Apocalyptic Erosion Control: Sustainable Soil Strategies under El Niño and Drought Conditions

Date / Time:
Tuesday, Sep 13 4:20pm to 4:50pm
Location:
Sunset V
Track / Session:
Construction General Permit / New Approaches to CGP Compliance
Description/Abstract: 

The contradictions inherent in two extreme climatic conditions – drought and El Niño - exacerbate soil erosion and water quality issues. El Niño conditions generally result in above-average rainfall, increased risk of erosion but also greater vegetative growth. In droughty conditions, this increase in biomass can result in more intense burns of dormant or dead vegetation and thereby accelerated erosion due to changes in the physical, chemical and biological properties of soil. Research has shown that as burn intensity increases, so does the time that it takes for a watershed to recover its normal hydrologic function. As a result - with population growth and expansion of communities into the urban interface - the risk of flooding and air quality impacts that affect human health and safety, as well as community infrastructure, may be prolonged for many years following the incidence of wildfires of high burn intensity.

So it appears that the confluence of drought and El Niño are wildfires, which increase soil erosion and accelerate erosion and flooding. But in general construction activities, the need for soil stewardship - and the erosion control best management practices that support it - is even more important during times of drought and above-average precipitation. During drought, how do we achieve final stabilization under the Construction General Permit? Conversely, how do we strengthen our erosion and sediment control plans in anticipation of El Niño precipitation? The author will provide examples of sustainable strategies – and their implementation – under field conditions of drought, El Niño and wildfires.

The takeaway message of this presentation is that while there are some differences associated with preparing for and remediating the water and air quality impacts of climatic extremes, storm water pollution prevention strategies need include long term planning for sustainable solutions to soil erosion.

Primary Speaker:
MIchael Harding, Consultant
Michael V. Harding is a Consultant in San Diego, CA. He is one of the leading technical experts in the field of erosion and sediment control. A graduate from Purdue University, Michael has over forty years of experience in nonpoint source pollution control both in the United States and overseas. Michael designed and supervised the construction of the San Diego State University Soil Erosion Research Laboratory and was its Director from 1999-2002. Michael is a three-time past president of the International Erosion Control Association (IECA) and Chief of Council for the IECA’s International Regional Council.