1. Simulating Pesticides in Urban Runoff Model Development and Evaluation
Ting Tang, Ann van Griensven, Piet Seuntjens, Jan Bronders /05/2017
IWA World Water Congress & Exhibition 2016

2. Pesticides are frequently used/ detected in urban areas/water
Herbicides/insecticides/fungicides/biocides
Various sources
Extreme peak conc.
Load from urban areas ≈ from agricultural areas
How do pesticides behave on HS?
How to quantify the loss from HS?
Lawn
Roadside Pavement Façade
Aim: Develop an urban pesticide runoff model
Spatial properties of urban areas
Hard-surface processes  previous exp. studies

3. A newly developed model for hard-surface pesticide wash-off
Active phase
Pesticide inputs
(Partially) reversible sorbed phase
distribution
Distribution/Degradation/Wash-off/infiltration
Six combinations of methods
Different level of complexity
Model tests using experimental data
Added into WetSpa-Python: a spatially- distributed hydrological model
Wash-off load
wash-off
wash-off
Wash-off load
Runoff
Hard Surfaces
Underling soil
Figure not to scale
Metabolites active phase
(Partially) reversible metabolites sorbed phase
distribution
degradation
degradation
Infiltrated mass

4. Hard-surface wash-off tests using experimental data
Different methods for hard-surface wash-off are suited for different wash-off profiles

5. Simulating Pesticides in Urban Runoff Model Development and Evaluation
Ting Tang1,2,3*, Ann van Griensven2,4, Piet Seuntjens1,3,5, Jan Bronders1
1Flemish Institute for Technological Research, Belgium
2Vrije Universiteit Brussel, Belgium
3University of Antwerp, Belgium
4UNESCO-IHE, Netherlands
5Ghent University, Belgium
*Contact:
Acknowledgement: The work is funded by the Flemish Institute for Technological Research (VITO, grant No ).
IWA World Water Congress & Exhibition 2016