concentrations and losses in
different spatial and temporal scales

3. The scales of monitoring activities:
3
• Groundwater (20 wells);
• Experimental subsurface drainage plots (1 site
with 16 plots and 5 treatments);
• Subsurface drainage fields (6 sites);
• Small catchments (10 sites);
• Small and medium size rivers (23 sites).

4. Agricultural nonpoint and point source
pollution monitoring sites
4

5. The river scale monitoring sites
5

6. Berze site for agricultural nonpoint source
pollution monitoring
6

7. 7
Berze site – subsurface drainage field and
groundwater monitoring

8. 8
Berze site –
V-notch weir

9. 9
Mellupite site for agricultural nonpoint source
pollution monitoring

10. 10
Mellupite site

11. Flooding in 2017
11

12. Flooding in 2017
12

13. 13
Drought in 2018

14. Results: Discharge and NO3-N concentration
14

15. Results: Discharge and PO4-P concentration
15

16. Groundwater
16

17. Experimental plots – N application rate
17

18. Subsurface drainage field
18

19. Small catchment
19

20. Rivers of Nitrate Vulnerable Zones
20

21. Sub-catchments of the Berze River
21

22. Sub-catchments of the Berze River –
share of agricultural land
22

23. Sub-catchments of the Berze River –
share of forests and natural areas
23

24. The scales of monitoring at the Berze site –
TN and TP concentrations
24
0.5
10.4
8.2
5.4
2.9
0
2
4
6
8
10
12
BG-2 BerzeDr BerzeSc Alave Livberze
TN
concentration,
mg
l
-1
Scale of monitoring
0.019
0.058
0.147
0.073
0.053
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
BG-2 BerzeDr BerzeSc Alave Livberze
TP
concentration,
mg
l
-1
Scale of monitoring

25. The scales of monitoring at the Mellupite site –
TN and TP concentrations
25
0.6
11.3
4.2
7.1
0
2
4
6
8
10
12
MG-3 MC-120 MelipiteDr MelipiteSc
TN
concentration,
mg
l
-1
Scale of monitoring
0.012
0.037
0.065
0.063
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
MG-3 MC-120 MelipiteDr MelipiteSc
TP
concentration,
mg
l
-1
Scale of monitoring

26. Thank you for your attention!
Questions or comments?