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Town of MadisonCarver-Martin Neighborhood
Flood Reduction Drainage Improvement Study
Presentation Agenda
Study Scope of Work
1. Limited Survey of Neighborhood2. Modeling
• Hydrologic• 1-D Hydraulic• 2-D Hydraulic
3. Conceptual Engineering Design4. Conceptual Cost Estimates
Current Study Flood Mapping
Limited Survey of Neighborhood
Presentation Agenda
Study Scope of Work
1. Limited Survey of Neighborhood2. Modeling
• Hydrologic• 1-D Hydraulic• 2-D Hydraulic
3. Conceptual Engineering Design4. Conceptual Cost Estimates
Modeling Study Limits
Watershed area = 735 acres
Carver-Martin Neighborhood
2010 Arboretum Pond 3 Design & Martin Street Pond Study
2008 Pond 4 Design Study
Expansion of Previous Design Studies
Modeling Study Limits
Modeling Study Limits
Pond 3
Pond 4Martin St. Pond
Presentation Agenda
Study Scope of Work
1. Limited Survey of Neighborhood2. Modeling
• Hydrologic• 1-D Hydraulic• 2-D Hydraulic
3. Conceptual Engineering Design4. Conceptual Cost Estimates
Past Modeling Studies - FEMA
FEMA mapping shows only 100-yr and 500-yr flood boundaries
Past Modeling Studies - FEMA
Current Study Flood Mapping
2-D Modeling
Current Study Flood Mapping Event Rainfall Depth
1-yr 24-hr 2.49 in.
10-yr 24-hr 4.09 in
25-yr 24-hr 5.01 in
50-yr 24-hr 5.80 in
100-yr 24-hr 6.66 in
Current Study Flood Mapping Event Rainfall Depth
1-yr 24-hr 2.49 in.
10-yr 24-hr 4.09 in
25-yr 24-hr 5.01 in
50-yr 24-hr 5.80 in
100-yr 24-hr 6.66 in
Current Study Flood Mapping Event Rainfall Depth
1-yr 24-hr 2.49 in.
10-yr 24-hr 4.09 in
25-yr 24-hr 5.01 in
50-yr 24-hr 5.80 in
100-yr 24-hr 6.66 in
Current Study Flood Mapping Event Rainfall Depth
1-yr 24-hr 2.49 in.
10-yr 24-hr 4.09 in
25-yr 24-hr 5.01 in
50-yr 24-hr 5.80 in
100-yr 24-hr 6.66 in
Current Study Flood Mapping Event Rainfall Depth
1-yr 24-hr 2.49 in.
10-yr 24-hr 4.09 in
25-yr 24-hr 5.01 in
50-yr 24-hr 5.80 in
100-yr 24-hr 6.66 in
Presentation Agenda
Study Scope of Work
1. Limited Survey of Neighborhood2. Modeling
• Hydrologic• 1-D Hydraulic• 2-D Hydraulic
3. Conceptual Engineering Design4. Conceptual Cost Estimates
Common Philosophy:• Most municipal strategies geared toward protecting homes and
businesses from 100-yr flooding.
• Solutions generally target improvements to publicly owned drainage systems.
• Drainage issues that are not caused by stormwater runoff from public infrastructure (streets, greenways, ponds, etc.) are generally not included in municipal flood control strategies.
• Nevertheless, the health of a community as well as local property values can be negatively affected by widespread drainage and flooding problems, regardless of cause.
Flood Reduction and Drainage Improvement Policy
Flood Reduction and Drainage Improvement Policy
City of Madison Approach
Conceptual Engineering Designs - Regional
Conceptual Engineering Designs - Regional
Raise Berm on Martin Street Pond
Improve Drainage East of Dodge St.
Conceptual Engineering Designs - Regional
Raise Berm on Martin Street Pond
Improve Drainage East of Dodge St.
Conceptual Engineering Designs - Regional
Raise Berm on Martin Street Pond
Improve Drainage East of Dodge St.
Conceptual Engineering Designs - Regional
Conceptual Engineering Designs - Local
Stormwater Pump Station
Conceptual Engineering Designs - Local
Systemic Roadside Swales
Conceptual Engineering Designs - Local
Systemic Roadside SwalesMay have limited effectiveness serving backyard areas
Conceptual Engineering Designs - Local
Systemic Drain Tile System
Conceptual Engineering Designs - Local
Presentation Agenda
Study Scope of Work
1. Limited Survey of Neighborhood2. Modeling
• Hydrologic• 1-D Hydraulic• 2-D Hydraulic
3. Conceptual Engineering Design4. Conceptual Cost Estimates
Conceptual Engineering Cost Estimates
Regional• Martin Street Pond Improvement - $300,000• Dodge Street Improvements - $70,000
Local• Stormwater Pump Station - $200,000
• Roadside Swales - $1,300,000 (+ Pump Station)OR
• Backyard Tiles - $1,400,000 (+ Pump Station)
The challenges to achieving either of the above regional drainage improvements will be substantial and will require additional study and design as well as a great deal of coordination and cooperation with neighborhood residents.