Eugène Belgrand
...that under the guidance of civil engineer Eugène Belgrand, Paris's sewer system expanded four-fold between 1852 and 1869?
...that under the guidance of civil engineer <b id="mwC_w"><a href="./Eugène_Belgrand" id="mwC_0" rel="mw:WikiLink" title="Eugène Belgrand">Eugène Belgrand</a></b>, <a href="./Paris" id="mwC_4" rel="mw:WikiLink" title="Paris">Paris</a>'s sewer system expanded four-fold between 1852 and 1869?