▁would ▁present ▁serious ▁engineering ▁problems ▁as ▁a ▁result ▁of ▁his ▁previous ▁experience ▁with ▁the ▁man ure ▁canal , ▁but ▁he ▁seriously ▁under est im ated ▁the ▁cost ▁at ▁£ 9 , 0 0 0 . ▁ ▁A ▁prospect us ▁was ▁issued ▁which ▁contained ▁a ▁detailed ▁break down ▁of ▁the ▁likely ▁costs , ▁re venue ▁and ▁prof its ▁of ▁such ▁a ▁scheme , ▁and ▁the ▁prom ot ers ▁prepared ▁to ▁obtain ▁an ▁Act ▁of ▁Parliament . ▁During ▁this ▁time , ▁someone ▁challeng ed ▁the ▁original ▁survey ▁and ▁another ▁local ▁survey or ▁was ▁asked ▁to ▁review ▁it . ▁John ▁Be auch amp ▁suggested ▁that ▁no ▁lo cks ▁would ▁be ▁required ▁on ▁the ▁upper ▁section , ▁but ▁that ▁costs ▁were ▁likely ▁to ▁be ▁£ 1 5 , 2 3 4 . ▁This ▁was ▁later ▁raised ▁to ▁£ 1 8 , 0 0 0 , ▁and ▁the ▁Act ▁of ▁Parliament , ▁which ▁author ised ▁the ▁construction ▁of ▁a ▁canal ▁that ▁followed ▁Hamm ett ' s ▁plans , ▁was ▁obtained ▁on ▁ 2 8 ▁May ▁ 1 8 2 7 . ▁The ▁propriet ors ▁were ▁emp ower ed ▁to ▁raise ▁£ 1 8 , 0 0 0 ▁by ▁the ▁issue ▁of ▁ 3 6 0 ▁shares ▁of ▁£ 5 0 ▁each , ▁with ▁powers ▁to ▁raise ▁another ▁£ 5 , 0 0 0 ▁by ▁mort g age , ▁or ▁to ▁borrow ▁any ▁part ▁of ▁the ▁£ 1 8 , 0 0 0 ▁from ▁the ▁Ex che quer ▁B ills ▁Commission ers . ▁ ▁Const ruction ▁Const ruction ▁began