Since this project is all about watering the lawn, I thought it would be a good idea to see how well a gravity fed system would work. In order to perform a truly empirical test, I decided to test the water flow independent of the bot. I plumbed the storage container (i.e. plastic storage bin) to the valve, that will be driven by a relay in the final bot construction, to the sprinkler t-bar. I was surprised that the pressure and flow with a full tank of water was almost identical to the last inch of water. While the tank was draining I started a timer to determine how much of the lawn could be covered within 'x' amount of time. It drained 40 gallons in about 40 minutes, so around 1 gallon in a minute. Of course, I don't know how fast the bot can move so the coverage is still an incalculable value but were getting closer.

Here is a video of the water flow :