...and Tom LaBonge told anyone who would listen that hydromulch doesn't work.
Silly man. From yesterday's Daily Journal of Commerce (Oregon) with a wicked-cool photo:
Burn recovery: Griffith Park gains hope for future
POSTED: Wednesday, January 13, 2010 at 05:03 PM PT
BY: DJC Staff
In May 2007, fire raged through Griffith Park in Los Angeles,
destroying more than 840 acres of vegetation and leaving behind large
stretches of exposed, charred soil. As the rainy season neared, residents began to worry the bare areas, when hit by heavy rains, would give rise to dangerous landslides and mudflows that would spill into residential areas. City officials were
worried, too. They knew that burned soil areas often have high rates of
runoff in the first seasons following wildfires. The burned areas in
Griffith Park were ripe for such a situation.
The city turned to Kleinfelder for help. Working in a consultant
capacity, Kleinfelder was handed the task of not only assessing the
potential for erosion in burn areas, but also of coming up with ideas
to secure and mitigate the burn sites. Kleinfelder began by conducting a site assessment of the often steep terrain of the park. Then the firm’s scientists began collecting data, taking soil and topographic samples that allowed them to evaluate the potential for erosion of the area that had been burned in the wildfires. Working on an aggressive schedule, Kleinfelder combined erosion
modeling results with infrastructure assessments. By adding information
about topographical features, Kleinfelder and a city team developed a
plan for applying hydromulch to the burned areas to secure the soil.
The extreme hill slopes in some areas required two different hydromulch
formulations. Depth of the applications also varied based on topography. The affected areas survived the rainy season without significant
soil movement, but Kleinfelder’s work also had long-term impacts. The
accuracy of the hydromulch applications created positive conditions
that attributed to the long-term recovery of native plants in the park.
In addition, the techniques Kleinfelder developed while working on the
Griffith Park burn sites not only prevented soil from washing away
during winter rains, but also are expected to be able to benefit other
communities trying to reduce or prevent areas damaged by wildfires.