sentences:  They were each built with a side pond, which enabled some of the water to be re-used during a filling and emptying cycle.The side ponds have been disused for many years, but there are plans to reinstate one of them for demonstration purposes.The Macclesfield Canal was authorised by an Act of Parliament obtained in April 1826, after the civil engineer Thomas Telford had produced two reports and estimated that the canal could be built for £295,000.