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Smart Watering
By Emily Vignapiano
4/17/10




There was an experiment that was VERY similar to mine. It was done in 2005. It was about efficient lawn watering. It was a two-month experiment done by Richard Himmel at Colorado State University. The outcome was that only 2 participant’s water usage went down and the other 5 went up a LOT!!!!! The average increase was 7,140 gallons.

My project is about watering the grass. In the research I did, I found out a lot of things. I found out that there is an equation for the amount of soil moisture. It is θ = nS. The symbol θ means water content. The symbol n means porosity. The symbol S means saturation.

I also learned that timing for the watering cycles is very important. If you water when the soil is very wet, then the additional water is thereby wasted. If you water when the soil looks dry, it might still be wet underneath. If that’s the case, then the additional water is wasted. If not, the water will not be wasted unless it goes below the root level. Basically, any water that goes below the root level is wasted.

I learned that if the grass has too little water, then the grass will die. If it has too much water, it might die.

I also learned how to measure soil moisture. You measure soil moisture by using a soil moisture sensor. A soil moisture sensor tells you when it’s time to water. You can also measure soil moisture using a soil probe. That gives you a core sample. If the sample is dry, you need to water. If it’s wet, then you don’t. Either way, you still get accurate results.

Hydrology is the study of earth’s water. Ecology is the stuff that happens with organisms and their environment. Ecohydrology is a combined science of hydrology and ecology. The ecohydrological theory is a theory that says things about hydrology and ecohydrology like space and time issues.

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