1 . ▁ ▁The ▁ 1 8 0 1 ▁Act ▁was ▁supp lement ed ▁by ▁a ▁second ▁Act ▁obtained ▁two ▁years ▁later . ▁The ▁principal ▁engineering ▁works ▁were ▁the ▁West ▁Fen ▁C atch water ▁D rain , ▁a ▁ ▁channel ▁around ▁the ▁northern ▁edge ▁of ▁the ▁West ▁Fen ; ▁the ▁East ▁Fen ▁C atch water ▁D rain , ▁a ▁ ▁channel ▁around ▁the ▁northern ▁edge ▁of ▁the ▁East ▁Fen ; ▁the ▁Stone bridge ▁D rain , ▁a ▁ ▁channel ▁which ▁connected ▁Cher ry ▁Cor ner ▁to ▁Cow bridge ; ▁upgrad ing ▁of ▁the ▁Ma ud ▁F oster ▁d rain ▁and ▁the ▁provision ▁of ▁a ▁new ▁sl u ice ▁where ▁it ▁met ▁The ▁H aven ; ▁and ▁construction ▁of ▁the ▁Hob hole ▁D rain , ▁running ▁for ▁ ▁from ▁To ynt on ▁St ▁Peter ▁to ▁the ▁new ▁Hob hole ▁sl u ice . ▁Most ▁of ▁the ▁main ▁dra ins ▁which ▁are ▁now ▁navig able ▁were ▁exc av ated ▁or ▁improved ▁as ▁part ▁of ▁this ▁work , ▁including ▁Castle ▁Dy ke , ▁Fr ith ▁Bank ▁D rain , ▁Med lam ▁D rain , ▁New ham ▁D rain ▁and ▁West ▁Fen ▁D rain ▁in ▁the ▁West ▁Fen . ▁In ▁addition ▁to ▁Hob hole ▁D rain , ▁Bar l ode ▁D rain , ▁Bell water ▁D rain , ▁F od der ▁Dy ke , ▁La de ▁Bank ▁D rain ▁and ▁Thor pe ▁D rain ▁were ▁constructed ▁in ▁the ▁East ▁Fen . ▁Hob hole ▁S lu ice ▁was ▁opened ▁in ▁ 1 8 0 6 ▁and ▁R enn