Results

Recommendation for Hydrogeological Risk Protection in the Brindisi Area

A direct result of this work is the creation of the Brindisi Web GIS platform.

In relation to Chapter 5 descriptions, it appears that the territory of Brindisi, both for the coastal areas and for the urban area, is characterized by geomorphological and hydraulic risks.

It is summarized that the geomorphological risk is represented by coastal landslides, such as falls and topplings, while the hydraulic one is represented by floodings.

Therefore it is necessary to refer to recommendations, in accordance with the current legislation, in order to mitigate the hydrogeological risk phenomena.

The areas affected by geomorphological risk are subdivided into PG3 zones (very high geomorphological hazard), PG2 (high geomorphological hazard) and PG1 (medium and moderate geomorphological hazard). In the delimited geomorphological risk areas it is necessary to foresee:

  • interventions and works of active and passive defense for the safety of the areas and for the reduction or elimination of the danger, including the realization of monitoring and control systems of the stability of the territory;
  • interventions of environmental improvement of the forest heritage, re- naturalization of the areas in which agriculture was abandoned, aimed at reducing geomorphological hazard, increasing the stability of the land and reconstituting natural balances. The interventions do not interfere negatively with the evolution of instability processes and they should favor the reconstitution of native spontaneous vegetation;
  • urgent interventions to safeguard people and property in the face of dangerous events or exceptional risk situations.

In particular in the PG3 areas the following are allowed:

  • interventions for consolidation, accommodation and mitigation of landslides, as well as those aimed at investigating and monitoring the geomorphological processes that determine very high dangerous conditions. The interventions are subjected to the favorable or not favorable opinion of the Basin Authority institution;
  • interventions necessary for the maintenance of public works or of public interest;
  • restructuring works of public works and infrastructures as well as the viability and network of existing private services that cannot be relocated; the interventions should carried out without aggravating the conditions of instability and do not compromise the possibility of carrying out the consolidation of the area and the maintenance of the consolidation works ;
  • demolition work without reconstruction, ordinary and extraordinary maintenance, restoration, conservative restoration;
  • adjustments necessary to legalize the structures and buildings with respect to the provisions of hygiene, health, seismic, safety and hygiene at work and to overcome architectural barriers;
  • interventions on existing buildings aimed at reducing vulnerability, improving the protection of public safety; the interventions do not increase in surface and volume;

In the PG2 type areas, the following are allowed:

  • the volumetric expansions of the existing buildings exclusively aimed at the realization of hygienic services, technical volumes, garages, in order to make them habitable without creating new building volumes. The volumetric expansion must be illustrated and linked to a geological and geotechnical study showing their compatibility with the dangerous conditions affecting the area;
  • works and maintenance works on condition that a geological and geotechnical studies show the compatibility of the interventions with the geomorphological instability of the area. It is necessary to demonstrate that the consolidation and safety measures are previously carried out with the overcoming of the safety factor of the study area.

In the PG1 type areas, the following are allowed:

  • works envisaged by the territorial governance in safety condition compared to environment. The works do not cause unstable conditions and do not modify negatively the geomorphological conditions and processes in the area.

Finally, for any admitted structural works in a risk areas, it is recommended to provide a geological and geotechnical compatibility studies that highlight the effects of the works on the stability of the study area.

The areas affected by hydraulic risk are subdivided into AP (very high hydraulic hazard), MP (medium and moderate hydraulic hazard) and BP (low hydraulic hazard) zones. In hydraulic risk areas the following must be envisaged:

  • hydraulic works for the safety of the areas and for the reduction or elimination of the danger;
  • the interventions of environmental improvement which favour the natural processes and the reconstitution of native spontaneous vegetation;
  • urgent interventions to protect people and property against dangerous events or exceptional risk situations.

In detail in the AP areas, the following will be allowed:

  • hydraulic arrangement work;
  • interventions for the adaptation and restructuring of the roads and the network of existing public and private services. The works should carried out in conditions of hydraulic safety in relation to the nature of the intervention and the territorial context;
  • interventions for the maintenance of public works;
  • restructuring of existing public or public network infrastructures and non- delocalisable public services. The construction of the new public network infrastructures, including the service structures;
  • works on existing buildings aimed at reducing their vulnerability and improving the protection of public safety;
  • demolition of the structures without reconstruction, ordinary and extraordinary maintenance interventions, restoration and conservation provided that they do not contribute to increasing the urban load;
  • necessary adjustments to bring the structures, buildings and plants up to standard with respect to the provisions regarding hygiene, health, seismic and safety;
  • volumetric expansions of existing buildings exclusively aimed at the realization of hygienic services or hygienic-sanitary adjustments, technical volumes and garages;
  • realization of fences, appurtenances, precarious artefacts, environmental remodeling without increase the level of danger and without the creation of volumes and/or impermeable surfaces.

In the MP type areas you will admit:

  • hydraulic refurbishment interventions approved by the competent hydraulic authority;
  • upgrading and restructuring of the roads and the network of existing public andprivate services, provided they are carried out under hydraulic safety conditions;
  • interventions necessary for the maintenance of public works;
  • expansion and restructuring of existing public or public network infrastructures;
  • interventions on existing buildings, aimed at reducing their vulnerability and improving the protection of public safety;
  • demolition interventions without reconstruction, ordinary and extraordinary maintenance interventions, restoration and conservative restoration;
  • adjustments necessary to bring the structures, buildings and systems up to standard with respect to the guidelines regarding safety of hygiene, health and seismic;
  • volumetric expansions of existing buildings aimed at the realization of hygienic services or hygienic-sanitary adjustments, technical volumes and garages;
  • realization of fences, appurtenances, precarious artefacts without increase the level of danger; interventions of environmental reshaping without the creation of volumes and/or impermeable surfaces;
  • building renovation interventions provided that they do not increase the level of danger in adjacent areas;
  • further types of interventions equipped with hydraulic works in order to guarantee the hydraulic safety with a return time of 200 years; the interventions are subject to the favorable opinion of the competent hydraulic authority.

In BP type areas you will admit:

  • interventions envisaged by territorial governance instruments, provided they are carried out in conditions of hydraulic safety in relation to the nature of the intervention and the territorial context.

Finally, for any works and structural interventions, which are permitted in hydraulic risk areas, must be supported by an hydrological compatibility study with numerical modelling.