FLORISPRE Steering Committee 7th

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FLORISPRE Steering Committee 7th 8th June
2006Guildbourne House, Worthing, UK
Master Plan - Piano Assetto idrogeologico (PAI)
Flood risk and Landslide risk Management
Municipality of Piacenza Sergio Bellocchio -
Europe OfficeLorenzo Bersani - Ambient
Officeprogettoeuropa_at_comune.piacenza.it
Regione Emilia Romagna - Italia
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Introduction

• The Municipality of Piacenza is honoured to take
  part in the project FLORISPRE Prevention of
  Floods Risk, supported by the European Union and
  by Emilia Romagna Region.
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• We intend to actively collaborate with our
  partners Empresa de Gestion Medio Ambiental SA
  from Andalusia Region (Spain) and South East
  Region of England where the present start-up
  meeting is taking place.
• The territory of Piacenza occupies the most
  northern area of the Emilia Romagna Region and it
  is crossed by the Po river and some of its
  tributaries Trebbia, Tidone, Nure, Arda. These
  originate in the Appenines, the most important
  Italian mountain chain after the Alps.
• In Roman times, Piacenza had a river harbour,
  connected to the city through the Fodesta channel
  (fossa Augusta), as we gather from reliable
  historical sources.
• We are told that Saint Savino, who lived between
  the fourth and the fifth century AD, had stopped
  the rivers overflow from flooding the city
  (source a document of Pope Gregory the Great).
• The eighth-century historian Paul the Deacon
  refers to big spates in the north of Italy and a
  big flood in Piacenza with the overflowing of the
  river Po in 590 after Christ.
• In an act of donation from 744 AD, Prando donated
  some real estates to the Cathedral, and it shows
  that river Po had changed his course just as a
  result of alluvium and big floods.

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• Even in 1200 AD, the local historian Nicolli,
  had narrated that Trebbiola river overflowed once
  again and put the city in danger, so that it was
  decided to divert its course towards the external
  zone of Galleana.
• Over the last 100 years, there were a lot of
  floods in Piacenza, the most harmful were in
  1920, 1951, 1999 and 2000.
• The area of Piacenza, for its particular
  orography, is vulnerable to flood risks, that is
  why it is our concern to tackle this issue in
  order to compare the types of prevention,
  intervention and emergency procedures and to
  identify best practices, which could be offered
  by the European riverside countries, to be able
  to face the floods emergencies with greater
  awareness to minimize the damaging effects.

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For a detailed analysis of risk the areas
concerned by floods phenomena the parameters and
definitions adopted by the Basin Authority on the
Po river (subdivision in areas with very high,
average and moderate hazards).The location of
the above-mentioned zones has been included
within PTCP (the District Plan of Provincial
Coordination) approved in July 2000 and though
slowly within the PRG (General Urban Regulation
Plan) of various municipalities, bringing about
important limitations, on the basis of
dangerousness, built-up areas and ground
exploitation, and also defining direct provisions
for the urban and territorial planning.The
watercourses protection bands have been drawn up
for all the main watercourses of the river basin,
thereto its corresponding ground exploitations
and compatible transformations with the defence
from hydraulic risk, the water resources
preservation, the protection of the river
environment and landscape, historical, artistic
and cultural values conservation, guiding the
choices of territorial organization.It is
obvious how the Pai (the project) recognizes the
close connection existing between territorial
planning and territorial management on the one
hand and the increase in vulnerability to floods
and the severity of hazard on the other hand. In
fact, each band defines the limits within which
watercourses can overflow into the neighbouring
territory, marking the time of return and the
interventions most necessary so that the damages
and danger could be minimized.
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• The competent authorities in the hydro geological
  and hydraulic field first of all are the Basin
  Authority of the Po river (legislation nr 183/89)
  who are able to adopt the hydrogeological
  structure plan, to which all the other
  instruments of territorial planning must be
  adapted.
• The Region adopts the territorial plan of
  regional programming (PTPR)
• The Province adopts the territorial plan of
  provincial coordination (PTCP)
• The Municipality, finally, adopts the general
  urban plan (PRG), that with the recent regional
  normative is one of 2 new instruments first the
  Municipal Operational Plan (POC) that is the
  implementation of the planning guidelines
  (five-year-plan validity) and secondly, the
  Municipal Structural Plan, containing long-term
  planning guidelines. The territorial planning
  system and its own instruments will be analyzed
  in the next meetings.

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1. The characteristics of the Po river basin
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1.1 The drainage basin morphological
characteristics
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1.2 Administrative characteristics

3210 Municipalities located in the river basin
area
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1.3 The drainage basin the drainage network
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1.4 The drainage basin the embankment system
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1.5 Homogeneous areas in relation to main
instability processes
Final area of the Po Valley protected by Po river
embankments (from Cremona to the sea)
Intermediate aea of the Po Valley protected by Po
river and backflow tributari embankments
Apennine piedmont area
Alpine piedmont area
Apennine mountain area
Cuneo Langhe and Monferrato hill area
Alpine mountain area
Large sub-alpine lakes
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2. Master plan (PAI)
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2.1 The general strategy of the plan
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2.2 The aims and goals of the plan
The plan for the Po river basin is a sector plan
for the area and provides information, regulatory
and technical-operative guidelines to plan and
develop actions and operating strategies in order
to conserve, protect and promote the area.....
(art.17, law 183/89)
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2.3 Strategies for the main drainage network
configuration
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2.4 The functions of Po river closed flood plains
in the embankment system
The different flood absorption effect ratio
depends on the incoming flood and the
contribution from right side tributaries (the
Oglio and Mincio) and left side tributaries (from
the Taro to the Panaro). Without flood plain
embankments, which enable the storage area near
to the flood peak area to be used, the
absorption effect of the flood plain areas would
be far lower.
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2.5 Criterion for marking river area sections
River area sections are marked out in order to
protect from hydraulic risks and maintain and
recover the river environment
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2.6 The river sections in the main drainage
network
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2.7 Built-up areas and infrastructures inside
the river area sections
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2.8 Strategies for configuration of the drainage
network and slopes in hill and mountain areas
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2.9 Reconnaissance of unstable areas

• Unstable areas were classified and mapped in
  relation to their degree of hazards, in the
  hydraulic and hydrogeological risks record

3,281 fan areas, affected by mass transport,
with 522 areas interfering with built-up areas
and infrastructures
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2.10 Marking the boundaries of areas with a very
high hydrogeological risk and works to reduce the
risk
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2.11 Procedures to adapt planning to the
regulations of the Master Plan PAI
Master Plan PAI
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2.12 Relations with provincial planning
PROMOTING INTER-INSTITUTIONAL REGIONAL, BASIN
AUTHORITY AND PROVINCIAL CHARTS TO PLAN JOINT
PROGRAMMES (article 1, section 11, Technical
regulations for implementation, Master Plan PAI)
Charts being prepared
Charts in the advanced processing stage and
already completed
The province submits studies underway and/or
planned
Assessment of the charts compatibility with the
Master Plan PAI, considering
1) whether information is more updated compared
to data in the Master Plan PAI
2) whether analyses are conducted with greater
detail compared to those in Master Plan PAI
Identify specific issues to explore further in
plans
3) whether classes identifying instability
conditions are uniform or in line with those in
the Master Plan PAI
4) whether the level of protection defined by
the plans regulations is lower than that in the
Master Plan PAI
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2.13 Financial programme for the Master Plan PAI
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2.14 Three-year plan to implement the Master Plan
PAI
The basin plans are implemented by three-year,
operational plans(article 1, law 189/89)
The three year plans target the following
actions
These particularly complex works are carried out,
under different types of agreements between
public authorities and private organisations.
The River Basin Authority promotes and
coordinates activities.
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2.15 Critical factors instrumental to successful
planning
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Conclusion

• For the next meetings in Andalusia
  and in Piacenza we propose a detailed analysis of
  the following issues
• -         interventions realized for the
  flood risks prevention in Piacenza
• I.                     river banks defences and
  river park of the Po river
• II.                   drainage system in the area
  where the logistic structures are based
• III.                  invasions of the water
  collection and water flow in case of floods,
  barely realized next to the city.
• -         the national-regional-local civil
  protection system, emergency plans for population
  protection
• -         the relationship between productive
  activities settlement and risks from floods and
  overflows.
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• Outline of a new method to evaluate
  the impact and consequences of a natural
  catastrophic event (a flood in this case) on the
  economic activities located in a given area and
  more generally on the economic system as a whole.
  An analysis of economic damages arising from the
  awareness of a 'system vulnerability' (involving
  not only the physical structures of the territory
  at risk but also the organisation, the service
  "networks", the links between activities
  seemingly very distant from one another but
  acting as part of a single complex sistem), we
  are thinking of this as a fundamental element for
  drafting rational risk-management strategies,
  i.e. geared towards the mitigation /reduction of
  damages themselves.

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