ie ' s ▁new ▁Ma ud ▁F oster ▁S lu ice ▁was ▁completed ▁in ▁the ▁following ▁year . ▁Under ▁the ▁Act s , ▁the ▁D rain age ▁District ▁was ▁extended ▁to ▁include ▁the ▁East ▁Fen . ▁Although ▁Boston ▁was ▁flo oded ▁in ▁ 1 8 1 0 , ▁the ▁East ▁and ▁West ▁F ens ▁were ▁declared ▁to ▁be ▁in ▁good ▁order ▁soon ▁afterwards . ▁ ▁The ▁construction ▁of ▁Hob hole ▁sl u ice ▁was ▁the ▁first ▁time ▁that ▁a ▁steam ▁engine ▁is ▁known ▁to ▁have ▁been ▁used ▁in ▁connection ▁with ▁F ens ▁d rain age . ▁In ▁order ▁to ▁keep ▁the ▁found ations ▁for ▁the ▁sl u ice ▁free ▁from ▁water , ▁they ▁were ▁p ump ed ▁out ▁by ▁a ▁B oul ton ▁& ▁W att ▁steam ▁engine , ▁r ated ▁at ▁. ▁The ▁machine ▁last ed ▁until ▁at ▁least ▁ 1 8 1 4 , ▁just ▁ 3 ▁years ▁before ▁the ▁first ▁permanent ▁steam ▁p ump ing ▁station ▁was ▁built ▁at ▁S utton ▁St . ▁Edmund ▁in ▁South ▁Holland . ▁ ▁The ▁Four th ▁District ▁was ▁extended ▁in ▁ 1 8 1 8 , ▁following ▁another ▁report ▁by ▁R enn ie ▁on ▁the ▁lower ▁reaches ▁of ▁the ▁Ste eping ▁River . ▁An ▁Act ▁of ▁Parliament ▁was ▁obtained ▁in ▁the ▁same ▁year , ▁which ▁author ised ▁the ▁straight ening ▁of ▁the ▁river , ▁and ▁the ▁addition ▁of ▁, ▁subsequently ▁known ▁as ▁" the ▁ 5 0 0 0 ▁acres ", ▁to ▁the ▁district . ▁This ▁area ▁was ▁located ▁on ▁the ▁north - e