1. Tevere Pilot River Basin
Common Implementation Strategy for the
Water Framework Directive (2000/60/EC)
Integrated Testing in the Pilot River Basins
Pilot River Basin Workshop
Annual review and research &
technology integration
Ghent 4-5 October 2004
Interaction between the flooding management plan and the WFD management plan in the Tevere River Basin
Manuela Ruisi
Alfredo Di Domenicantonio
Paolo Traversa

2. Tevere Pilot River Basin
Ecoregion 3
Basin surface area ,996 km2
Population inhabitants

3. Tevere River Basin Planning and WFD 2000/60
Water Balance plan (Tevere RB Authority)
Water Protection Plan (Regional plan)
2005
Adopted
Hydrogeological setting plan
2001
Adopted
2005
Approved
In consultation
WFD 2000/60
Management plan
2006
Art. 5
2003
2005

4. Hydrogeological setting plan
KNOWLEDGE SYSTEM
Two activity lines:
Geomorphological risk
Efficiency of the mountain river basins in terms of hydrogeological defence
Slope instability and gravitation movements
Hydraulic risk
Floodable areas in the flood plains

5. Hydrogeological setting plan
SLOPE EFFICIENCY
Analysis carried out on 181 sub-basins (average surface area 100 Km2):
Rainfall analysis
Geological map 1:25.000
Vegetation coverage
map 1:10.000
Slope analysis by DEM
Analysis method CN and USLE
Identification of homogeneous areas
Identification of evolution trends

6. Hydraulic hazard assessment procedure
Hydrological analysis
Rated flows calculated for different return times (50, 100, 200, 500 years)
Topographic survey in sections spaced at
Hydraulic mono-dimensional simulation, in stationary motion (code HEC-RAS ver. 2.0)
Comparison with the digital elevation model
Calculation of the intersection between water surface and topography
Delimitation of
floodable areas

7. Hydraulic risk Survey area 1450 kmq 1800 river sections with
Air cover ALTM - CASI
Survey area 1450 kmq
1800 river sections with
first-order leveling
Leveling (precision DEM h=30cm pass 2x2mt)
Multispectrum images CASI

8. Hydraulic risk
DTM with first-order leveling sections

9. Hydraulic risk
Hydraulic simulation compared with the digital elevation model

10. Hydraulic risk
Flooding areas

11. Hydraulic risk
Land use

12. Hydraulic risk
Town-planning

13. Hydraulic risk
Risk areas (TR = 50)

14. Hydraulic risk

15. Hydraulic risk Urban development in floodable areas
ANTHROPIC DYNAMICS
Loc. Ponte Valle Ceppi
Urban development in floodable areas
Linear infrastructures development in flood plains
1: IGM
1932
Imagine CASI 1998

16. Floodable areas and hydraulic risk in Rome

17. Hydraulic risk
“Ponte Milvio” bridge
December Flood

18. Hydrogeological setting plan
Plan objective
Hydraulic risk reduction in alluvial plains through prevention in mountain areas
Mountain areas
Plan measures:
To slow down the runoff in order to increase the infiltration
Through
Reforestation
Hydraulic-forest works

19. Hydrogeological setting plan
Plan objective
Hydraulic risck reduction in alluvial plains through prevention in mountain areas
Alluvial plain
Plan measures:
Protection of human life and settlements
through
norms that regulate the use of the floodable zones
Defence works
Settlement displacement

20. Interaction Flooding mp - WFD mp
Flooding Plan Measures
Interaction with WFD
Risk factors
Increase of Effective Infiltration
Aquifer recharge
Reforestation
mountain
Hydraulic-forest works
Alteration of the natural
ecosystems
Defence works
Introduction of HMWB’s
Settlement displacement
Removal of HMWB’s
Alluvial plain
Introduction of Fluvial Parks
Aquatic ecosystems and Wetlands

21. Thank you!