October 4, 2013

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Lisa Austin and Judd Goodman Share Step-by-Step Approach for Predicting Hydromodification Impacts

OAKLAND, Ca. — Lisa Austin, PE, and Judd Goodman, PE, were recently selected to present their technical paper, "Predicting Hydromodification Impacts Using a Four Factor Approach," at the 2011 World Environmental & Water Resources Congress in Palm Springs, Ca., on May 22-26, 2011.

Hydromodification is defined as changes in runoff characteristics and in-stream processes caused by land use alteration. Unless managed, hydromodification can cause excessive stream channel erosion, sedimentation, planform migration, changes in bed material composition, or alteration to baseflow. Such geomorphic impacts may be associated with impairment of natural habitat, beneficial uses, and instability of stream conditions.

Lisa and Judd will share a step-by-step approach for predicting hydromodification impacts which includes: properly characterizing the four primary factors controlling channel adjustment for both the pre- and post-disturbance condition; incorporating these characterizations as inputs to a long-term continuous sediment transport model; and predicting the likelihood of channel form adjustment based on the ratio of sediment transport capacity and sediment supply in the pre- and post-disturbance conditions.

Lisa is based in Geosyntec's Oakland, Ca., office. She has 20 years of experience in water quality and stormwater management. Lisa has in-depth knowledge of both industrial and municipal National Pollutant Discharge Elimination System (NPDES) permitting; municipal stormwater program planning and operations; stormwater best management practice (BMP) selection, design, and maintenance; and construction erosion control. She received her BS in environmental engineering and her MS in civil engineering from Southern Illinois University in Carbondale, Ill.

Judd, also based in Oakland, has several years of experience in the planning and design of water infrastructure. While at Geosyntec, he has focused on implementing surface water and stream improvements from both an engineering and geomorphic perspective. Judd has been involved in a variety of projects, including hydromodification planning and impact analysis, geomorphic field assessment, design of stormwater management systems for landfills, water quality monitoring, erosion and sediment control inspection at construction sites, and storm event characterization for litigation support. He received his MS in environmental engineering and BS in civil engineering from the University of California, Berkeley.