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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


1The Hydraulic Compatibility Assessment in Veneto

Development plan presentation

2Hydraulic Compatibility Assessment of Meolo’s PAT

3Hydraulic Compatibility Assessment of Maserada’s PAT


1

in Veneto(VCI di PAT, PI, Piani attuativi)

The Hydraulic Compatibility Assessment


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);


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.


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.


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


2

Meolo’s PAT

Hydraulic Compatibility Assessment


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


Geographical context

Roncade Musile di P.

F. Sile

Monastier di TVF. Piave


The areas potentially transformable


The Piave ‘s PAI constraints, hazard mapping


The Sile ‘s PAI constraints, hazard mapping


The mathematical modeling 1d - 2d

The calculation grid


The flooding simulation in Meolo


The new hydraulic hazard map


The hydraulic assessment

90 0 90 180 Meters

N

EW

S

_EDIFICIO_PAVIMENTAZIONI_VERDE

90 0 90 180 Meters

N

EW

S

_EDIFICIO_PAVIMENTAZIONI_VERDE

Before urbanization

After the waterproofing


Which effects does the waterproofing area cause on the existing hydraulic system?


Which effects does the waterproofing area cause on the existing hydraulic system? Valutazione del volume di compensazione

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0.02

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0.08

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0 1 2 3 4 5 6 7 8

Tempo [h]

port

ata

[m³/

s]

portata primadell'urbanizzazione


The surface runoff increases and the stream becomes faster

Valutazione del volume di compensazione

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0 1 2 3 4 5 6 7 8

Tempo [h]

port

ata

[m³/

s]


portata dopol'urbanizzazione


The surface runoff increases and the stream becomes faster

Valutazione del volume di compensazione

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0 1 2 3 4 5 6 7 8

Tempo [h]

port

ata

[m³/

s]


portata dopol'urbanizzazione

To ensure the hydraulic

invariance is necessary to

create a compensation


How to achive the mitigation and compensation measures



1 – to insert a reducing flow device in the upstream section ahead the final delivery



1 – to insert a reducing flow device in the upstream section ahead the final delivery (ditch, river)

2 – to achieve a compensation upstream volume


How to connect the hydraulic network to final delivery (ditch, river)


How to design the reducing discharge device


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


3

Maserada’s PAT

Hydraulic Compatibility Assessment


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


3 0 3 6 Kilometers

N

EW

S

Confini ComunaliArgine S. MarcoIdrografica principaleLEGENDA


Cimadolmo

Villorba

Spresiano

Breda di Piave

F. Piave


The Piave ‘s PAI constraints, hazard mapping

N

EW

S

Pericolosità idraulica PAI PiaveFP1P2P3

Confini amministrativi


The soil permeability (hydraulic conductivity)

3 0 3 6 Kilometers

N

EW

S

LEGENDA - PermeabilitàBassa (Argilla)Elevata (Ghiaia)Media (Sabbia)


The groundwater depth

2 0 2 4 Kilometers

N

EW

S

LEGENDA - Profondità falda freatica0-2 m2-5 m5-10 m

Limite fascia risorgive


Hydraulic runoff through infiltration device

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