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SMP_FinalPublicMeeting_FINAL_083022.pptx
- 1. PublicMeeting Tuesday, August 30, 2022 6:00 PM
- 2. Sharon Weston Broome Mayor-President East Baton Rouge Parish
- 3. Agenda • Goals of the Stormwater Master Plan • Project Data Summary • Recommended Projects • Recommended Updates to Codes & Ordinances • Program Budget • Project Benefits • Grant Funding Opportunities • Key Takeaways
- 4. • LA wettest state in the lower 48 • 1” water can cause $25,000 damages • $6 B nationwide annual flood damages w/ 4-fold increase since early 1900’s • 40% parish area in the 100-yr floodplain • Topography relatively flat w/ clearly defined ridges • Drains mostly to the Amite River Baton Rouge Stormwater Overview Amite River
- 5. Goals of Stormwater Master Plan Identify flood-related risks and vulnerabilities Mitigate risks through recommended capital improvements projects considering climate change Recommend policy solutions to reduce local flood risk Focus on mitigation of damages of many and not individual properties Develop and maintain stormwater infrastructure
- 6. The More We Know Project Data Summary Root Causes of Flooding Flood Hazard Assessment Findings
- 9. RootCauses ofFlooding Urbanization Increase in runoff due to an increase in impervious areas Developmentin the floodplain Increase in runoff as well as loss of floodplain water storage. Lack of Maintenance Climate Change Increase in rainfall is expected 0 50,000,000 100,000,000 150,000,000 200,000,000 250,000,000 0 20 40 60 80 100 120 140 160 180 200 220 Recurrence Interval (yr)/Storm event 2010 Climate 2085 Climate Damages in $ Potential Impact of Climate Change
- 11. RecommendedProjects Recommended Projects Recommended Project Types Project Impacts Across Watersheds Awarded Projects
- 12. Recommended Projects Project Development Process • Identified 350+ projects • Reduced list to 115 projects • Prepared concept designs, cost, benefit/cost & technical score • 65 projects recommended • 2 projects recommended for floodplain preservation
- 13. Recommended Project Types • Bridge/culvert replacements • Channel improvements • Detention • Floodplain preservation/restoration • Levees/floodwalls • Pump stations • Diversion channels • Establish overflow routes • Subsurface system improvements
- 14. Hurricane Creek Scenario: 13” in 24 Hr Glen Oaks Area of Hurricane Creek
- 15. Project Description Example Project and Benefit (HED-01) Project Benefits
- 17. Project Description Example Project and Benefit (JCK -11) Project Benefits
- 19. AwardedProjects
- 21. Codes& Ordinances Proposed Policy Changes Indepth Look (Conveyance, Fill, Setback)
- 23. Conveyance Zone • PROBLEM: Development activities that block or reduce the ability of stormwater to flow where it naturally would and forces it elsewhere increasing flood risk for surrounding properties • PROPOSED SOLUTION: Floodplain Conveyance Zones will be established by the City-Parish and made available via the EBRGIS Open Data website. • EXAMPLE: draft proposed Floodplain Conveyance Zone for Jones creek.
- 24. Fill Mitigation • PROBLEM: When fill placed in the floodplain & is not properly mitigated, it reduces the storage volume capacity of the floodplain, thereby, pushing floodwater somewhere else. • PROPOSED SOLUTION: See diagram
- 25. StreamSetback • PROBLEM: Building right up to channels can create problems that are difficult to reverse, such as complications due to erosion and runoff, habitat loss, and lack of access for future channel improvements. • PROPOSED SOLUTION: Establish stream setbacks along major streams. See diagram.
- 26. WheretheWater Hits the Drain Project Benefits & Budget Risk Reducing Funding & Grant Opportunities Key Takeaways
Hinweis der Redaktion
- Claire
- Claire introduce the mayor
- Melissa Thank you mayor. Thanks to all of you for coming and glad to see so many people. We want to thank all of the people who provided us data and information – much of it coming from you. First I want you to know that this is Louisiana Flood Awareness Week – very appropriate we are talking about this now. Tonight were going to give an overview of the results and recommendations for the SMP – from data collection to final recommendations.
- This is just a reminder of our flood risk and overview of how drainage in the Parish works. LA is the wettest state in the lower 48 – and as the map shows by the hatching 40% parish is in the FEMA designated floodplain . Topography Flat - The colors show different elevations throughout the parish with the browns and oranges being high and the greens and blues being low – lowest areas in the southern portion of the parish as well as towards the Amite River Red arrows show the general direction of water flow – most flows to the Amite river. The northwest area of the parish flows towards the Mississippi river. .
- Goals set up a number of years ago through a workshop with Parish administration and the project team. Mandate – science and data driven – unbiased - didn’t focus on political boundaries or wants of any particular entity or organization. For each of these goals you will notice a check mark - because I believe through this plan we have achieved those goals Determined where it floods, the extent and impact Developed projects and polices to reduce flood risk with consideration for climate change Focus was on maximizing benefits for most people. We recognized we are not going to solve every issue , but Parish will have the data evaluate other areas. Also want emphasize that our recommendations do NOT eliminate flooding. We are focused on reducing the risk. We identified and mapped the system and provided data for current mainteinance and future maintenace planning.
- Before we get into the meat of the proejct I want to indrocuce the team Jeff Doudrick from HNTB – Senior Engieer and technical lead Mario Durbic and Darby Cressy with HNTB – engineers for the model and projects development Mark Goodson from CSRS our lead on policy recommendations Stokka Brown & Brandon Campo – Engineers from CSRS – modeling, and policy evaluations And our folks from Franklin Associates, Especially Claire Pittman and Johnathan Hill – lead on all things public engagement
- Many have seen this before – We literally spent ½ of the entire budget on identifying and mapping the system. Took over a year to collect this information utilizing up to 12 teams at one time to collect the inforamtion.. Structures we talk about up here those are the inlets, manholes and pipes that make up the subsurface system – area that drains below ground. What did we do with that data? Spent aDeveloped computerized models to evaluate the system, simulate various storm events and use those models to identify and evaluate solutions. 3 tiered approach with Teir 1 being the large model covering the entire Amite basin to evaluate large regional events, Teir 2 to address our local communities and tier 3 to address our neighborhoods.
- We are able to obtain federal funds from output of the data and modeling in terms of grants for projects that have already been approved and in various phases of development. Potential projects we originally identified over 300 projects with recommending 65 projects . Talk more about this in a minute.
- Urbanization – As more structures and pavement are constructed, that water that used to seep into the ground No longer can and you get more water going into the system. More water contributes to flooding. Development in floodplain- In general means the loss of the area that provides floodplain storage. Lose floodplain storage the water has to go somewhere – results in flooding. Lack of Maintenance – clogged or broken pipes and culverts or blocked channels means the water can’t get out which can result in flooding. Climate Change: For LA means warmer atmosphere, more moisture, more rainfall. Graph shows the impact of just climate change on the future if all things stayed as exactly as they are today. Different storm events along the bottom and the damages associated with these events. Shows the stom events in the future will results in more damages.
- This are some of the issues we saw from model output as well as data form the public. I am going to highlight a few. Overland flow route – when there is a physical barrier placed that prevents water from going where it originally wants to go. Example is I-12 during 2016 flood. I will show an example later of how water wants to go where it wants to go. Loss of Floodplain storage – Going to be discussed later Comite Diversion – Diverts some of the water to the MS that would normally flow from the Comite to the Amite river f Critical Maintenance – structures that if not maintianed in good condition – clogged or broken can cause flooding – example would be an outlet from a neighborhood or think of the underground culvert portion of Corporation Canal. 2016 perfect example of backwater flooding. We talked about some of the others
- Explain our process. Identified areas of concern based on the model results as well as information from the public and then Identified projects that we thought would have a reasonable chance of reducing risk. 0ver 350 of those Some did not provide the benefit we thought, that and other reasons the list was pared down to 115 in which completed detailed cost and conceptual deign. We ultimiatley recommended 65 projects for the plan – 3 of which are floodplain preservation projects – again trying to mitigate further loss of floodplain storage. If you want to see more – we have the projects list and maps on the tables for you to look at and ask questions. .
- This is list of the types of projects evaluated and some recommended. This is not a complete list but does cover the majority of the potential projects. Photos show a few examples. What see here is the area of Elbow Bayou currently undeveloped and would like to keep that way and preserve it for floodplain storage. Other image shows a detention site with the controlled outlet. I
- JEFF Project #1 Glen Oaks Flood Source: Overflow Path Projects Channel Widening Detention upstream Box culvert along Glen Oaks
- What you see here is an example of a proposed project on the left . Putting in a relief sewer to collect the water that wants to go that way. It also includes some DS storage so that we don’t cause DS impacts. Graphic on the right – blue shows the area of water surface reductions and the yellow highlight those structures in which damages are reduced through the implementation of this project,
- So this is lively bayou – tributary to Jones Creek We are at sS Flannery between Florida Blvd and Goodwood. This is a sumulation of the an approx. 100-yr event. Notice the construction of water trying o squeeze through narrow channel and bridge.
- On the left. - proposed solution is to widen that bridge and do some channel improvements to help the water get through. On the right the is the benefits of that project in that 100- year scenario. Again the blue indicates water surface reductions from the project. Red indicates increases in WSEL. In detailed design would need to make sure that is mitigated if causing any issues.
- Some projects by themselves do result in DS/US impacts but when combined with other projects we can mitigate that impact. This is map of a series of proposed projects for the Jones Creek to help reduce the flood risk. Some of these can be constructed by themselves – usually the detention projects because they are holding water during an event. Channel improvements often cause impacts so those often need to be constructed in combination with others. So for combination projects – need to construct those that do not cause impacts or are needed for those that do. Then usually the channel improvements we want to construct from DS to US.
- You have seen this slide before as well – previously approved projects. These were not included in our list as they have already been funded and are in various stages of development.
- Other ongoing work by the Parish – Rec’d American Rescue Plan Act funds that has been put towards the backlog of maintenance. Previous identifed data provide information to Parihs on where to focus efforts cleaning out the subsurface system.. 311 system is also being utilized to address outstanding maintenance. Photos show some of the maintenance work ongoing now. The Parish has what is called a “Dashboard” that you can log into to see the locations of complaints and the status of addressing those. The link is also on the board set up over ther.
- Policies – Not just for Residential Commercial development – public projects, road projects. Stream Setbacks Based on best practices, Allowable uses within setback are limited to low-impact, passive uses that require little to no disturbance, grading, clearing, or filling. Utilize “stream segments” map on EBRGIS Open Data website as a guide, to be verified by survey Owners may get credit towards yard requirements Fill Mitigation –Can’t use detention for fill mitigation – evaluating depth to mitigate. Rainfall Criteria Recommend future rainfall depth (Climate Change analysis) Evaluating the AEP Events for specific design elements – for site drainage, detention, riads and bridges. Overland Flow Check – this is to ensure that floodplain flow across the site is maintained and allowed to get to it’s receiving water and Not cause impact to adjacent properties. Conveyance Zones Goals: Protect Existing Conveyance of Stormwater Prevent Offsite Impacts due to Development (within “main” conveyance) Utilize EBRGIS Open Data website for official Conveyance Zone Map(s) Treat Conveyance Zones much like FEMA Floodways (UDC 15.23) Status: Using combination of depth & velocity to define
- I want to summarize everything and discuss the path forward.
- In addition to our recommended projects and policies there is a whole list of other benefits form the work developing the SMP. Model and data: Provide flood risk maps Used to evaluate other areas not addressed here Opportunity to update the FEMA flood maps Obtain additonal CRS credits for the community that can lower flood insurance rates for all. Models to evaluate developments and/ available for public use Support MS4 compliance All of this puts the Parish in a good position to apply for additional grant funding opportunities. We want to continue to keep you informed. If you haven't had a chance to listen to our Stormwater Talk podcasts, I recommend them.
- Suggested overall program budget Not only the CIP budget but other recommended programmatic items. for a total of $1.66 B Also include an implementation cost for the policies, upkeep to the models and keeping the public informed. This is a hefty price tag but it has been a long time coming to address all these outstanding issues.
- As we previously indicated over $89 million has already been identified for grant projects. There is up to I believe $56 million applied to the backlog of maintenance – The Parish intends to continue to capitalize on all levels – Federal, state and local.
- As said before the Parish is going to capitalize on al funding streams. I want to share the 3 programs in which we are intending to obtain funding for more drainage projects as listed here at the top. We have or are preparing applications for those projects now. Those are in our CIP list as they have not been approved yet. The other list are those grant opportunities that may be applicable for different types of projects. Some proejcts could be applied for individually while others could be combined with other types of proejcts for grant funding. For example the Flannery rd. bridge project we talked about earlier is a perfect candidate to be included with a bridge(s) grant application. The IIJA is a five year program and the Parish already has people in place evaluating these and identifying projects for potential funding.
- Summary – we are not going to solve all flood problems – but hopefully reduce the risk for all. The above provides a summary I want to highlight that we all live in SE Louisiana and as shown before much of the Parish is in floodplain and all susceptible to flooding. I cannot emphasize enough to obtain flood insurance. We all need to take responsibility: From talking to your neighbor to explain why not to blow leaves and clippings into the street because that clogs our drainage system, We need to work with our community, through our elected officials to pass the codes/ordinances, state and federal governments to institute change and move forward. All of these things need to happen to make a differnce.