Environmental Project No. 1178 2007 – Evaluation of Pesticide Scenarios for the Registration Procedure – Appendix B Description of Hamburg Scenario

Evaluation of Pesticide Scenarios for the Registration Procedure

Appendix B Description of Hamburg Scenario

1.1 Conceptual Model

The conceptual model given in the FOCUS groundwater scenario for Hamburg describes a 2 m deep sandy soil column containing six different horizons. This sandy media is rather homogeneous and macropore flow is not considered.

1.2 Data

The climate and soil data for the Hamburg scenario are described in "FOCUS groundwater scenarios in the EU review of active substances" - The report of the work of the Groundwater Scenarios Workgroup of FOCUS (FOCUS, 2000). (http://viso.ei.jrc.it/focus/gw/).

1.2.1 Climate

The precipitation and the mean annual temperature are within the range of 601 to 800 mm and 5 to 12.5°C, respectively. More information can be found in Kördel et al. (1989).

Figure 1 and 2 illustrate PELMO´s FOCUS-standard output for the annual water balance in mm separated into evapotranspiration (volatilisation), runoff (surface runoff) and percolation for use of respectively winter and spring cereals. The figures show that for the application of the winter cereals instead of spring cereals will give a larger percolation through the soil, less surface runoff, and less evaporation. The origin of these climate data is not clear and is not to be found in Kördel et al. (1989).

Figure 1. Annual water balance including evapotranspiration, runoff and percolation for the Hamburg scenario when applying winter cereals annually.

Figure 1. Annual water balance including evapotranspiration, runoff and percolation for the Hamburg scenario when applying winter cereals annually.

Figure 2. Annual water balance including evapotranspiration, runoff and percolation for the Hamburg scenario when applying spring cereals annually.

Figure 2. Annual water balance including evapotranspiration, runoff and percolation for the Hamburg scenario when applying spring cereals annually.

1.2.2 Soil

The soil texture and hydraulic properties incorporated in PELMO for the six horizons are described in Table B1 and B2. The Hamburg soil profile has a very low organic matter content below a depth of 60 cm, which could increase the leaching to the groundwater (Boesten, 1991).

Table B1. Soil texture (FOCUS groundwater scenarios in the EU review of active substances)

Horizon	Depth	Classification	pH- H₂O	pH- KCl	Texture			om	oc	Bulk density	Depth Factor
	Cm				<2 mm [%]	2-50 mm [%]	>50 mm [%]	[%]	[%]	[gcm^-3]	[-]
Ap	0-30	Sandy loam	6.4	5.7	7.2	24.5	68.3	2.6	1.5	1.5	1.0
BvI	30-60	Sandy loam	5.6	4.9	6.7	26.3	67	1.7	1	1.6	0.5
BvII	60-75	Sand	5.6	4.9	0.9	2.9	96.2	0.34	0.2	1.56	0.3
Bv/Cv	75-90	Sand	5.7	5.0	0.0	0.2	99.8	0.0	0.0	1.62	0.3
Cv	90-100	Sand	5.5	4.8	0.0	0.0	100	0.0	0.0	1.6	0.3
Cv	100-200	Sand	5.5	4.8	0.0	0.0	100	0.0	0.0	1.6	0.0

Table B2. Soil hydraulic properties, Van Genuchten/Mualem parameters. *AW: Plant available water in the layer.

Depth	q_s	q_s	a	N	M	Water content		K_sat	l	AW^*
						10kPa	1600kPa
	[m³m^-3]	[m³m^-3]	[m^-1]	-	-	[m³m^-3]	[m³m^-3]	[ms^-1]	-	[mm]
0-30	0.3910	0.0360	1.491	1.4680	0.3188	0.292	0.064	23.330	0.500	68.4
30-60	0.3700	0.0300	1.255	1.5650	0.3610	0.277	0.047	31.670	0.500	69.0
60-75	0.3510	0.0290	1.808	1.5980	0.3742	0.229	0.040	28.330	0.500	28.4
75-90	0.3100	0.0150	2.812	1.6060	0.3773	0.163	0.022	28.330	0.500	21.2
90-100	0.3100	0.0150	2.812	1.6060	0.3773	0.163	0.022	28.330	0.500	14.1
100-200	0.3100	0.0150	2.812	1.6060	0.3773	0.163	0.022	28.330	0.500