The document discusses the wflow hydrological modeling framework. It provides an overview of wflow, describing it as an open source, distributed hydrological model based on PCRaster and Python. It outlines some of wflow's key strengths like direct links to datasets, inclusion of multiple hydrological concepts, and connections to other packages. The document also summarizes example wflow applications, current developments like the new 2018.1 release, and planned future improvements and research.

1. Hydrological modelling using the
wflow framework
Mark Hegnauer, Deltares
09 November 2018 – 3rd wflow user day

2. Program of the day
21 May, 2018

3. And now
A short “get to know each other” quiz
 Use your mobile phone or laptop
 Go to https://kahoot.it/
 Enter GAME PIN
 Add user name
21 May, 2018

4. About the wflow framework
 The Deltares open source hydrological modelling framework
 Wflow can be used freely
 Key strengths:
 Directly links to available (gridded) datasets
 Multiple hydrological concepts included
 Open Source – easy to work together / share knowledge
 Strongly linked to other packages (e.g. MODFLOW (BMI),
Delft-FEWS (wflow-adapter) and OpenDA (BMI))
 Source code can be downloaded from: https://github.com/openstreams/wflow/
 More information: http://wflow.readthedocs.org/en/latest/
Connectivity via:
 BMI
 NETCDF-CF
 Open standards

5. Usage of the wflow framework
Wflow is used by Universities, Research Institutes, Consultants and
Governments around the world
21 november 2018

6. What is wflow?
A hydrological modelling framework:
 Based on PCRaster / Python framework
 Fully distributed hydrological model
 Different hydrological concepts available
 HBV
 SBM
 FlexTopo (beta)
 W3RA
 PCRGLOB-WB
 Different modules available:
 Routing module
 (Simple) reservoirs module
 Crop growth module (LINTUL)

7. Characteristics of the wflow model
 Gridded output: results can be obtained for any point in the model
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8. Characteristics of the wflow model
 Grid output: multiple variables can be stored and displayed
21 november 2018
Snowpack simulation in Albania Runoff simulation in France

9. Example projects using wflow
 “RWSOS Rivieren” (forecasting Rhine / Meuse
flows into the Netherlands)
 Indonesia (nation wide water availability)
 Sava Flood Forecasting System (forecasting)
 Ganga River Basin Model for strategic basin planning
(IWRM)

10. Wflow product
Wflow development version:
 Python scripts, Python-PCRaster framework, GDAL, …
 Open source, adjust the scripts, get latest updates
 Contribute!
Wflow binaries:
 Pre-compiled, tested (automatic) and ready-to-use
 Periodical release (2018.1 is recently released!)
 Obtaining latest executables, contact: wflow@deltares.nl
 Coming soon: https://oss.deltares.nl/web/wflow
 Note: wflow does not come with a GUI
21 november 2018

11. Release wflow 2018.1

12. Latest developments: Release 2018.1
Main features of the new release:
 Migration to Python3 and PCRaster 4.2.0
 New model concept added: pcrglob-wb
 Improvements of the wflow_sbm model:
 Reduced root water uptake (Feddes)
 Allow soil evaporation from saturated store
 Multiple soil layers (optional)
 Reservoir areas added to simple reservoir
module (P and PET)
 Lake modelling based on HBV-96
 Minor improvements/bug fixes (240 commits in
2018)
 Automatic test & build process setup
21 May, 2018

13. Latest developments: Release 2018.1
Main features of the new release:
 Migration to Python3 and PCRaster 4.2.0
 Python2 no longer supported from 2020 onwards
 Some packages (e.g. pandas) already unsupported
 PCRaster 4.2.0 only supports Python3
21 May, 2018
https://pythonclock.org/

14. Latest developments: Release 2018.1
Main features of the new release:
 Reservoir areas added to simple reservoir module (P and PET)
 Rain and evaporation calculated in reservoir module
 No double counting
21 May, 2018
Rainfall
taken care of
in reservoir
module

15. Current and upcoming developments
Activity Status
 Documentation (incl. tutorials) Ongoing
 Rolling out of a global wflow model Ongoing
 Possible new collaborations (ao VU / NCAR) Ongoing / Open
 Upgrade wflow model builder (“Hydro Earth”) Ongoing
 Connection to emission / WQ model Ongoing
 Improvements to the snow / glacier module Research
 Improved lake / reservoir module Research
 Online coupling to Delft3D FM (detailed) Research
 Improved routing scheme (faster) Idea
 (Online) coupling with water allocation model Idea
 Expand crop growth module with more crops Idea
 Develop a QGIS plugin for wflow Idea
21 May, 2018

16. Activity Status
 Documentation (incl. tutorials) Ongoing
 Rolling out of a global wflow model Ongoing
 Possible new collaborations (ao VU / NCAR) Ongoing / Open
 Upgrade wflow model builder (“Hydro Earth”) Ongoing
 Connection to emission / WQ model Ongoing
 Improvements to the snow / glacier module Research
 Improved lake / reservoir module Research
 Online coupling to Delft3D FM (detailed) Research
 Improved routing scheme (faster) Idea
 (Online) coupling with water allocation model Idea
 Expand crop growth module with more crops Idea
 Develop a QGIS plugin for wflow Idea
Current and upcoming developments
21 May, 2018
Any other ideas / suggestions?

17. More information
Online technical documentation:
 http://wflow.readthedocs.io/en/latest/
GitHub repos:
 https://github.com/openstreams/wflow
More info? Sent an email:
 wflow@deltares.nl
Soon also on Open Source Software portal:
 https://oss.deltares.nl/web/wflow
21 May, 2018