§ (2) A petition for an Order may be presented, in the case of a proposal for the definition of the limits of a commission of sewers, by the commission, and in the case of a proposal to alter or supplement a local Act conferring powers on a drainage authority, by that authority, or by the council of any administrative county or county borough in which any part of the drainage area of that authority is situate, and in other cases by—
- (a) the proprietors of one-tenth of the area proposed to be constituted a separate drainage district, or of the area proposed to be added to or excluded from a drainage district;