The cleanest lake in Europe
Thanks to the association CO.BA.L.B among the communes situated on the lake, the commune of Bagnoregio and the provincial administration of Viterbo, the Bolsena lake results to be provided with a purification system for the waters that the communes introduce in the lake making the bathing pure over than 90%.The water-conditioner, through a manifold around the lake (about 30 Kms length), picks up the waters of the communes and it transports them to itself where they are treated.
The lifting stations are 17, situated along the run of the collector and each of them pumps sewages first with pressure up to the point of disconnection where the sewages fall for gravity up to the following lifting station from where they are thrown again with pressure.
Every station is completely underground and furnished with an own electric feeding box, with a backup pomp and with an automatic generator.In case of breakdown because of anomaly of the system or emergency, a telecontrol system will signal to the specialized technicians the problem.
The water-conditioner is situated on the banks of the emissary Marta river and it is a biological purification plant with primary sedimentation and aerobic discharge of the muds and it is able to treat sewages for 40.000 inhabitants.
At the end of the treatment and of purification’s process the water, that result to be perfectly purified within the limits of the chart «A» as enacted by law, is introduced into the Marta river to end then its run in the Tyrrhenian Sea.
The purification plant is modular and thanks to this characteristic it is useable in different periods of the year according to the big or small sewages’ influx. Soon we will publish shortly letters of the readers about the lake.
TECNICAL DATA
| Origin | Vulcanic |
| Period of formation | 320.000 years ago |
| Altitude | 305 m s.l.m. |
| Area | 113.5 km2 |
| Volume | 9.2 km3 |
| Depht. max. | 151 m |
| Depht. medium | 81 m |
| Surface of the territory that convoglia water (river basin of water-drainage) | 273 km2 |
| Water unloaded through emissary | 2.42 m3 by second |
| I renew | 120.6 anni |
Medium temperatures in water
| Depth in meters | Temperature in degrees °C |
| From Dicember to April
|
|
| From 0 to -5 | From 12 to 10 |
| From -5 to -45 | 8 |
| From -45 to -130 | 7,5 |
| From May to August
|
|
| From 0 to -5 | From 27 to 10 |
| From -5 to -20 | From 18 to 12 |
| From -20 to -45 | From 12 to 7,5 |
| From -45 to -130 | 7,5 |
| September
|
|
| From 0 to -20 | 20 |
| From -20 to -45 | From 20 to 7,5 |
| From -45 to -130 | 7,5 |
| From October to November
|
|
| From 0 to -30 | From 15 to 12 |
| From -30 to -45 | From 12 to 8 |
| From -45 to -130 | 7,5 |
BATHYMETRIC MAP
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| di massima>>> | originale>>> | colore>>> |
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