A prospectus was issued which contained a detailed breakdown of the likely costs, revenue and profits of such a scheme, and the promoters prepared to obtain an Act of Parliament. During this time, someone challenged the original survey and another local surveyor was asked to review it. John Beauchamp suggested that no locks would be required on the upper section, but that costs were likely to be £15,234. This was later raised to £18,000, and the Act of Parliament, which authorised the construction of a canal that followed Hammett's plans, was obtained on 28 May 1827. The proprietors were empowered to raise £18,000 by the issue of 360 shares of £50 each, with powers to raise another £5,000 by mortgage, or to borrow any part of the £18,000 from the Exchequer Bills Commissioners.