<prompt> Pedzisa mutsara unotevera: Masisitimu emazuva ano okuyerera mvura haana kuoneka kutozosvikira muzana remakore rechi19 kuWestern Europe, kunyange zvazvo mazhinji emasisitimu aya akanga avakwa zvikurukuru kuti agadzirise zvinetso zvemvura yakasviba zvinomuka kubva mukukura nokukurumidza kwemaguta. Mumwe muenzaniso wakadaro ndewefesheni yokuLondon, iyo yakavakwa kurwisa kusvibiswa kukuru kwoRwizi rwaThames. Panguva iyoyo, Rwizi rwaThames ndirwo rwaiva chinhu chikuru pakurasa tsvina muLondon, tsvina yevanhu ichiungana mumvura yaiva pedyo nepakati peguta raiva nevanhu vakawanda. Somugumisiro, hosha dzinoverengeka dzakatambudza vagari veLondon uye kunyange nhengo dzeParamende, kubatanidza zviitiko zvinozivikanwa se  <response>: Kupararira kwecholera muBroad Street muna 1854 uye Great Stink muna 1858. Kuva nehanya noutano hwevanhu uye kunaka kwoupenyu kwakaita kuti pave nezvirongwa zvakawanda, zvakazoita kuti pave negadziriro yemazuva ano yokufambisa tsvina muLondon yakagadzirwa naJoseph Bazalgette. Iyi gadziriro itsva yakanangidzirwa zvakananga pakuva nechokwadi chokuti mvura yakasviba inodzorerwa kure nemanyuko emvura sezvinobvira kuitira kuderedza tyisidziro yezvirwere zvinoparadzirwa nemvura. Kubvira ipapo, migero yakawanda yemvura mumaguta yave ichinangidzira ngwariro pazvinangwa zvakafanana zvokudzivisa ngwavaira dzoutano hwavanhu. 