In the case of protection of the waters is distinguished between the protection of the appearance quality,i.e. the chemical state of the water bodies from pollutants,and the protection of appearance toensure proper water management and to avoid overuse that could have effects of unsustainable depletion of water resources and prejudice of the hydrogeological structure of the territory. For this purpose, the national territory is divided into the water districts provided for byArticle 64 of D.lgs 152/2006.

For each of them is established basin authority,which is responsible for preparing the District Basin Plan,which has the value of the territorial plan of the sector and is the cognitive, regulatory and technical-operational tool with which actions and rules of use aimed at conservation, defense and land enhancement and proper water use. It is in the category of acts of address and coordination with a mixed legal nature and with indeterminate validity.

The basin plan,before its approval, is subject to a strategic environmental assessment (VAS)at the state level, and is implemented through three-year intervention programmes.

The protection of quantitative water,under Article95 D.lgs 152/2006,is integrated with the qualitative one and therefore contributes to the achievement of the quality objectives of the water bodies depending on their specific destination. Title II of Part 3 of the Environment Code. The water budget is a key instrument in the Water Protection Plan referred to in art. 121 D.lgs 152/2006.

The development of the Plan, which constitutes the sector excerpt of the Basin Plan,is assigned to the Regions, in accordance with the Basin Authorities. At the heart of the Protection Plan is the knowledge of the natural quantitative aspects that characterize water bodies in order to achieve the two main objectives of the Plan:

– the maintenance or rebalancing of the water balance between availability and levies, which is essential to define the compatible uses of water resources in order to safeguard them in the future;

– the estimation of the quality characteristics of water bodies through the intensification of monitoring and the consequent definition of interventions to achieve quality goals.

The measures to ensure the balance of thewater budget must be applied, especially when the concessions of derivation are granted, which are governed by the Royal Decree No. In 1933, there were extensive and appropriate changes in terms of savings and water recycling by art. 96 D.lgs 152/2006.