<p>This Architectural Drawing is of Tunnel portal Section drawing. An irrigation canal or lateral is <strong>constructed to convey water from the source of supply to one or more farms</strong>. PRACTICE INFORMATION. The purpose of this practice is to deliver water to the farm irrigation system (s). Tunneling is <strong>a protocol that allows for the secure movement of data from one network to another</strong>. Tunneling involves allowing private network communications to be sent across a public network, such as the Internet, through a process called encapsulation. For more details and information download the drawing file.</p>