This can be done using overhead transpariences, a field trip to see an actual garden with trickle irrigation, or showing the actual irrigation components during your talk. People have come to expect visuals . Today's world is very visual compared to just a few decades ago. The average person is visually oriented and accustomed to visual presentations. Thus, a strictly oral presentation is boring to the majority of the people.
Visual aids help establish organization for presentations .
One of the most effective uses of visual aids is establishing overall organization for the presentation. Audiences look for order in everything they experience. Organization aids comprehension and retention. If the structure of a presentation is shown at the beginning of a presentation, a cognitive framework is established for what is to come. If the visuals outlining the presentation are used throughout the program, it will also aid in organizing the new material as it is presented.