Tag Archives: water conservation

Jul 9 2012

Why didn’t the soil sensor want to party with the rain and rain/freeze sensors? BECAUSE THEY WERE ALL WET! Hahahaha…get it? All wet? Huh? Never mind….


I could have said “because he was well grounded and they were stuck up!” Would that have been any better? No?  Ok. I’ll stop.

Today’s controllers can do a number of things: multiple programs and start times, rain delays, soak cycles and more. They do it routinely, day in and day out, like nice little robots. But what happens if the conditions change? What if you don’t need more water? Tropical storm comes through and drops six inches of rain and your system is still running? What if your grandma is showing her favorite ice hockey moves on your frozen driveway? Need more ice?

Sensors are the answer. A sensor will turn your system off when there has been enough rain, or a freeze hits or if your soil just doesn’t need the water. This saves money on your water bill and, in the case of freezing, can prevent that lawsuit from when Grandma misses the goal and the puck flies across the ice into your neighbor’s window.

The simplest is the rain sensor. Easy to set, almost maintenance free. The rain sensor connects to your controller, either in a direct wire or wireless connection, and stops irrigation after a certain amount of rain has fallen. You mount it in an open area, such as the eaves of your house. You determine the amount of rain that causes the shut down, usually from 1/8” to 1”. To set the sensor you simply turn the top to the proper setting. That’s it. Rain comes down, sensor gets wet. When it gets wet enough it stops irrigation. Some rain sensors suspend irrigation immediately during rain events without need for rainfall accumulation. It rains, they stop.

Rain/freeze sensor. A rain/freeze sensor handles rain just like the standard rain sensor, either on accumulation or immediately upon rainfall. They add the advantage of shutting irrigation down before the water sprays and icicles and ice patches form on your yard and drive. The most common sensors stop activity when the temperature reaches about 37 degrees. Some models let you choose the shut off temperature, ranging from 35 to 45 degrees. The irrigation remains off until the temperature warms to above the freeze cut off settings. The rain/freeze sensor looks pretty much like a standard rain sensor.

The moisture sensor is a different kind of creature. The moisture sensor is buried in the ground, not up high. It doesn’t care if it rains or freezes. All it cares about is keeping the correct amount of water in the soil. If the soil has sufficient moisture it interrupts the irrigation cycle. Too much water in the soil can be just as harmful as too little. The moisture sensor aims for the proper range of moisture.  When the soil gets too dry it turns the cycle back on. With a direct read on soil moisture you don’t worry about wasting water through unnecessary irrigation.

With the proper sensors you can save water and money by watering only when needed. You also decrease liability by preventing icicles  and hazardous ice patches on the drive and walk.  The only downside is that Grandma might be upset you took her ice rink away.

May 7 2012

Drought? There ain’t no stinkin’ drought. Waiter! Two drops of water, please.


So let’s talk about money. Yours, mine, yours and yours. I do want to go over one water fact first. It’s a surprising fact to many people, even though it’s obvious. Fact: the Earth will never, ever run out of water. Ever. Never. Can’t happen until the Sun novas or the asteroid-to-end-all hits.

Great news, huh? Sure beats the ‘not enough water to water the crops’ and ‘not enough water to drink’ rants you hear all the time now.  Want water? We have water.

All you have to do is pay for it. And it’s going to get very, very expensive. Costs are going up. Eden Prairie, Minnesota: +7%; Clay Center, Kansas: +26%; Hershey, Pennsylvania: +14%; Sacramento, California: +27%.

Eyes glazed over yet? Mine did and I’m writing this. Don’t want to pay? Fine, go get the water. It’s in the ocean (remove salt and fish before use) or the nearest lake (long walk in Arizona) or deep underground. Start digging.

The problem is not the lack of water. It’s the lack of drinkable water in particular areas. Lots of it today in Houston, Texas.  Not so much in San Antonio, Texas.  Or parts of Kansas, Nebraska, Utah, etc. Getting water from one place to another costs lots of money. Lots. Whether you are pumping from underground (now discouraged), piping in from near or distant lakes, or pulling from a river, it’s expensive.

And it’s not just the drought that’s causing prices to increase. Sometimes you are just mussel bound. No, not the gym kind. Mussel. Like aquatic animal. Zebra Mussels have clogged up water pipes at numerous municipal water supplies. The Great Lakes has them. Lake Takoma in Texas has them. They are clogging the water supply lines and are expected to cost the US $5 billion in control efforts and reparation. How big is this monster? About the size of a dime.

What else is causing your water bill to go up? Surprisingly, the fact that we are using less water. Water districts have fixed costs/overhead, such as electricity, payroll, insurance, equipment, fuel, supplies, etc. All budgets are figured on a estimate of how much water is sold divided by overhead equals cost per gallon.  Gallons sold/fixed costs = cost per gallon.

Well, when you use less water (you meaning everyone as a whole), the quantity of gallons sold goes down. This means the district does not sell enough to cover its costs. It now has to raise the cost per gallon to match the fixed costs. So cost per gallon goes up and usually stays there.

Confused? Use the donut idea. Pretend you sell donuts for $.05 (5 cents) each and you clear $.01 per donut. Now say it costs you $1.00 to operate. You have to sell 100 donuts to break even. If Weight Watchers moves into your neighborhood and half your neighborhood joins, you can only sell 50 donuts. This means you only make $0.50.  That’s not $1.00 by a long shot. So you have to raise the price of each donut to $.06 to keep your $1.00  (ain’t finance fun!).

Water costs are going up. Conservation does help, as it means we need fewer pumps and less piping. But, as you can see, it’s not a cure. The reasons are varied and the drought is involved but it’s not the only thing.

That’s it. Not trying to sell anything, except possibly water conservation. Just trying to help you understand where your money is going and why.