The Environment Agency has issued a flood alert for the Rivers Caldew and Petteril.
Heavy and persistent rain is expected to spread in from the west, lasting until Sunday. The rain and widespread snowmelt means there is a possibility of flooding.
All of Cumbria will be affected, mainly on higher grounds. Flooding is possible for the rivers from the Lakeland fells to where they meet the Eden in Carlisle, including Greystoke, Newton Reigny, Plumpton, Stockdalewath, Sebergham and Denton Holme in Carlisle.
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Sandy Murray, of Police Scotland, was was giving evidence at the trial of a bus driver who denies killing Ryan Baird by dangerous driving.
34-year-old Christopher Peck was involved in a head-on crash with a drunk driver. His funeral has taken place in his hometown, Workington.
The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.