Addressing Flooding Issues in Guam: 2020 Findings and Recommendations

Detailed findings from Guam's public agencies highlight major gaps in addressing flooding, such as lacking subdivision drainage requirements, minimal development standards for homeowners, and insufficient post-construction problem mitigation. Recommendations include density restrictions, low impact development standards, and policy changes to enhance flood control efforts.

• Guam
• Flooding
• Public Agencies
• Recommendations
• Infrastructure

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Uploaded on Jul 17, 2024 | 1 Views

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1. Flooding Flooding Recap of 2020 findings Recap of 2020 findings Guam Department of Public Works Guam Environmental Protection Agency Guam Department of Land Management

2. Assembly of Planners 2020

4. Assembly of Planners 2020

5. A typical scenario A typical scenario

6. Unplanned development and flooding Assembly of Planners 2020

7. Summary: Major gaps Subdivision drainage requirements do not apply to piecemeal parceling Minimal development requirements for individual homeowners Little to no ability to address post- construction problems Flooding not explicitly addressed by any agency Assembly of Planners 2020

8. Recommendations Requirements for developers: Density restrictions for development without infrastructure Impermeable area limits Low impact development (LID) standards for homes Design standards for fences/walls Changes to review process: Use of mapping tools in permitting process DPW drainage review for every lot Policy Changes: Clearly designate lead flood control agency Change rules to require maintenance and retroactive installation Funding Establish Stormwater Utility w/ funding mechanisms for maintenance, capital investment Assembly of Planners 2020

9. Development density Conditional based on infrastructure For example, max density of 1 home per acre unless: Drainage infrastructure provided Sewer infrastructure provided Assembly of Planners 2020

10. Residential LID (low impact development) Source: 2006 CNMI & Guam Stormwater Management Manual Assembly of Planners 2020

11. Assembly of Planners 2020