Corporations formed under this article shall have power to borrow such sums of money as may be necessary for the construction, completion or operation of their reservoirs, canals and ditches, or pipelines, or the purchase of any lands, water rights or other property necessary, in order to carry out the objects for which they were incorporated; and to issue and dispose of their bonds for any amount so borrowed, and to mortgage their corporate property and franchises to secure the payment of any debt contracted for the purpose aforesaid.