The gauge at Carasco was discontinued and has been replaced by S.Martino, which is just upstream of the Sturla tributary (so it's still very indirect, but less so than Carasco). The old calibrations are now meaningless

The gauge at Carasco is indirect: on the Entella river, a very long way downstream of the take-out and below several important tributaries.
If the gauge is already on the low side and going down: this section is likely already dry/too low.
If the gauge is medium or high and increasing: this section is likely flooding.
Always be mindful of where the gauge is located.