Drainage, Holes and Moderation

An edited version of this Insight first appeared in the ASHRAE Journal. Ever wonder how we can build a 50 story glass tower that doesn’t leak, but we can’t seem to build a two-story house that doesn’t leak? The answer is a little bit of counter intuitive thinking.

Ever wonder how we can build a 50 story glass tower that doesn’t leak, but we can’t seem to build a two-story house that doesn’t leak? The answer is a little bit of counter intuitive thinking.

We have learned to add holes and drainage in tall buildings in order for them to work. The lesson learned in tall buildings is that we can’t keep the rain out so we drain it out after it has entered. We can reduce the amount that enters but we can never completely keep it all out. Drainage and holes are key. These are regularly installed in tall buildings but not in short buildings. Until we add holes and drainage to small buildings they will continue to leak. This is so counter-intuitive that it borders on magic.

This story all begins with a cup in the rain (Figure 1). It is a plain ordinary cup, nothing magical about it yet. It is oriented parallel to the ground. Rain falls out of the sky due to something called gravity. The raindrops have momentum (“kinetic energy”) associated with them. There is no wind in this simple story of a cup in the rain so far. Sometimes the raindrops don’t fall completely straight down* and so they will occasionally fall into the cup. But lo and behold, even though some raindrops enter the cup the rainwater can drain out of the cup due to the slope of the cup with a little help from gravity. Drainage at work.

Figure 1: Cup in the Rain—Occasionally raindrops enter cup due to momentum and drain back to exterior via gravity and slope of cup. Did I mention drainage?

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Low Impact Living: Twelve Tips for Eco-Friendly Lawn Care

Editor’s note: While many will argue that there’s no such thing as an “eco-friendly lawn” (with justification), the grass covered yard is still a staple of most homes. Today, our friends at Low Impact Living have some tips for “greening” your lawn… while keeping it green. This post was originally published on May 7, 2008.

Summer is just around the corner, and this is the time of year when we really ramp up our lawn activities– watering, fertilizing, mowing, etc. And all of these can have major negative environmental consequences. Did you know that over 50 million Americans mow their lawns each weekend, and contribute as much as 5% of the country’s air pollution? And it’s staggering to realize that the average American grassy lawn can use over 20,000 gallons of water each summer! So, a major part of any green home strategy should be to embrace eco-friendly lawn and garden care.

Here are 12 ways you can make sure you have an eco-friendly lawn this summer

1. Collect rain water and use it for your plants. Getting a rain barrel or two for your yard is a simple way to collect and reuse Mother Nature’s water. Just put it under your gutter’s down spout and you’ll be amazed how fast it fills up. Click here for rain barrels.

2. Make sure you’re not over-watering. Most of us over-water our lawns. Do you have moss growing on your driveway or sidewalk or in your garden? That’s a sign you’re watering too much. Do you have pools of standing water anywhere? Another sign. You can buy a very inexpensive lawn moisture meter that will tell you if you’re over-watering. You might also consider getting an intelligent irrigation control system that attunes your watering to the weather and your lawn’s needs.

3. Don’t hose down your sidewalks and driveway. That water is a valuable resource and the water you send into the gutter is carrying oil and a host of chemicals out as run-off that go on to pollute our rivers, lakes and oceans.

4. Get a push mower for your lawn. Traditional gas mowers are horrible for our air quality and contribute to global warming. They are major environmental offenders. A good-ole push mower is the eco-friendly solution. (Or if you can’t go all the way to push style, get a plug-in electric model– better than gas.) Find mowers here.

5. Say no to leaf-blowers! The gas-powered leaf blowers some people use are major carbon emissions culprits. Say yes to a broom! Your waist-line will thank you too.

6. And when you’re done mowing, leave your clippings on your yard. Those grass clippings make great mulch and will help you save water as well.

7. Be sure to compost your other yard waste. If your city doesn’t collect green waste for composting, please get a composter and do it yourself. It’s super easy and the composter will turn your waste into great mulch for use throughout your yard and garden. Find composters here.

8. Embrace native plants. Plants, flowers and grasses that are native to your region are the most atuned to soil, climate and water particularities. They are great water savers and will thrive with less care than tropical and other imported varieties. And they are gorgeous! Learn more about native landscaping here with our book collection. Or contact a green professional landscape designer or maintainance provider from our green services directory. We have eco-minded landscaping experts listed across the United States.

9. Are you addicted to the look of grass but live in a high-drought area? You may want to consider synthetic grass. It uses no water, lasts over ten years, and looks & feels surprisingly real. Learn more about synthetic grass here.

10. Why not start your own organic food garden? Nothing could be better for the planet or your health. Learn how to get started with organic veggies here.

11. Use non-toxic fertilizers and pest-control agents for your garden and lawn. Not only are these better for your plants (particularly any food you might eat), they reduce the amount of toxins that run-off into our waterways. Find safe alternatives here.

12. Use solar or LED lighting in your lawn. Solar lighting is obviously an energy-saver. If you don’t find solar lights bright enough, check out LED lights—they are very bright and use very little power. They will last 5-10 times as long as standard outdoor lights. Find energy-efficient lighting options here.