The document outlines the objectives of a river system modeling project in the Ganga River basin, which aims to enhance basin planning capabilities through evidence-based strategic assessment. It discusses the use of the IMOD software for groundwater-surface water interaction modeling and stakeholder engagement to improve river health while maintaining economic productivity. The project timeline includes model setup, data validation, and scenario development with completion expected by December 2017.

1. iMOD in India Ganga Basin
iMOD User Day - Delft Software Days 2016
Roelof Stuurman
(Frans Roelofsen, this week in Delhi: frans.roelofsen@deltares.nl)

4. The main focus is the river system. The groundwater
study is supporting the river assessment

6. High level objectives (TOR WorldBank)
To significantly strengthen the capability of relevant central and state
government agencies to undertake comprehensive evidence-based
strategic basin planning for the Ganga River basin
To develop, document and disseminate (through detailed analytical work
and stakeholder engagement) a set of plausible scenarios that
balance significantly improving the health of the river and
maintaining an acceptable level of economic productivity, and
To build stronger and more accessible information and knowledge
base to guide ongoing dialogue around and management of the
Ganga River basin
To establish ongoing multi-stakeholder engagement processes in
the basin to support strategic basin planning
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7. 7 november 2016

8. Set-up of the River Basin Model
WFlow
hydrology
routing
iMOD
ground water
pollutants
database
DWAQ:
water
quality
GANGA Dashboard
SPHY
mountain
hydrology
RIBASIM:
water
resources
ecological
knowledge
rules
GANGA WIS

9. 7 november 2016
Global scale
water
demand
model
(10x10 km grid)
Conceptual
model
Stakeholder
participation,
training
iMOD
groundwater
model

10. Complex groundwater surface water interaction
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11. Types of groundwater – surface water interaction
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1. Continuous draining river,
3. Continuous Infiltrating river
(hydrological connection)
5. Continuous infiltration, (surface
water and groundwater
disconnected)
2. Periodically changing from
drainage into infiltration,
4. Through flow situation

12. iMOD model set-up

13. Project Advantages of iMOD:
• iMOD is open source and free
• Fast, flexible and consistent sub-domain modeling techniques.
• Can handle very large, high resolution models. Ganga basin > 3 million
grid cells
• Geo-editing of the subsurface
• Easy to use Graphical User Interface
• Powerful 2d/3d data visualization (also long time series)
• Easy model linking with other Deltares software for hydrology and water
resources ( e.g. WFlow/D-Hydrology and Ribasim)
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14. Infiltration / drainage Maps
What will be the results
Conceptual model

15. What will be the results
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Ground water model
Data sharing
Infiltration / drainage Maps
Conceptual model
Map of Groundwater Management Unit

16. iMOD initial model results

17. GW quantity –SW/GW interaction
?
?
?
? Flow direction unknown
Loosing river
River

18. 7 November, 2016
3 day iMOD training in Delhi an Kolkatta
40 participants at 2 courses of each 3 days

19. 7 November, 2016
Number of iMOD downloads in India
INDIA:
Largest number
of downloads
outside The
Netherlands,
30 downloads

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21. Status of the project
• Present (November 2016)
> Still some requests for data (geohydrology)
> Validating and processing data for mode input
> Linking iMOD with Wflow and Ribasim (set up tools to exchange water
fluxes / waterlevels)
• Near Future
> (ground)water models ready: March 2017
> Defining and calculating scenarios / measures: March - September 2017
> Project ready: December 2017
• Far Future
> On-going update and use of models by national/state governments and
consultants
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22. 7 november 2016