The City Council shall have sole power to determine the places in said parks where sewers, gas, and water pipes shall be laid; and no trench, for these purposes, shall be opened until the City Council has designated the location of the same and given permission in writing. No telegraph, telephone, or electric light wires, or other wires, or posts or supports therefor, shall be erected in, upon, through, or over said parks without the consent in writing of the City Council, who shall designate the place and manner of maintaining the same, to be altered at such time and in such manner and under such conditions as the City Council shall deem best.