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Ing. Alessandro Pattaro

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. Development plan presentation.

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Ing. Alessandro Pattaro

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  1. IUAV Corso di perfezionamento in tutela e gestione del suolo e delle acque Venezia 13 Aprile 2012The Environmental Impact assessment in the urban planning: the prevention of the hydraulic hazard,the Hydraulic Compatibility Assessment Ing. Alessandro Pattaro

  2. Development plan presentation The Hydraulic Compatibility Assessment in Veneto 1 Hydraulic Compatibility Assessment of Meolo’s PAT 2 Hydraulic Compatibility Assessment of Maserada’s PAT 3

  3. in Veneto(VCI di PAT, PI, Piani attuativi) The Hydraulic Compatibility Assessment 1

  4. Legal context of the Hydraulic Compatibility Through 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);

  5. 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.

  6. 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.

  7. 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) Parameters suggested from the local managment authority Hydrological assessment of flow outgoing from the basin study 5 – Comparison of scenarios and evaluation of prevention, containment and mitigation of hydraulic risk

  8. Meolo’s PAT Hydraulic Compatibility Assessment 2

  9. First case: the Compatibility Hydraulic Assessment of Meolo’s PAT Customer: Tepco srl Project: Valutazione di Compatibilità Idraulica del PAT del Comune di Meolo (VE)

  10. Geographical context Monastier di TV F. Piave Musile di P. Roncade F. Sile

  11. Geographical context

  12. The areas potentially transformable

  13. The Piave ‘s PAI constraints, hazard mapping

  14. The Sile ‘s PAI constraints, hazard mapping

  15. The mathematical modeling 1d - 2d The calculation grid

  16. The flooding simulation in Meolo

  17. The new hydraulic hazard map

  18. The hydraulic assessment Before urbanization After the waterproofing

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

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

  21. The surface runoff increases and the stream becomes faster

  22. The surface runoff increases and the stream becomes faster To ensure the hydraulic invariance is necessary to create a compensation

  23. How to achive the mitigation and compensation measures

  24. How to achive the mitigation and compensation measures 1 – to insert a reducing flow device in the upstream section ahead the final delivery

  25. 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

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

  27. How to design the reducing discharge device

  28. 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

  29. Maserada’s PAT Hydraulic Compatibility Assessment 3

  30. Second case: the Compatibility Hydraulic Assessment of Maserada’s PAT Customer : Comune di Maserada sul Piave Project : Valutazione di Compatibilità Idraulica del PAT del Comune di Maserada sul Piave (TV)

  31. Geographical context Cimadolmo Spresiano F. Piave Villorba Breda di Piave

  32. The Piave ‘s PAI constraints, hazard mapping

  33. The soil permeability (hydraulic conductivity)

  34. The groundwater depth

  35. Hydraulic runoff through infiltration device

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