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Heath, MA (Bridge# H-14-009)
SADOGA ROAD BRIDGE OVER
BURRINGTON BROOK
Sadoga Road Bridge Over
Burrington Brook
Heath, MA (Bridge# H-14-009)
BACKGROUND
The bridge currently in place over Burrington Brook was built in
1940 and is now in disrepair.
PROJECT SCOPE OF WORK
1) Replacement of the superstructure
PROJECT SCOPE OF WORK
2) Repair of eroded foundations
MY JOB
1) GATHER DATA
• Stream Length
• Source: Massachusetts Stream Stats
• Main Channel Slope
• Source: HEC-RAS
• Drainage Area
• Source: Massachusetts Stream Stats
• Mean Annual Precipitation
• Source: Massachusetts Stream Stats
HEATH, MA
DRAINAGE AREA = 1.03 SQ. MILES
STREAM LENGTH = 1.29 MILES
ANN. PRECIPITATION = 51.56 INCHES
MAIN CHANNEL SLOPE
Determine Channel Slope
Channel Elevation Distance Traveled Main-Channel Slope
(feet) (miles) (feet / mile)
1 1414.111 0.127
2 1548.632 1.083
∆ 134.521 0.956 140.786
𝐶ℎ𝑎𝑛𝑛𝑒𝑙 𝑆𝑙𝑜𝑝𝑒 =
𝐸𝑙𝑒𝑣𝑎𝑡𝑖𝑜𝑛2 − 𝐸𝑙𝑒𝑣𝑎𝑡𝑖𝑜𝑛1
𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒2 − 𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒1
MY JOB
2) ESTIMATE PEAK FLOW MAGNITUDES
Since The Main-Channel Slope = 140.8 feet / mile > 50 feet / mile,
Burrington Brook is considered a STEEP STREAM.
10 Year Flood Peak Flow Estimation (using steep stream equation):
𝑄10 = 0.02430𝐴0.891 𝑃2.21
Knowing 𝑃 = 51.56 𝑖𝑛 and 𝐴 = 1.03 𝑚𝑖 …
𝑸 𝟏𝟎 = 𝟏𝟓𝟏. 𝟕𝟗𝟒
𝒇𝒕 𝟑
𝒔𝒆𝒄
MY JOB
2) ESTIMATE PEAK FLOW MAGNITUDES
Compare to 25-Year flood and 100-Year flood peak flows:
25 Year Flood Peak Flow Estimation:
𝑄25 = 0.03387𝐴0.893 𝑃2.20
𝑄25 = 203.408
𝑓𝑡3
𝑠𝑒𝑐
100 Year (Base) Flood Peak Flow Estimation:
𝑄100 = 0.05765𝐴0.897
𝑃2.15
𝑄100 = 284.307
𝑓𝑡3
𝑠𝑒𝑐
MY JOB
3) DETERMINE CROSS-SECTIONAL AREAS
Primary Purpose
• Water flow (Q) depends on Water Velocity (v) and Channel
Cross-Sectional Area (A)
• Cross-Sectional Area changes a great deal in a river
• Depending upon the river’s area (at any one point), we can
determine the water surface elevation
• This is important for determining the appropriate
height for the bridge
Software: Watershed Modeling System (WMS)
MY JOB
3) DETERMINE CROSS-SECTIONAL AREAS
MY JOB
3) DETERMINE CROSS-SECTIONAL AREAS
MY JOB
4) DETERMINE CHANNEL PROFILE
• Software: HEC-RAS
MY JOB
5) DETERMINE SCOUR DEPTH
What is Scour?
Definition: Erosion caused by swiftly moving water on the
abutments of a bridge, which could eventually threaten the
bridge’s structural integrity
3 Types of Scour: Contraction, Pier and Abutment
For this particular bridge, the bridge was short enough to not
require piers in its design. Further, the bridge opening is
appropriately sized for the brook and there is therefore no
contraction scour (the water does not have to squeeze inside a
small opening to pass under the bridge).
MY JOB
6) DETERMINE SCOUR DEPTH
According to the LRFD Bridge Manual (Given that Sadoga Road is Local and Rural):
i)Scour Design Flood Frequency = 25 Years
ii)Scour Check Flood Return Frequency = 50 Years
MY JOB
5) DETERMINE SCOUR DEPTH
MassDOT Abutment Scour Equation:
𝑌𝑠
𝑌𝑎
= 2.27𝐾1 𝐾2(
𝐿′
𝑌𝑎
)0.43 𝐹𝑟0.61
𝐾1= coefficient for abutment shape
𝐾2= coefficient for angle of embankment to flow
𝐿′
= the length of abutment projected normal to flow, (ft)
𝑌𝑎= average depth of flow in the floodplain, (ft)
𝐹𝑟= the Froude Number, 𝐹𝑟 =
𝑉𝑒
𝑔𝑌𝑎
𝑉𝑒 =
𝑄 𝑒
𝐴 𝑒
, (ft/s)
𝑄 𝑒= the flow obstructed by the abutment and approach embankments (ft3/s)
𝐴 𝑒= flow area of approach cross section blocked by embankments, (ft2)
𝑌𝑠= scour depth, (ft)
Scour Depth (𝒀 𝒔) @ 25 Years = 1.95 Feet
Scour Depth (𝒀 𝒔) @ 50 Years = 2.11 Feet
MY JOB
6) MAKE RECOMMENDATIONS
Recommendation #1:
Hydraulic Design Flood Return Frequency = 10 Years
MY JOB
6) MAKE RECOMMENDATIONS
Recommendation #2:
Peak Water Surface Elevation Directly Upstream of Bridge (10 Year Design) = 1402.02 feet
MY JOB
6) MAKE RECOMMENDATIONS
Scour Depth
Below Channel Floor
Recommendation #3: Scour Depth
Scour Depth (𝒀 𝒔) @ 25 Years = 1.95 Feet
Scour Depth (𝒀 𝒔) @ 50 Years = 2.11 Feet
HYDRAULIC REPORT OUTLINE
1. Executive Summary – Summarize the scope and significant results of the study
2. Project Description – Define the context of existing structure within the local and regional built and
natural environment. Five sections:
I. Existing Bridge
II. Crossed waterway
III. Highway conveyed
IV. Land uses in the vicinity of the bridge
V. Special site considerations
3. Data Collection – Summarize the results of the hydraulic study’s data collection
4. Engineering Methods – Identify Analytical Methods
I. Hydrologic Analyses
II. Hydraulic Analyses
III. Scour Safety/Stability Analyses
5. Conclusions and Recommendations
6. Appendices
BURRINGTON BROOK
10, 25, 50, 100 & 500 PEAK FLOWS
ANY QUESTIONS?
Any Questions?

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Intern PPT Presentation

  • 1. Heath, MA (Bridge# H-14-009) SADOGA ROAD BRIDGE OVER BURRINGTON BROOK Sadoga Road Bridge Over Burrington Brook Heath, MA (Bridge# H-14-009)
  • 2. BACKGROUND The bridge currently in place over Burrington Brook was built in 1940 and is now in disrepair.
  • 3. PROJECT SCOPE OF WORK 1) Replacement of the superstructure
  • 4. PROJECT SCOPE OF WORK 2) Repair of eroded foundations
  • 5. MY JOB 1) GATHER DATA • Stream Length • Source: Massachusetts Stream Stats • Main Channel Slope • Source: HEC-RAS • Drainage Area • Source: Massachusetts Stream Stats • Mean Annual Precipitation • Source: Massachusetts Stream Stats
  • 7. DRAINAGE AREA = 1.03 SQ. MILES STREAM LENGTH = 1.29 MILES ANN. PRECIPITATION = 51.56 INCHES
  • 8. MAIN CHANNEL SLOPE Determine Channel Slope Channel Elevation Distance Traveled Main-Channel Slope (feet) (miles) (feet / mile) 1 1414.111 0.127 2 1548.632 1.083 ∆ 134.521 0.956 140.786 𝐶ℎ𝑎𝑛𝑛𝑒𝑙 𝑆𝑙𝑜𝑝𝑒 = 𝐸𝑙𝑒𝑣𝑎𝑡𝑖𝑜𝑛2 − 𝐸𝑙𝑒𝑣𝑎𝑡𝑖𝑜𝑛1 𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒2 − 𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒1
  • 9. MY JOB 2) ESTIMATE PEAK FLOW MAGNITUDES Since The Main-Channel Slope = 140.8 feet / mile > 50 feet / mile, Burrington Brook is considered a STEEP STREAM. 10 Year Flood Peak Flow Estimation (using steep stream equation): 𝑄10 = 0.02430𝐴0.891 𝑃2.21 Knowing 𝑃 = 51.56 𝑖𝑛 and 𝐴 = 1.03 𝑚𝑖 … 𝑸 𝟏𝟎 = 𝟏𝟓𝟏. 𝟕𝟗𝟒 𝒇𝒕 𝟑 𝒔𝒆𝒄
  • 10. MY JOB 2) ESTIMATE PEAK FLOW MAGNITUDES Compare to 25-Year flood and 100-Year flood peak flows: 25 Year Flood Peak Flow Estimation: 𝑄25 = 0.03387𝐴0.893 𝑃2.20 𝑄25 = 203.408 𝑓𝑡3 𝑠𝑒𝑐 100 Year (Base) Flood Peak Flow Estimation: 𝑄100 = 0.05765𝐴0.897 𝑃2.15 𝑄100 = 284.307 𝑓𝑡3 𝑠𝑒𝑐
  • 11. MY JOB 3) DETERMINE CROSS-SECTIONAL AREAS Primary Purpose • Water flow (Q) depends on Water Velocity (v) and Channel Cross-Sectional Area (A) • Cross-Sectional Area changes a great deal in a river • Depending upon the river’s area (at any one point), we can determine the water surface elevation • This is important for determining the appropriate height for the bridge Software: Watershed Modeling System (WMS)
  • 12. MY JOB 3) DETERMINE CROSS-SECTIONAL AREAS
  • 13. MY JOB 3) DETERMINE CROSS-SECTIONAL AREAS
  • 14. MY JOB 4) DETERMINE CHANNEL PROFILE • Software: HEC-RAS
  • 15. MY JOB 5) DETERMINE SCOUR DEPTH What is Scour? Definition: Erosion caused by swiftly moving water on the abutments of a bridge, which could eventually threaten the bridge’s structural integrity 3 Types of Scour: Contraction, Pier and Abutment For this particular bridge, the bridge was short enough to not require piers in its design. Further, the bridge opening is appropriately sized for the brook and there is therefore no contraction scour (the water does not have to squeeze inside a small opening to pass under the bridge).
  • 16. MY JOB 6) DETERMINE SCOUR DEPTH According to the LRFD Bridge Manual (Given that Sadoga Road is Local and Rural): i)Scour Design Flood Frequency = 25 Years ii)Scour Check Flood Return Frequency = 50 Years
  • 17. MY JOB 5) DETERMINE SCOUR DEPTH MassDOT Abutment Scour Equation: 𝑌𝑠 𝑌𝑎 = 2.27𝐾1 𝐾2( 𝐿′ 𝑌𝑎 )0.43 𝐹𝑟0.61 𝐾1= coefficient for abutment shape 𝐾2= coefficient for angle of embankment to flow 𝐿′ = the length of abutment projected normal to flow, (ft) 𝑌𝑎= average depth of flow in the floodplain, (ft) 𝐹𝑟= the Froude Number, 𝐹𝑟 = 𝑉𝑒 𝑔𝑌𝑎 𝑉𝑒 = 𝑄 𝑒 𝐴 𝑒 , (ft/s) 𝑄 𝑒= the flow obstructed by the abutment and approach embankments (ft3/s) 𝐴 𝑒= flow area of approach cross section blocked by embankments, (ft2) 𝑌𝑠= scour depth, (ft) Scour Depth (𝒀 𝒔) @ 25 Years = 1.95 Feet Scour Depth (𝒀 𝒔) @ 50 Years = 2.11 Feet
  • 18. MY JOB 6) MAKE RECOMMENDATIONS Recommendation #1: Hydraulic Design Flood Return Frequency = 10 Years
  • 19. MY JOB 6) MAKE RECOMMENDATIONS Recommendation #2: Peak Water Surface Elevation Directly Upstream of Bridge (10 Year Design) = 1402.02 feet
  • 20. MY JOB 6) MAKE RECOMMENDATIONS Scour Depth Below Channel Floor Recommendation #3: Scour Depth Scour Depth (𝒀 𝒔) @ 25 Years = 1.95 Feet Scour Depth (𝒀 𝒔) @ 50 Years = 2.11 Feet
  • 21. HYDRAULIC REPORT OUTLINE 1. Executive Summary – Summarize the scope and significant results of the study 2. Project Description – Define the context of existing structure within the local and regional built and natural environment. Five sections: I. Existing Bridge II. Crossed waterway III. Highway conveyed IV. Land uses in the vicinity of the bridge V. Special site considerations 3. Data Collection – Summarize the results of the hydraulic study’s data collection 4. Engineering Methods – Identify Analytical Methods I. Hydrologic Analyses II. Hydraulic Analyses III. Scour Safety/Stability Analyses 5. Conclusions and Recommendations 6. Appendices
  • 22. BURRINGTON BROOK 10, 25, 50, 100 & 500 PEAK FLOWS