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US Army Corps of Engineers Flood Proofing NATIONAL FLOOD PROOFING COMMITTEE National Nonstructural/ Flood Proofing Committee http://www.usace.army.mil/inet/functions/cw/cecwp/NFPC/nfpc.htm
Relocation Process Moving the Structure • Evacuate temporary roadway • Attach structure to trailer • Transport structure to new site
Relocation ProcessRestoration of Old Site • Plan must include a new use for the evacuated floodplain • Demolish and remove foundation and pavement • Disconnect and remove all utilities • Grading and site stabilization
Basic Formulation Strategy • The basic formulation strategy is to formulate to meet each of your planning objectives without violating any constraints. • Every iteration of the formulation step must employ this basic strategy.
How - Formulation Strategies • All possible combinations • Measures strategy • Convergent thinking • Divergent thinking
Nonstructural Opportunities New Uses of the Evacuated Flood Plain Ecosystem Restoration Recreation Spillover Benefits Water Quality Improvement E.O. 11988 NFIP Regulations Mitigation of Adverse Effects of Structural Projects
Mathematical models are used to evaluate the impacts of alternatives for flood damage reduction The Corps’ Flood Damage Assessment (FDA) model of expected annual damage estimation is the preferred method of modeling the effects of formulated plans Developed and Maintained at HEC – Specific training is available on the FDA model FDA Model Evaluates Measures
Formulation With FDA Model Channels Clearing & snagging Walls, levees Floodproofing Dams Detention reservoirs
Where do we begin in formulation? Detention pond? Channel Modification? Non-Structural Measures? High ground behind red line Town limits Levee/Wall?
First or Last? Detention pond High ground behind red line Levee
Dependencies • Flood damage reduction plans often comprise several measures • Some measures may require implementation of other measures in order to function properly: • Interior drainage measures (pump stations and/or ponding areas) with levees/floodwalls • Warning system, operations manual, or FWEEP when plans have closure structures requiring human intervention (put the sand bag in the slot, flip the switch on the gate motor power control, etc.)
Combinability • Flood damage reduction plans often comprise several increments • More often flood damage reduction plans have measures that can be combined in many ways, shapes, and sizes to achieve NED
Non-Structural $30M $40M $10M Pond $40M $20M -$20M Levees/Walls $60M $80M $20M Channel $100M $85M -$15M Initial Formulation (we have only just begun) Measure NED Cost NED Benefit Net NED Benefit
Increment Defined • An increment is any part of a plan that can be eliminated without jeopardizing the proper function of the remaining parts of the plan. • Thus, different levels of project performance are not increments. • WRDA 1986 Definition of Separable Element. “For purposes of this Act, the term "separable element" means a portion of a project-- (1) which is physically separable from other portions of the project; and (2) which-- (A) achieves hydrologic effects, or (B) produces physical or economic benefits, which are separately identifiable from those produced by other portions of the project.”
