From the early 1960's there has been a process of urbanization which increased the population with a settlement system
characterized by intensive urban sprawl. As a results, within the GRA urban expansion has left large patches of non-urbanized green and vacant areas. UA occurs mainly within these areas, nowadays organized in a system of parks
which extend close to the city centre, providing multiple ecosystem services and public goods.
Data sources
The estimation of the irrigation water demand and of the amount of water potentially harvested by roofs for each RG was realized by using the following dataset:
geodatabase containing RGs polygons and land use attributes;
average crop coefficients for each RG based on the land use class associated;
climate data of the study area (precipitation and evapotranspiration).
Processing
The water consumption for each cultivated parcel was assessed by computing the Irrigation Water Requirement
(IWR) for the irrigation season (April-September). IWR can be defined as the amount of water, net of effective
precipitation, needed to fulfil evapotranspiration for maximum plant growth and yield of a given crop in a specific
climate regime and at a given time of its phenology: