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Golden Compost
Texas Roadside Composting
EPA530-F-03-031
July 2003
Texas Department of Transportation (TxDOT) thinks compost is worth its
weight in gold. TxDOT runs one of the most advanced, widespread compost-use
programs in the United States and has conducted more than 20 demonstrations
across the state proving the benefits of compost.
Like many states, Texas used to struggle with roadside erosion. Erosion
of roads is generally caused by rain water flowing near the paved surfaces.
This problem can be prevented by surrounding the pavement with vegetation,
but if vegetation does not take root immediately after road construction,
the soil will wash away and plant growth will become extremely difficult.
Repeated attempts at revegetation are timely, costly, and often don't
work due to poor soil conditions.
Thanks to a partnership with Texas Natural Resources Conservation Commission
(TNRCC), TxDOT found that compost helps prevent the erosion of roads by
helping vegetation grow quickly. Because compost also has the ability
to absorb large amounts of water, TxDOT has experienced a reduction in
surface runoff and soil loss and increased rates of percolation. Using
compost saves the state money through lowered construction expenditures
and avoided future erosion maintenance.
TNRCC and TxDOT took their knowledge on the road, demonstrating compost's
benefits on problem areas throughout Texas. Support from Texas districts
has been overwhelming; municipalities have dubbed compost production a
viable alternative to landfilling garbage and a solution for roadside
erosion. Compost is currently being used in more than half of TxDOT districts.
An example of TxDOT's success with compost can be seen along State Highway
108. Two years after this road was built, vegetation was sparse on the
surrounding lands, leading to high levels of runoff and potential erosion
of the highway. TxDOT conducted an experiment on this area by treating
one side of the road with 500 cubic yards of manure compost while leaving
the other side untreated. What resulted was considerably stronger seed
germination on the compost-amended side of road.
An even larger success for TxDOT is the IH 20 in Big Spring, Texas. Here,
a badly eroded hillside laid barren for nearly 30 years through multiple
unsuccessful attempts at seeding, hydromulching, and blanketing. The department
realized it was time to bring in the compost. The slope was treated with
composted feedlot manure and cotton burrs. TxDOT also applied wood chips
to weigh down the lightweight material. Not only did this compost remain
through 40 mile per hour winds on the day of application and resist a
heavy rainfall shortly after application, but 2 months later, the site
was heavily vegetated by a healthy, stable grass community.
Every year, nearly 4 million tons of yard trimmings are dumped into landfills
in Texas. The state now gives its districts up to a 20 percent discount
on state waste tipping fees if they ban brush from their local landfills.
This step not only saves landfill space, but allows for the creation of
more compost. TxDOT has drafted various specifications for compost, allowing
the state to purchase close to 300,000 cubic yards of this material for
roadside projects.
As for the future, TxDOT has committed to using more compost for roadside
vegetation and erosion control projects. TxDOT and TNRCC have given demonstrations
of the benefits of roadside compost in 23 of Texas's 25 districts. They
plan to visit the remaining two districts within the coming year, as well
as begin educating contractors on how to effectively apply compost.
For information of TxDOT's compost specifications, check out the TxDOT
Web site
.
View and print this fact sheet (PDF) (2 pp, 99K, About PDF)
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