HomeMy WebLinkAbout(D1) Council Update on District 3 Drainage Projects 8-16-22 - CopyDistrict 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
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
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
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
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
DocumentPath:P:\0093\003\Deliverables\2020.07.DD(PortArthurSubmittal1)\Compilation_Docs\Exhibits\EX03_Landuse.mxd±
Source:Esri, DigitalGlobe,GeoEye, Earthstar
Geographics,CNES/AirbusDS,USDA, USGS,
AeroGRID IGN andthe GISUserCommunity
LEGEND
Project_Area
Major Streams (Project)
LandUse
GA
H
D
I
C
R
L
1
R
L
2
R
R
R
S
1
R
S
2
T
U
W
Feet
0 200 400 8001,200
CoordinateSystem
Sources Projection:NAD83StatePlane(Grid)
1.Source1 Zone:TexasSouth Central
2.Source2
Units:U.S.Feet 3.Source3
4.Source4
Notes
STONEGATE
PROJECT AREA
JIMMY
JOHNSON
9TH
AVENUE
LAKE
ARTHUR DR
STONEGATE IMPACT
AREA
Lake Arthur Drainage Project Review
Lake Arthur Detention $19,100,000.00
Storm
Frequency
Avg
Existing
*WSE (ft)
Avg Existing
Inundation-
Home Flooding
(ft)
Avg Pre-
Mitigation
Structure Loss
Value ($)
After
mitigation
*WSE (ft)
Avg Proposed
Inundation
Home
Flooding (ft)
Avg Post
Mitigation
Structure Loss
Value ($)
Avg
Difference in
*WSE (ft)
Avg
Diff in
WSE
(inch)
2 YR 1.84 -2.93 $ 170,374.00 1.63 -3.14 $ 54,446.75 0.21 2.52
10 YR 2.6 -2.17 $ 1,323,864.38 2.22 -2.55 $ 494,013.63 0.38 4.56
25 YR 2.86 -1.92 $ 3,103,187.74 2.28 -2.49 $ 632,944.85 0.58 6.96
50 YR 3.16 -1.35 $ 7,673,098.67 2.54 -2.04 $ 1,889,448.30 0.62 7.44
100 YR 3.42 -1.35 $ 7,505,570.21 2.73 -2.04 $ 1,875,955.74 0.69 8.28
500 YR 4 -0.78 $18,150,801.30 3.14 -1.64 $ 3,422,338.64 0.86 10.32
* Avg Finished Floor Elevation (FFE) for 270 properties in the project impact area is 4.78 ft
* WSE -Water
Surface Elevations
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’
Lake Arthur Drainage Project Review
Lake Arthur Drainage Project Review
STRUCTURAL ELEVATIONHOME FLOODINGDRAINAGE CAPACITYSTREETFLOODING
Node Name
2-YearStormFrequency 10-YearStorm Frequency 25-YearStorm Frequency 50-YearStorm Frequency 100-Year StormFrequency 500-Year StormFrequency
Existing
Depth
(ft)
Propose
d Depth
(ft)
Differenc
e (PR-
EX)
Existing
Depth
(ft)
Propose
d Depth
(ft)
Differenc
e (PR-
EX)
Existing
Depth
(ft)
Propose
d Depth
(ft)
Differenc
e (PR-
EX)
Existing
Depth
(ft)
Propose
d Depth
(ft)
Differen
ce
(PR-
EX)
Existing
Depth
(ft)
Propose
d Depth
(ft)
Differen
ce
(PR-
EX)
Existing
Depth
(ft)
Propose
d Depth
(ft)
Differen
ce
(PR-
EX)
IndianValley Dr 0.38 0.42 0.03 1.09 1.09 0.00 1.22 1.09 -0.13 1.22 1.22 0.00 1.26 1.26 0.00 1.37 1.36 0.00
Indian RiverDr 0.58 0.62 0.03 1.29 1.29 0.00 1.42 1.29 -0.13 1.42 1.42 0.00 1.46 1.46 0.00 1.57 1.56 0.00
IndianFallsDr -0.02 0.02 0.03 0.69 0.69 0.00 0.82 0.69 -0.13 0.82 0.82 0.00 0.86 0.86 0.00 0.97 0.96 0.00
Brazos Ave 1.22 1.13 -0.09 2.09 1.58 -0.50 2.34 1.59 -0.75 2.65 1.85 -0.80 2.90 2.04 -0.86 3.50 2.61 -0.90
AngelFireCv 0.72 0.80 0.09 1.43 1.43 0.00 1.78 1.43 -0.35 1.78 1.78 0.00 1.86 1.86 0.00 2.09 2.08 -0.01
BreckenridgeCt 0.77 0.76 -0.01 1.41 1.40 0.00 1.77 1.40 -0.37 1.78 1.77 -0.01 1.93 1.90 -0.02 2.23 2.20 -0.02
RollingRockDr 0.69 0.61 -0.08 1.28 1.22 -0.07 1.42 1.22 -0.20 1.80 1.67 -0.13 2.02 1.77 -0.24 2.60 2.02 -0.58
Lake Arthur Dr 0.62 0.14 -0.48 1.80 1.05 -0.75 2.17 1.09 -1.08 2.44 1.55 -0.89 2.77 1.69 -1.07 3.40 2.15 -1.25
Kelliwood Dr 0.76 0.81 0.05 1.91 1.41 -0.50 2.28 1.36 -0.92 2.54 1.78 -0.76 2.87 2.00 -0.86 3.50 2.34 -1.17
Royal Meadows St 1.24 -0.01 -1.25 1.54 1.12 -0.42 1.70 1.44 -0.26 2.16 1.61 -0.55 2.47 1.66 -0.80 3.10 1.94 -1.16
Kylewood Ct 0.46 -0.35 -0.81 1.23 1.06 -0.17 1.46 1.10 -0.36 1.48 1.46 -0.02 1.67 1.59 -0.08 2.12 1.90 -0.22
Jasonwood Ct -0.77 -0.96 -0.19 0.58 0.56 -0.03 0.84 0.62 -0.23 1.20 0.84 -0.36 1.77 1.29 -0.48 2.57 2.25 -0.31
Markwood Ct -0.58 -0.59 -0.01 1.03 0.96 -0.07 1.07 0.98 -0.10 1.48 1.07 -0.41 2.10 1.66 -0.44 3.00 2.60 -0.39
Sherylwood Dr -0.48 -0.57 -0.09 0.86 0.89 0.03 1.18 0.91 -0.27 1.20 1.18 -0.02 1.44 1.32 -0.12 2.22 1.94 -0.28
Stevewood Dr 0.91 0.87 -0.04 1.44 1.19 -0.25 1.79 1.31 -0.48 2.07 1.58 -0.49 2.36 1.77 -0.59 3.00 2.35 -0.66
KandywoodDr 1.08 1.06 -0.02 1.64 1.31 -0.33 1.99 1.46 -0.53 2.25 1.71 -0.55 2.56 1.92 -0.64 3.20 2.52 -0.68
Lisa Wood Ct 0.53 0.38 -0.15 1.30 1.29 -0.01 1.54 1.21 -0.33 1.58 1.54 -0.04 1.82 1.71 -0.11 2.34 2.26 -0.08
Table 9
AveragePonding Depth Comparison
Existingvs Proposed
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