sentences:  Several projects have been undertaken to help the mussel population including limiting sediment flow in the river and the introduction of freshwater trout into the river.Previously, water that was piped from Catcleugh Reservoir to Whittle Dene Reservoir (at Harlow Hill), was cleaned annual of its harmless sediment, but the wast water was pumped into the Rede.A remedial programme costing £500,000 was implemented in 2019 to stop this from happening.