Sustainable Sites (LEED SS Category)

As I mentioned before, our lot is what sold the original house – we love it.  It’s about .4 acres and very deep (about 250 feet deep).  LEED awards points for taking care of the land and preparing it to be water-wise and safe.  Here’s how the points worked for us:

We’re required to do basic erosion control during construction.  We investigated using burlap and shredded wood, but were told that the City of Dallas inspectors didn’t like that method, so we went with traditional plastic with wooden stakes.  We weren’t thrilled, but given the fits the inspectors had already given us during the foundation phase of the project we decided not to tempt fate further.

There are several points for basic landscaping design and techniques.  We have a landscape architect, Jim Martinez, engaged in the project who has a ton of experience with drought-friendly yards.   He was able to design the yard using native and adapted plants.  The LEED calculation lead us to expect a 66% reduction in irrigation demand, and that gave us a whopping 6 points.  That’s a lot in LEED-speak!  We left one point on the table – a point that would have required us to remove a large privet hedge.  I know some folks would pay money to get rid of their privets, but these had been on this property for more than 50 years.  They house the breeding site for our lightening bugs, provide cover for birds and other wildlife, and provide a year-round noise cushion between us, the neighbor’s pool, and Love Field traffic.  We just couldn’t bring ourselves to rip them out. 

French Drain installation

Other points can be earned by managing surface water.  Here are some of the design features we used to avoid as much stormwater runoff as possible:

  • Rainwater falling on 100% of our roof will be directed into two 2500 gallon cisterns to be used for irrigation and clothes washing.  I’ll talk more about this feature in a later post…we’re very excited about it!
  • Swales (or berms) in the back and front yard to create rainwater gardens that will capture and hold rainwater while it soaks into the ground.
  • French drains (being installed in the photo above) to direct water from the uphill side of the property around the structures and into the swales.  
  • Driveway runners versus a full concrete driveway – we’re creating concrete ribbons for our front yard drive with grass growing in between.  These look a bit old-fashioned, but they create a space for more rainwater percolation versus the rainwater running into the street.
  • Permiable driveway in the back of the house – it will be gravel so rainwater will soak directly into the ground versus running off of a concrete drive.
  • Patios made of poured concrete pads with space between them (versus solid slabs) to allow rainwater to run between them and soak into the ground
  • A lot of trees and bushes being added into the landscape to hold the dirt and reduce natural erosion

Other points we’re getting are for using non-toxic pest controls – things like making sure you don’t plant new plants within 24″ of the structures (we actually have a 24-36″ band of gravel around the structures, so no plants will be planted close to the house or garage) and sealing all openings with calk or wire mesh. 

We didn’t earn points for “Compact Development”.  The denser the population the less impact on Mother Nature, so LEED provides credit for denser developments.  Because we live in an area with lot sizes from .25 to 1.25 acres we were just out of luck.  To be eligible for points, you’re required to have a maximum lot size equivalent of 1/7 of an acre (and the smaller the better)….oh well!

Expected Sustainable Sites points:  16 out of a possible 22.

01
alnhouston
September 5th, 2008 9:04 am

what was the reason the city of dallas didn’t want you to use wood chips and burlap? if the result is the same…
i wish more homeowners/builders/developers would consider pouring driveways and patios the same way that you all are, it is much more attractive. Is it more cost effective to pour a one huge slab of concrete?

02
September 5th, 2008 9:33 am

Apparently they’re just not used to dealing with it. And what we learned is that they tend to be comfortable with one way of doing things…and not much beyond that. We needed to move quickly and didn’t have the time to work through the difference with the City. I think our use of rainwater harvesting for the water into the washing machine is also a first-time for Dallas, so our Rainwater Harvesting company is going to have to get it specially approved by the City…we’ll see how that works out!

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