International Guidelines on Natural and Nature-Based Features for Flood Risk Management

assets where more natural forms of NNBF from other chapters are not possible) throughout the design life. Many of these “during design life” enhancements can be simple, inexpensive changes to conventional practice that incorporate features presented in Table 14.1. Whether the infrastructure is new build, replacement, retrofit, repair, or altered maintenance practice, each enhancement of it should be placed in contextually relevant locations and should not interfere with the engineering function, operation, or maintenance of the structural measure (hereafter, engineering function). For example, for many reinforced seawalls, engineering requirements for concrete cover (e.g., between 70 and 100 millimeters) and allowable defect tolerances during construction can limit the size of enhancements, limiting the range of ecological design options that are allowable. Figure 14.8. Activities Associated with Enhancing Existing Conventional Infrastructure Following the NNBF Framework New Project Conventional Design and Build

NNBF Design and Build* Green Gray Construction Complete

Decommission

Monitor and Inspect

Replace

To Do List: ~Make Figure Taller ~Make Icon for NNBF ~Add Legend ~Construction Complete Banner

100% 0% Repair 75%

Retroﬁt

Entry point to add NNBF

NNBF can be added to any point of an asset’s life cycle.

Existing Asset Life Cycle

50%

Routine Asset Maintenance 25%

Asset Performance

(engineering + ecological)

Asset Prioritize

(management actions)

*See Figure 2.3 from Chapter 2 for full ﬁgure

Note: NNBF enhancement opportunities exist at various phases of a project, including at the design and build, maintenance, and repair phases, with both new and existing assets.

14 | Enhancing Structural Measures for Environmental, Social, and Engineering Benefits

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International Guidelines on Natural and Nature-Based Features for Flood Risk Management

Published on Sep 16, 2021

US Army Engineer Research and Development Center

International Guidelines on Natural and Nature-Based Features for Flood Risk Management (NNBF Guidelines) is the product of a large-scale collaboration that included 5 years of working-level meetings and knowledge sharing involving key practice leaders from around the world. The project was initiated and led by the U.S. Army Corps of Engineers (USACE) as a part of its Engineering With Nature Initiative. USACE in the United States, the Rijkswaterstaat Ministry of Infrastructure and Water Management in the Netherlands, and the Environment Agency in the United Kingdom were the three primary government institutions that organized and led the effort. Many other organizations also provided critical leadership and participation, including the National Oceanic and Atmospheric Administration, World Bank, National Institute of Standards and Technology, The Nature Conservancy, and the World Wildlife Fund.