1. TWG Water Scarcity & Drought
Prague meeting,
Contribution of Arno River Basin Authority
Ing. Bernardo Mazzanti -

2. Test case for a first estimation of WEI+ index: Arno river basin
Basin surface: 8282 sq. km
WEI+ estimation on 9 different subbasins
WEI+ estimation on 9 different subbasins
For every subbasin, parameters and results of a distributed hydrological model (superficial water) are available for the period

3. Distribution of subbasin dimension

4. WEI+ - monthly estimation
(moving average on 12 months)

5. WEI+ - monthly estimation
(moving average on 12 months)
Spatial distribution - April 2002
WEI+ [%]

6. Conclusions
A preliminary estimation of WEI+ parameters was carried on the entire set of subbasin of Arno river basin
The use of a moving average on a 12 months window avoids negative or uncoeherent values
The variability in the considered time interval highlights water scarcity periods (to be tested)
The estimation on different subbasins points out the spatial variability of WEI+ parameter