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Final Discovery Report Final Discovery Report (DRAFT) Río Grande de Loíza Watershed, HUC10 2101000504 Municipalities of Aguas Buenas, Caguas, Canóvanas, Carolina 1, Gurabo, Juncos, Las Piedras, Loíza, San Lorenzo, and Trujillo Alto, Commonwealth of Puerto Rico September 2017 1 Separate NFIP Community Table of Contents Table of Contents ................................................................................................................... i List of Acronyms .................................................................................................................... v Executive Summary ............................................................................................................... 1 1. Discovery Overview ......................................................................................................... 3 1.1 Discovery Objectives ........................................................................................................ 4 1.2 Discovery Process ............................................................................................................ 4 1.3 Discovery Outputs ............................................................................................................ 5 2. Watershed Overview ....................................................................................................... 6 2.1 Geography ........................................................................................................................ 6 2.2 Land Use: Classification and Zoning ................................................................................. 8 2.3 Demographics ................................................................................................................ 12 2.3.1 Population .......................................................................................................... 12 2.3.2 Government/Representatives ........................................................................... 12 2.4 Economy ......................................................................................................................... 14 2.5 Historic Flooding Problems ............................................................................................ 18 2.5.1 Types of Flooding ............................................................................................... 18 2.5.2 Historic Flood Events ......................................................................................... 19 2.5.3 Disaster Declarations ......................................................................................... 20 2.5.4 High Water Marks .............................................................................................. 22 2.5.5 Flood Protection Measures ................................................................................ 22 3. Discovery Outreach and Engagement Strategy ............................................................... 24 3.1 Stakeholder Identification ............................................................................................. 24 3.1.1 Key Stakeholder Groups and Influences ............................................................ 24 3.2 Pre-Discovery Meeting Engagement and Information Exchange .................................. 25 3.2.1 Discovery Kickoff Meeting ................................................................................. 25 3.2.2 Discovery Data Questionnaire ........................................................................... 25 3.2.3 Draft Discovery Report and Maps ...................................................................... 26 4. Summary of Watershed-Wide Data ................................................................................ 27 4.1 NFIP Data ....................................................................................................................... 29 Discovery Report: Río Grande de Loíza Watershed i 4.1.1 Effective FIRMs .................................................................................................. 29 4.1.2 LOMCs ................................................................................................................ 32 4.1.3 CNMS .................................................................................................................. 34 4.1.4 Flood Insurance Policies ..................................................................................... 39 4.1.5 NFIP Claims ........................................................................................................ 39 4.1.6 Repetitive Losses ................................................................................................ 40 4.1.7 CAVs ................................................................................................................... 41 4.1.8 CACs ................................................................................................................... 41 4.1.9 CRS ..................................................................................................................... 41 4.2 Other Data Useful for Flood Risk Assessment and Mitigation ...................................... 42 4.2.1 LiDAR/Topographic Coverage ............................................................................ 42 4.2.2 Dams .................................................................................................................. 42 4.2.3 Levees ................................................................................................................ 43 4.2.4 Coastal Barrier Resources System ..................................................................... 43 4.2.5 Stream Gages ..................................................................................................... 44 4.2.6 USGS Streamflows and Watershed Characteristics ........................................... 46 4.2.7 Average Annualized Loss Data ........................................................................... 47 4.2.8 Land Use Management Plans ............................................................................ 48 4.2.9 Stormwater Projects .......................................................................................... 48 4.2.10 Transportation ................................................................................................... 49 4.2.11 Jurisdictional Boundaries ................................................................................... 49 4.3 Hazard Mitigation Planning and Activities ..................................................................... 50 4.3.1 Summary of Hazard Mitigation Plans ................................................................ 50 4.3.2 Critical Facilities and Other Important Properties in SFHA ............................... 51 4.3.3 Hazard Mitigation Grants ................................................................................... 51 4.3.4 Mitigation Projects Completed or Underway .................................................... 52 4.4 Other Data Received from Stakeholders ....................................................................... 55 5. Discovery Meetings ........................................................................................................ 56 6. Discovery Process Findings ............................................................................................. 57 6.1 Discovery Maps .............................................................................................................. 57 6.2 Summary of Stakeholder Comments about Flood Study Needs ................................... 58 Discovery Report: Río Grande de Loíza Watershed ii 6.3 Recommendations for Future Risk MAP Project Scope ................................................. 61 6.3.1 Study Types ........................................................................................................ 68 6.3.2 Future Risk MAP Products ................................................................................. 68 6.3.3 Finalizing Discovery ............................................................................................ 69 7. References ..................................................................................................................... 70 Tables Table 1: Population of Municipalities in the Watershed .............................................................. 12 Table 2: Government Representatives of Puerto Rico (as of March 2017) .................................. 14 Table 3: Municipality Representatives of Puerto Rico (as of March 2017) .................................. 14 Table 4: Industry by Occupation for Employed Population Aged 16 or Over .............................. 16 Table 5: Disaster Declarations in the Commonwealth of Puerto Rico ......................................... 20 Table 6: USGS High Water Marks for Hurricane Hugo 1989......................................................... 22 Table 7: Data Collection for Río Grande de Loíza Watershed ...................................................... 28 Table 8: Flooding Sources in the Watershed Studied by Detailed Methods ................................ 30 Table 9: Population Affected by the Hazard of Flooding .............................................................. 31 Table 10: LOMCs within the Río Grande de Loíza Watershed ...................................................... 32 Table 11: CNMS Mileage for Río Grande de Loíza Watershed ..................................................... 37 Table 12: NFIP Flood Insurance Policies
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