The benefits are : 
                         1) IRRIGATION : By linking rivers vast amount of land areas will be irrigated and land will become fertile .
                         2) FLOOD PREVENTION :  During heavy rainy seasons  some areas can experience a heavy flood while other areas might be drought like situations . With network of rivers this problem can be greatly avoided by channeling excess water to the areas that are not experienced flood or dry .
                               3) GENERATION OF ELECTRICITY : With new canals built , feasibility of new dams to generate hydroelectric power becomes  a possibility .
                               4) NAVIGATION: Newly created network of canals open up new routes and ways , routes that of water navigation , which is generally more cheaper and efficient compared to road transport . 
             HOPE YOU WILL LIKE IT ........... BEST OF LUCK .......
                                           THANK YOU !!!!