Here is a picture of my backyard:
As you can see, I like to grow a few plants. And those plants need water.
During the last long weekend of July 4th, I decided to install a watering system for those plants.
When I looked at what was available at the hardware store, I saw two options: 1/4 in hoses and 1/2 in hoses. Not being too sure which one I should pick, I decided to do some simulation first.
To begin, I did a bit of googling to find out that the typical household pressure is usually between 40 and 60 PSI. Based on experience, I know that filling a 1 gallon watering container takes about 6 seconds, so I decided to simulate that first, to ensure my simulation was in the correct order of magnitude. Good news, it is:
The Real System
Having good confidence that my simulation would be realistic, I drew my setup using a series of Hydraulic Pipeline LP, where LP stands for Low Pressure.
On the house, that would look like the following, where I drew a yellow line for a main hose, and green lines for smaller sections going directly to each plant.
In each block, I specified the radius and length of each section:
Along with the elevation, to include the effect of gravity:
My first simulation with all the system made of 1/4 in pipes showed that I would get only 2.2 GPM of water coming out of the faucet... this means that it would take forever to water my plants, and that the last one farthest from the faucet would get no water.
To improve things, I thought about making the main line with a 1/2 in hose, and then tap into it using short 1/4 in hoses to reach each pot. This time, I got 10 GPM at the faucet, which is more acceptable. However, there was one problem. The first plant as receiving a lot more water than the last one.
To fix that, I will need to add adjustable nozzles to restrict the flow on the closest plants.
To simulate those, I added an orifice to the end of each hose. By leaving the last nozzle fully opened and making the orifices smaller as I was getting closer to the faucet, I could get a roughly equal flow rate on all nozzles, and keep the flow rate out of the faucet close to 10 GPM.
With confidence, I drove to the hardware store, bought everything I needed, installed the system, and now I can sit back and look at my plants being watered!
Now it's your turn
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