Working with Dam Owners to Implement Virginia's Special Criteria Reduction for High Hazard Dams

David P. Wilmoth, PE, CFM, PH, Water Resources Engineering Project Manager, Hurt & Proffitt, Inc.

In December of 2010, the Virginia DCR Dam Safety Regulations were amended adding section 4VAC50-20-53 allowing High Hazard Dams to reduce their required Spillway Design Flood (SDF) storm event from the 0.9 PMP to the 0.6 PMP by adhering to multiple additional special criteria.  Since 2010, Hurt & Proffitt, Inc. has assisted Virginia Dam Owners in successfully implementing Section 4VAC50-20-53 through DCR Dam Safety approval.

This presentation will explore the details of Section 4VAC50-20-53 Special Criteria for Reduced SDF Requirement for Certain High Hazard Dams and provide conference attendees with knowledge on the steps Hurt & Proffitt utilized to obtain DCR approval.  This presentation will also discuss the differences between the Regulations and Law sections of the reduced SDF option, challenges for the Dam Owner’s, and lessons learned.

Author Bio

Mr. Wilmoth has served as an Engineering Project Manager with Hurt & Proffitt, Inc. in Richmond, VA for over a year within the Water Resources section. Mr. Wilmoth is a graduate of Virginia Polytechnic Institute & State University with a bachelor’s degree in Civil Engineering with concentrations in Hydrosystems / Green Engineering. Mr. Wilmoth is a licensed Professional Engineer in Virginia & North Carolina, a Certified Floodplain Manager as recognized through the Association of State Floodplain Managers (ASFPM), and a Professional Hydrologist as recognized through the American Institute of Hydrology (AIH). Mr. Wilmoth has over 17 years of experience in engineering design in the areas of residential & commercial development, municipal, government, private business, utilities, & environmental. Mr. Wilmoth specializes in the engineering analysis & design of earthen dams, dam failure analysis modeling, hydrology & hydraulics, floodplain mgmt., DSIS, & stormwater management facilities.