DRAINAGE DESIGN
THAT MAKES SENSE
June 13, 2017
DRAINAGE INITIATIVE
PROPOSED REVISIONS TO THE
CODE OF ORDINANCES
Calcasieu Parish Police Jury
Parishwide Drainage Liaison Committee
PARISHWIDE DRAINAGE MANAGEMENT
Calcasieu Drainage Coalition
Policies and Ordinances
DEVELOPMENT
Standards for development and
maintenance – parish and cities
should be similar
ENFORCEMENT
Appropriate departments at
Police Jury and cities; GDDs
DRAINAGE DESIGN THAT MAKES SENSE
Capital Improvement
Program (CIP)
Police Jury takes lead role,
solicits input from cities and
drainage districts prior to
program development
Functions as a three-year
revolving program – updated
annually – utilizing sound criteria
for prioritization
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OUTREACH & ENGAGEMENT
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Stakeholder Focus Groups (total of 20
working sessions)
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as multiple CPPJ Drainage Committee
meetings throughout the effort (250+
attendees)
Drainage Coalition meetings
Municipalities, gravity drainage districts
Engineers and planners
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Landowners
– Represents all municipalities and
drainage districts
Developers, realtors, banking, &
insurance
– Engaged regularly since November to
develop, refine, and establish final draft
Architects
of ordinances
GO Group task forces and
• 2 public comment periods, 138 public
subcommittees
comments
Business and industry
Mayors and City Council
• Stakeholder comment period for
representatives
draft ordinances, 8 responses in
Public Open Houses held in Lake
Charles, Sulphur, Moss Bluff, as well
DRAINAGE DESIGN THAT MAKES SENSE
addition to in-person feedback and
discussion
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RECENT PROGRESS
October 2016
Approved drainage standards and voted to
move forward with drainage coalition
December 2016
– April 2017
Coalition meetings to identify priority
projects and get input on draft ordinances
April – May 2017
Community stakeholder meetings and
discussions on draft ordinances and regional
detention strategies
May 2017
Comments received from stakeholders on
draft ordinances and considered for
incorporation into proposed ordinances
DRAINAGE DESIGN THAT MAKES SENSE
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Development Standards
CHAPTER 26 ZONING AND DEVELOPMENT
DRAINAGE DESIGN THAT MAKES SENSE
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APPROVED POLICY FRAMEWORK: DESIGN
CRITERIA & PERFORMANCE STANDARDS
• All new development activity must meet or
exceed the following:
– Maintain or lower existing water surface elevation
profiles in receiving system
– Protect and enhance flood storage volumes within
the established 100-year floodplain
– All new structures to follow minimum freeboard
requirements
DRAINAGE DESIGN THAT MAKES SENSE
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CHAPTER 26: CALCASIEU PARISH ZONING
& DEVELOPMENT CODE CHANGES
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Article I
Article II
Article III
Article IV
Article V
Article VI
Article VII
Article VIII
Article IX
Article X
General (Definitions)
Subdivisions
Zoning
Zoning Procedures
Non-Conforming Uses
Special Districts
Technical Design Standards
Coastal Design Management
Floodplain Management
Administration
DRAINAGE DESIGN THAT MAKES SENSE
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KEY CHANGES
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Preliminary Development Conceptual Plans
Required Runoff Management Plan (RMP)
Drainage Impact Fees
Detention and Fill Mitigation Standards
Lateral Right of Way Requirements
Required Drainage Layout and Grading Plans
No work shall commence prior to approval of engineering
plans or permits
• Construction Phasing, Field Inspections and “As-Built”
Drainage Plans
DRAINAGE DESIGN THAT MAKES SENSE
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Stakeholder Feedback
CHAPTER 26 ZONING AND DEVELOPMENT
DRAINAGE DESIGN THAT MAKES SENSE
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STAKEHOLDER REVIEW & FEEDBACK
• Two meetings recently held with area stakeholders to
review draft ordinance changes (engineers, architects,
developers, builders, landowners, realtors, and more)
• Stakeholder comment period from April 25 to May 31
• CPPJ staff reviewed all comments received, and all input
was considered for potential modifications to draft
ordinances
DRAINAGE DESIGN THAT MAKES SENSE
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KEY STAKEHOLDER FEEDBACK
• Floodplain management
– Will new maps be adopted or will floodplains be remapped, effect on
properties and new development
• Fill mitigation
– Why it’s needed, where it is required and how it’s done, effect on new
development
• Freeboard requirements
– Why existing freeboard ordinance needs to be changed, effect on new
development in terms of flexibility and liability
• Runoff Management Plan
– Difference between RMP and Drainage Impact Analysis, need for
additional analysis
DRAINAGE DESIGN THAT MAKES SENSE
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KEY STAKEHOLDER FEEDBACK (CONT’D)
• As-built drawings
– Why new requirements for as-built drainage plans are necessary
• Higher standards
– Right-of-way for drainage laterals, sewer effluent discharge, detention
pond sloping, and minimum pipe size increases
• Drainage impact fees
– Why these fees are needed, how fee structure is determined, how fees
are utilized, do any exemptions exist
• Construction and inspection
– Need for field inspections and milestones for new development
construction, how it will be enforced
DRAINAGE DESIGN THAT MAKES SENSE
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KEY STAKEHOLDER FEEDBACK (CONT’D)
• Post construction operations and maintenance
– How on-site detention pond requirements for O&M plans will be
enforced
• Technical engineering standards
– How CPPJ will account for variances between the Parish and LaDOTD
• Review process
– How Gravity Drainage Districts will be involved
DRAINAGE DESIGN THAT MAKES SENSE
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Draft Ordinance Revisions
CHAPTER 26 ZONING AND DEVELOPMENT
DRAINAGE DESIGN THAT MAKES SENSE
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REVISION CONSIDERATIONS
• Focus has and will continue to be on how to reduce
flooding through long-term policy measures, balancing
sound science and engineering with the need to
continue supporting growth in Calcasieu Parish
• Identified areas where language was unclear or
uncertain and revised accordingly
• Amended, changed, or revised sections to respond to
stakeholder feedback while staying consistent with
overarching policy framework
DRAINAGE DESIGN THAT MAKES SENSE
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KEY CHANGES BASED ON FEEDBACK
• Sec. 26-13: Added paragraph to clarify process for
requirement of a Runoff Management Plan during the
preliminary plat approval process
• Sec. 26-13: Amended lowest as-built elevation under final
plat requirements (“as-built elevation within the proposed
building lines of each lot in accordance with the drainage
layout plan”)
• Sec. 26-14, 26-45: Clarified language surrounding peak
runoff rate
• Sec. 26-14, 26-45: Amended freeboard requirements
section to clarify relevant structures and flood hazard
determination
DRAINAGE DESIGN THAT MAKES SENSE
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KEY CHANGES BASED ON FEEDBACK
(CONT’D)
• Sec. 26-215: Modified waiver structure from Runoff
Management Plan section (removed waiver 1, modified
waivers 2 and 3)
• Sec. 26-215: Changed existing conditions requirement to
reflect the adoption date of the final ordinance
• Sec. 26-215: Changed requirement to one-foot contours
because of minimal elevation changes within Parish
• Sec. 26-215: Clarified requirements for downstream
modeling when a detention pond is used
DRAINAGE DESIGN THAT MAKES SENSE
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KEY CHANGES BASED ON FEEDBACK
(CONT’D)
• Sec. 26-215: Revised language to require areas of ponding
to be incorporated into the development plat
• Sec. 26-216: Added special requirements for developments
receiving waivers under Sec. 26-215
• Sec. 26-216: Revised grading plan requirement language to
clarify the locations of fill to “proposed buildable spaces”
• Sec. 26-216: Added language to allow lots larger than five
acres to have the grading plan performed at the time of
applying for a building permit
DRAINAGE DESIGN THAT MAKES SENSE
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Next Steps
CHAPTER 26 ORDINANCE REVISIONS
DRAINAGE DESIGN THAT MAKES SENSE
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NEXT STEPS
• Respond to questions or concerns from Police Jury related
to revised draft ordinances; continue responding to
stakeholder feedback and requests for information or
clarification
• Request recommendation for adoption of draft ordinance
revisions at June 29 meeting of the Parishwide Drainage
Liaison Committee
• Present Drainage Committee recommendations to Planning
& Zoning Board and full Police Jury in July 2017
• Seek recommendations of Planning & Zoning Board and
adoption by full Police Jury in August 2017
DRAINAGE DESIGN THAT MAKES SENSE
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TIMELINE: ORDINANCE REVISIONS
August
July/August
June 29
June 12
May 25
April/May
Stakeholder
Feedback
Public Works
Committee
Update
DRAINAGE DESIGN THAT MAKES SENSE
Drainage
Committee
Meeting 1
Drainage
Committee
Meeting 2
P&Z Meeting
Police Jury
Meeting 1
P&Z Meeting
Police Jury
Meeting 2
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QUESTIONS?
DRAINAGE DESIGN THAT MAKES SENSE
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