Presentation by Marta Faneca Sanchez and Sandra Galvis Rodriquez (Deltares) at the iMOD International User Day 2018, during Delft Software Days - Edition 2018. Tuesday 13 November 2018, Delft.

1. Multiscale groundwater modelling with iMOD
in Valle del Cauca, Colombia
Sandra Galvis, Marta Faneca, Joost Delsman
Deltares, The Netherlands
20181013

2. 1. Valle del Cauca

5. 1. Valle del Cauca

6. 2. Water authorities in Valle
Regional environmental authority
• Water management for the Valley
• Partner in ESCACES 1, 2 and 3
• Partner in Aquifer Management
Plan Cali (PMAA)
Environmental Authority for Cali
• Water management for the city
• Partner in Aquifer Management
Plan Cali (PMAA)
ESCACES 1
ESCACES 2
ESCACES 3
PMAA
Cali

7. 3. Regional - ESCACES 1 and 2

8. 3. Regional - ESCACES 1 and 2
A
A’
B B’
A A’
B B’

9. 3. Regional - ESCACES 1 and 2
Numerical model  3 layers (100m x 100m)Conceptual model  4 layers

10. 3. Regional - ESCACES 1 and 2
Recharge
• Estimated at the daily scale
• 250 m x 250 m cells (2000 – 2015)
• update in progress
• Inputs
• Land use
• Root depth
• Soil type and texture
• Groundwater depth
• Precipitation and evaporation
interpolated maps (daily)
• Runoff and infiltration
• Recharge is estimated based on the soil
column water balance including irrigation
Average 2000-2009
300 - 600 mm/yr

11. 3. Regional - ESCACES 1 and 2
Hydraulic properties

12. 3. Regional - ESCACES 1 and 2
Pumping wells
440 Mm3/yr

13. 3. Regional - ESCACES 1 and 2
Pumping wells

14. 3. Regional - ESCACES 1 and 2
Model calibration

15. 3. Regional - ESCACES 1 and 2
Modelled groundwater heads

16. 4. Urban - PMAA Cali

17. 4. Urban - PMAA Cali: Conceptual model
DBA + DBC = 11 Mm3
RD = 50 – 100 mm/yr  15 Mm3

18. 4. Urban - PMAA Cali: Vertical discretization
3 m
7 m
15 m
A1
A2

19. 4. Urban - PMAA Cali: Additional data - Geology
Additional information available:
• Lithological columns
• Cross sections with contact between
rocks and sedimentary basin (based on
VES).

20. 4. Urban - PMAA Cali – updated bedrock
ESCACES
PMAA DAGMA

21. Alluvial fan (upper) R. Cali Alluvial fan (lower) de R. Cali Alluvial plain R. Cauca
Río Cauca
Unidad A – 60m
Unidad B – 50m
Unidad C – 300 m
A
A A’
A’
Unidad B – 12m
4. Urban - PMAA Cali – updated Unidad B

22. Urban - PMAA Cali – in progress Recharge

23. Urban - PMAA Cali – in progress
Other updates, changes in the urban model
• Hydraulic properties – new data,
finer layers
• Rivers: New gauge stations
• Rivers: Changes in river bed - conductance
• Recharge/drainage from pipes…
• Lateral recharge

24. Conclusions
General conclusion
1. Multi scale modelling was possible with iMOD features
2. Having a validated regional model allows to underpin other important
local process that would be mask otherwise. This improves the local
model
3. New insights in the data and the model results make us re-think some
of the initial decisions
4. Benefits in two directions – regional and local
Regional models
1. The regional models represent the general conditions and flows of the
groundwater system
2. The tools developed can support the daily, short-term, and long-term
groundwater management
3. It is necessary to establish and maintain a consistent monitoring
network with frequent measurements to follow the dynamics of the
system and validate the models

25. Conclusions
Local urban model
1. Change in scale
• Geology – detailed mapping of alluvial fans, transition zone,
lateral recharge?
• Diffuse recharge
2. Additional urban processes need to be included
• Recharge/drainage from pipes
• Infiltration galleries
• Canalization of river (river-aquifer interaction)
3. Contamination vulnerability of upper aquifer – service stations, etc

26. Questions?
sandra.galvisrodriguez@deltares.nl