Post on 28-Mar-2015
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IUAV Corso di perfezionamento in tutela e gestione del suolo e delle acque
Venezia 13 Aprile 2012
The Environmental Impact assessment in the urban
planning: the prevention of the hydraulic
hazard,the Hydraulic Compatibility
Assessment
Ing. Alessandro Pattaro
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1The Hydraulic Compatibility Assessment in Veneto
Development plan presentation
2Hydraulic Compatibility Assessment of Meolo’s PAT
3Hydraulic Compatibility Assessment of Maserada’s PAT
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1
in Veneto(VCI di PAT, PI, Piani attuativi)
The Hydraulic Compatibility Assessment
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Legal context of the Hydraulic CompatibilityThrough the DGRV 3637/02 the Veneto Region requires that the planning is subjected to Hydraulic compatibility assessment.
Article 3, LR 11/2004 Rules for the Government of the territory (known as new urbanism law)
4. The planning includes:a) plan land use district (PAT), plan of action by municipalities (IP), implementing urban development plans (PUA);b) Provincial Territorial Coordination Plan (PTCP);
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Objectives of the Hydraulic Compatibility
The adoption of new planning projects is subjected to compliance with the opinion expressed by the competent hydraulic authorities, identified by the Veneto Region in the unit of the Regional Civil Engineers.
The VCI hydraulic calculations aim to define the design interventions that have compensatory function to ensure the “hydraulic invariance”.
The principle of invariance is defined: hydraulic invariance means that the transformation of an area does not cause a worsening of the discharge of the river receiving the runoff originated from the same.
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Goals of the Hydraulic Compatibility
The fundamental purpose of the study is to support compatibility hydraulic evaluation, from the stage of conception:
• to ascertain the suitability of sites to accommodate the new building;• to consider the interference of the new settlements with present and potential hydraulic disruptions;• to determine possible changes in the hydraulic system caused by new locations or changes of land use.
In summary: the hydraulic study aims to verify the eligibility of the provisions contained in the planning projects, suggesting good solutions in terms of good managment of the territory.
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Scheme of the Hydraulic Compatibility
1 – Collection and analysis of data
2 – Analysis of precipitation
3 – waterproofing evaluation in areas of urban expansion
4 – Application of a hydrological model (comparison between different methods)
5 – Comparison of scenarios and evaluation of prevention, containment and mitigation of hydraulic risk
Hydrological assessment of flow outgoing from the
basin study
Parameters suggested from the local
managment authority
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2
Meolo’s PAT
Hydraulic Compatibility Assessment
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Customer: Tepco srl
Project: Valutazione di Compatibilità Idraulica del PAT del Comune di Meolo (VE)
First case: the Compatibility Hydraulic Assessment of Meolo’s PAT
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Geographical context
Roncade Musile di P.
F. Sile
Monastier di TVF. Piave
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Geographical context
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The areas potentially transformable
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The Piave ‘s PAI constraints, hazard mapping
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The Sile ‘s PAI constraints, hazard mapping
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The mathematical modeling 1d - 2d
The calculation grid
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The flooding simulation in Meolo
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The new hydraulic hazard map
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The hydraulic assessment
90 0 90 180 Meters
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_EDIFICIO_PAVIMENTAZIONI_VERDE
90 0 90 180 Meters
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_EDIFICIO_PAVIMENTAZIONI_VERDE
Before urbanization
After the waterproofing
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Which effects does the waterproofing area cause on the existing hydraulic system?
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Which effects does the waterproofing area cause on the existing hydraulic system? Valutazione del volume di compensazione
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Tempo [h]
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portata primadell'urbanizzazione
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The surface runoff increases and the stream becomes faster
Valutazione del volume di compensazione
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portata primadell'urbanizzazione
portata dopol'urbanizzazione
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The surface runoff increases and the stream becomes faster
Valutazione del volume di compensazione
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portata primadell'urbanizzazione
portata dopol'urbanizzazione
To ensure the hydraulic
invariance is necessary to
create a compensation
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How to achive the mitigation and compensation measures
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How to achive the mitigation and compensation measures
1 – to insert a reducing flow device in the upstream section ahead the final delivery
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How to achive the mitigation and compensation measures
1 – to insert a reducing flow device in the upstream section ahead the final delivery (ditch, river)
2 – to achieve a compensation upstream volume
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How to connect the hydraulic network to final delivery (ditch, river)
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How to design the reducing discharge device
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VCI conclusions
The Hydraulic Compatibility Assessment ends with the requirements that are incorporated in the Technical Rules of PAT
Constraints, requirements and guidelines prescribe the necessary measures to ensure the hydraulic invariance of the urban development
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3
Maserada’s PAT
Hydraulic Compatibility Assessment
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Customer : Comune di Maserada sul Piave
Project : Valutazione di Compatibilità Idraulica del PAT del Comune di Maserada sul Piave (TV)
Second case: the Compatibility Hydraulic Assessment of Maserada’s PAT
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3 0 3 6 Kilometers
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Confini ComunaliArgine S. MarcoIdrografica principaleLEGENDA
Geographical context
Cimadolmo
Villorba
Spresiano
Breda di Piave
F. Piave
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The Piave ‘s PAI constraints, hazard mapping
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Pericolosità idraulica PAI PiaveFP1P2P3
Confini amministrativi
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The soil permeability (hydraulic conductivity)
3 0 3 6 Kilometers
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LEGENDA - PermeabilitàBassa (Argilla)Elevata (Ghiaia)Media (Sabbia)
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The groundwater depth
2 0 2 4 Kilometers
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LEGENDA - Profondità falda freatica0-2 m2-5 m5-10 m
Limite fascia risorgive
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Hydraulic runoff through infiltration device