Project Management Case Studies

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The Effects of Submerged Aquatic Vegetation on Flow in Irrigation Canals


It has long been known that vegetation in flowing channels has significant impacts on the flow regime. Invasive aquatic species such as Hydrilla verticillata have become a pervasive and nearly ineradicable part of waterways in the American south. In addition efforts to design flowing wetlands—both as treatment systems and as mitigation for damaged or destroyed natural systems—have been hampered by a lack of pertinent design methods.

Southworth Design Report


Mr. Demich has worked extensively with the Federal Emergency Management Agency (FEMA) over the last seven years, assisting with disaster recovery and planning efforts in Texas after Hurricane Ike, in Louisiana after Hurricanes Katrina, Rita, Gustav and Ike and in New York after Hurricanes Irene and Sandy. He has also worked in disaster recovery in Utah and California. He is well versed in the regulations and policies that govern FEMA’s funding of coastal and upland restoration projects and has recently completed documenting Louisiana’s claim for barrier island restoration.

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