HomeMy WebLinkAbout(D1) Council Update on District 3 Drainage Projects 8-16-22
District 3 Drainage Projects Review
404 Project Partners
Stonegate Project
Lake Arthur Project Timeline Highlights
Description of Lake Arthur Project Impact Area Structures
Description of Lake Arthur Project Impact Area Street Ponding
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Multi-faceted Process of FEMA 404 HMGP
Agency
Contribution
CITY OF PORT ARTHUR
ARDURRA
ENGINEERING FIRMS
FEMA/TDEM
OTHER AGENCIES
IDENTIFY THE NEED FOR MITIGATION; PRIORITIZE PROJECTS; ESTABLISH PROJECT SCOPE AND DESIRED OUTCOME; PROVIDE INTERNAL DATA; PROVIDE MATCHING FUNDING
PREPARE APPLICATION; PROVIDE ELIGIBILITY GUIDANCE ON DESIRED SCOPE; RUN BCA; ANSWER RFI; COORDINATE INFORMATION FROM ALL SOURCES; INTERFACE WITH FEMA/TDEM
PROVIDE ENGINEERING ANALYSIS AND PROJECTED OUTCOMES; HYDROLOGIC STUDIES; OFFER ENGINEERING GUIDANCE AND ALTERNATIVES TO MEET DESIRED OUTCOME
INTERPRET APPLICATION DATA; CHALLENGE MODEL DATA FOR PROJECTS; DEVELOP RFIS; APPROVE/DISAPPROVE PROJECTS
GRANT JURISDICTIONAL APPROVAL; PROVIDE COMPLIMENTARY PROJECT SCOPES; OFFER FEEDBACK REGARDING PROJECT IMPACTS
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Lake Arthur Drainage Project Review
Factors of Damage Depth Function (DDF)
Square Footage Value
Type of Property (residential v commercial)
Slab Type
Finished Floor Elevation
Reconstruction Value (cost to replace damaged sq ft)
% of Mean Damage
Water Surface Elevation – Existing (from H&H Model)
Water Surface Elevation – Post Mitigation (from H&H Model)
Content and Displacement Values
Contingent Factors =
Social/Economic Benefits are Added
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Stonegate Drainage Project
Stonegate Project has achieved a BCR of 1.14 within the FEMA guidance and allowable factors and components.
Project is in FEMA approval review process.
14-month construction phase upon approval and bid (2 month bid process)
Project total cost ($17.4M) CDBG-DR/HMGP
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Stonegate Drainage Project
Project Area -
Improvements along the Golf Course, 9th Avenue and Jimmy Johnson Blvd.
Impact Area Streets
Lake Arthur Dr Pleasant Hill
Champions Ct Greenway Point Dr
9th Avenue Oakmont Dr
Roshan Ct Royal Dr
Birchwood Dr Jimmy Johnson Blvd
Memorial Blvd Golfhill Dr
Greenhill Dr Sugarhill Ct
Anchor Dr Regency Dr
Turtle Creek Blvd
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Document Path: P:\0093\003\Deliverables\2020.07.DD (Port Arthur Submittal 1)\Compilation_Docs\Exhibits\EX03_Landuse.mxd
Oakmont Drive
Golfhill Drive
Jimmy Johnson Blv
d
9th Avenue
Lake Arthur Drive
Gre
e
nwa
y
Poin
t
e Drive
STONEGATE PROJECT AREA
JIMMY JOHNSON
9TH AVENUE
LAKE ARTHUR DR
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STONEGATE IMPACT AREA
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Lake Arthur Drainage Project Review
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Lake Arthur Drainage Project Review
2YR FLOOD INUNDATION 1.84’
10YR FLOOD INUNDATION 2.6’
100YR FLOOD INUNDATION 3.42’
50YR FLOOD INUNDATION 3.16’
25YR FLOOD INUNDATION 2.86’
500YR FLOOD INUNDATION 4’
AVG HOME ELEVATION 4.78’ range 3.17’ - 6.55’
11% = 3-4’; 59% 4- 5’; 30% +5’
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Lake Arthur Drainage Project Review
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Lake Arthur Drainage Project Review
STRUCTURAL ELEVATION
HOME FLOODING
DRAINAGE CAPACITY
STREET FLOODING
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Lake Arthur Drainage Project Review
THE WATERMARK OF HARVEY
50+” RAINFALL IN 4 DAYS
LAKE ARTHUR DRAINAGE SYSTEM IS BUILT FOR 2 YR EVENT
DD7 SYSTEM WAS OVERWHELMED- WATER OVERTOPPED SYSTEM
SHEET FLOODING FROM SURROUNDING COUNTY WATERSHED
REGIONAL CAPACITY CAN NOT BE ADDRESSED IN LOCAL PROJECT
RE-FORMULATION OF PLAN TO ADDRESS STREET INUNDATION
TARGET USE OF CDBG-DR FUNDING
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