LAGO Project - Lago Trasimeno

Trasimeno





LAGO Project ... the Elaborations



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The following graphic shows the mean level of Trasimeno Lake from 1988 to 2007. It plots monthly avarage values got from San Savino hydrometer (better than Isola Polvese hydrometer). Correct values are considered to be that ones with difference lower than 3 cm from the 10 previous measurements and the 10 next measurements (10 acquisitions represent 5 hours, since the stations acquire data every 30 minutes). In this way we deleted many errors due to the natural waves, boat waves and other not expected phenomena. Since 1989 the level was always below the hydrometric zero and, in spite of the seasonal periodic trend (usually with minimum during September/October and maximum during February/March), the global trend was always negative until 2003. Thank to the obstruction of Provincia di Perugia it is not possible to provide the latest updates.

In the following graphics you can see the extreme values of annual levels of Trasimeno Lake in comparison with the mean annual level and the hydrometric zero. The minimum value was -187 cm (255.46 m slm) between 15th and 20th October 2003, the minimum mean annual value was in 2004 with -150.6 cm.
Minimum values [cm] 1988-2005:
-3 -27 -80 -85 -66 -83 -86 -110 -130 -114 -97 -108 -114 -114 -142 -187 -174 -144
Maximum values [cm] 1988-2005:
56 18 -11 -32 -17 -23 -28 -50 -83 -57 -41 -55 -46 -41 -100 -100 -124 -63
Mean values [cm] 1988-2005:
25.4 -11 -43.5 -53 -36.2 -43.7 -57.9 -81.5 -101.8 -77.8 -67.2 -79.1 -78.8 -76 -120.6 -140.2 -150.6 -114.4



The following graphic shows the cumulated rain for each weather station of Trasimeno basin and the mean value of the basin. Please note:
- La Cima weather station (not so far from the lake coast, but with really different elevation) usually acquired bigger amount of rain than the other stations
- Years 2002 and 2003, were very dry and you can note the correlation between the minimum amount of rain and the minimum hydrometric level in the same period






2013@Riccardo Biondi