1. A Prototype for the Continuous and Cost-Effective Measurement of River Discharge

2. Agenda Introduction Theoretical considerations Practical implementation Testing and results Conclusions

3. Introduction

4. Project Context

5. General ways of measuring discharge

6. Manning’s method for discharge measurement

7. Manning’s formula Where: Q – discharge n – Manning’s coefficient of rugosity A – area of the cross section of the river R – hydraulic radius S – free surface slope

8. Implementation System architecture

9. Components choice (1) Nivopress NPK-4110 pressure level sensor

10. Components choice (2) National Instruments Wireless Sensor Network

11. Software application (1) Precomputation phase

12. Software application (2) NI LabVIEW

13. Software application (3) NI LabVIEW

14. Testing and results (1) Testing setup for a sensor wired to the WSN node

15. Testing and results (2) Some values read from the sensors

16. Testing and results (3) Cost considerations ◦ Gateway: ~1600€ ◦ WSN Nodes: 5 x ~400€ ◦ Depth sensors: 5 x ~500€ ◦ Other accessories: ~200€ ----------------- ~ 6300€

17. Testing and Results (4) Setup and installation time ◦ Low (< 1 day)

18. Conclusions Continuous discharge measurement based on slope-area method Low cost Easy to install and mantain Easy to configure remotely