Section 13. Appropriation of Property—Improvements. the Board of

park commissioners of such cities of the first and second classes, as supplemental to other powers conferred by this act, shall have the power, whenever in their discretion such course is advisable, to appropriate property in the manner hereinafter provided for the purpose of: (a) establishing a park, parkway, pleasure driveway or boulevard, or (b) widening or extending any park, parkway, pleasure driveway or boulevard, or (c) opening, widening, or extending any route or right of way for a sewer or channel of any water course connected with or necessary for the protection of any park, parkway, pleasure driveway or boulevard, or (d) constructing any embankment or levee along such water course for the protection of any such park, parkway, pleasure driveway or boulevard, or (e) constructing any bridge or viaduct upon or connected with any such park, parkway, pleasure driveway or boulevard, or (f) converting any street or alley connecting any parks, parkways and boulevards in any such city into a boulevard or pleasure driveway; and also said board shall have power, in the same proceedings, to provide for the construction of improvements of such property for a park, parkway, pleasure driveway or boulevard, in case such property is appropriated or to be appropriated for such purpose; or to provide for the construction necessary for the widening or extending of the same, in case such be the purpose for which the land is appropriated or to be appropriated; or to provide for the construction necessary for the opening, widening or extending of any such route or right of way for a sewer or channel of any such water course, in case such property is appropriated or to be appropriated for such purpose; or to provide for the construction of any such embankment or levee along any such water course as aforesaid, in case such property is appropriated or to be appropriated for such purpose; or to provide for the construction of any such bridge or viaduct, in case such be the purpose for which such property is appropriated or to be appropriated; or to provide for the converting of any such street or alley into a pleasure driveway or boulevard, in case such be the purpose of the appropriation; furthermore, such board may provide for the construction of any of the foregoing work or improvements when the property or part thereof necessary for the same has been secured by contract or otherwise as hereinafter provided.