Guernsey Water say the island's 100 miles of fresh water douits are vital for water catchment.
Despite this week's unsettled and rainy weather, May saw recording breaking high temperatures and the spring was the fifth driest on record.
Guernsey Water's Operations manager, Jon Holt, says the island's streams, known in Guernsey French as 'douits' play a vital role in raw water collection and this is why flow needs to be unobstructed of vegetation and rubbish:
"With approximately 165km of streams and douits around the Island, the clearance is vitally important in ensuring we are able to effectively capture as much water as possible to top up the Island’s stored supply, and reduce potential flooding.
"Weather conditions in general over recent years have been incredibly variable, so doing anything we can to help the Island through both unusually dry or unusually wet periods is more important than ever.”
The deadline for landowners to clear their douits is 15 June and each one is inspected by officials from the parish Douzaine.
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