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Floodplain and Drainage Ordinance Floodplain and Drainage

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					Floodplain and Drainage Ordinance
        Recommendations
                  13
       December 13, 2010
   Provide Recommendations for Floodplain and Local Drainage
    Issues
    ◦ On Going Process Working with City Staff
    ◦ Review of Other Agency Ordinances/Criteria
         City of Piney Point
         City of Bellaire
         Harris County
         City of Houston

              ,           y                p
    November 15, 2010 - City Council Workshop

   December 2010 – Draft of Ordinance Recommendation Report
    (with Project Narrative and Additional Technical References)

   Focused Primarily on:
    ◦ Article IX – Storm Drainage and Flood Control
    ◦ Article XXI – Stormwater Management
Four Areas of Concern:
1. Resolve Runoff Issues Resulting From
   R    l R      ff I     R   lti  F
   Conflicting Floodplain & Drainage Requirements

2.   Develop Alternatives to Meet Requirements

3.
3    Ensure Compatibility of Recommendations
     Across Ordinances and Building Codes

4.   Address Construction Phase Drainage Patterns
     to Avoid Flooding Concerns
1.   Resolve Runoff Issues Resulting From Conflicting
                           Requirements
     Floodplain & Drainage Req irements
        Section 14-221 (d) (1) – Construction Documents
            All plans shall be submitted together to ensure
             compatibility
            Additional information on plans to ensure requirements
             are being met
                 25’x25’ Topographic Grid
                 Benchmark Elevations
                 As-Built Requirements Prior to Certificate of Occupancy
        Section 14-222 – General Provisions
                 14 222
            18” Freeboard Above Base Flood Elevation
            Elevation Certificate Requirements
1.   Resolve Runoff Issues Resulting From Conflicting
                           Requirements
     Floodplain & Drainage Req irements
        Section 14-223 – Design Criteria
            Flows Shall be Contained within Property
                Swales (Does Not Include French Drains)
                Area Drains
                Shared Flow Requirements (Recorded Agreement Filed with
                               Clerk s
                 Harris County Clerk’s Office)
            Clarification on Residential Design Criteria (3-Year
             Storm)
1.   Resolve Runoff Issues Resulting From Conflicting
                           Requirements
     Floodplain & Drainage Req irements
        Section 14-225 – Flood Damage Prevention
            Reference to Permit Requirements (Section 404 and
             Endangered Species Act of 1973)
            NO NET FILL ALLOWED
            18” Freeboard above Base Flood Elevation and TSARP
             B    h    k Datum
             Benchmark D t
            Building Code Requirements: Grades Sloping Away from
             Foundations
            Elevation Certificates
            Substantial Improvements
            Substantial Damage
            FEMA Requirements for Construction
2.   Develop Alternatives to Meet Requirements
        Section 14-225 (h) – Flood Damage Prevention
            Reference to FEMA Technical Bulletins 1-93, 2-93, 3-93
             (Provided in Project Narrative)
            Pier and Beam Construction
            Stem Wall Construction
            Attached or Detached Garage Construction and
             Elevations
             El    ti
            Guidance on Flood Resistant Materials to Use
3.   Ensure Compatibility of Recommendations
     Across Ordinances and Building Codes
     A      O di          d B ildi  C d
        18” Freeboard Requirements Above Base Flood
         Elevation
        No Fill Requirements
        Elevation Certificate Requirements
        International Residential Code Grading Requirements
4.   Address Construction Phase Drainage
     Patterns to Avoid Flooding Concerns
     P           A id Fl di     C
        Article XXI – Storm Water Management
        Compliance with Article IX Provides a First Step
        Section 14-674 – Erosion and Sediment Control Plan
            Temporary Drainage Plan Requirements
            Compatibility with Overall Plan Set
            Designation for Stockpiles, Borrow Areas, Grading Limits
            Additional Inspection Requirements
Additional Recommendations
     Update Ordinance to Match HCFCD Criteria
         10-Year & 100-Year Evaluations
         Limits to Drainage Area Size for Evaluations
         HCFCD Criteria References
     General Hydrologic and Hydraulic Requirements
         Time of Concentration
         Hydrologic Calculation Methodology
     General “Clean Up” of Ordinance Text
Thank You

				
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