2017 ASFPM National Conference

Transcription

1 2017 ASFPM National Conference Ladue, Missouri Stormwater Management Program May 4 th, 2017 Presented by: Josiah Holst, PE, CFM

2 City of Ladue, MO Located in St. Louis County Highest median income city in Missouri Population of ~10K Legacy of fine estates and large homes Fully developed High levels of in-fill construction, aka McMansions

3 Who is the watershed authority? Metropolitan St. Louis Sewer District (MSD) is umbrella regulator St. Louis Area Watersheds

4 What is happening now (and in December 2015)?

5 What is happening now (and in December 2015)?

6 What is happening now (and in December 2015)?

7 Why start a program? 1. Need is real 2. Residents support a program (1/2 cent sales tax) 3. City Leaders support a program, but

8 Key Issues Identify Where are the hot spots? Public vs. Private Property Right mix of projects How can we optimize solutions? Prioritize Flooding Projects vs. Stream Projects What about water quality? Downstream impacts? Implement Which projects are worth it? Maximize ROI

9 Program Timeline & Next Steps MASTER PLAN NEXT STEPS April - Dec 2017 Needs Assessment Program Structure Conceptual Engineering Implementation Plan Implementation PHASE II* Data Gathering Preliminary Assessment Public Engagement Advisory Committee Program Policy & Ordinances Cost Sharing Identify projects Prioritize Prepare Master Plan Engage the Public Implementation Plan Council Approval Project Design Permits & Easements Construct Projects Problem Prioritization Small Grant Program Update Master & Implementation Plans Ladue Score Card Repeat Process COMPLETED December 2015 COMPLETED August 2016 COMPLETED April 2017

10 Data Sources & Partners

11 What was assessed? Structure Flooding Structure Erosion Roadway Flooding Problem Types Roadway Erosion Yard Flooding Yard Erosion This is the model that MSD uses, allowing us to seamlessly integrate our program into theirs.

12 Stream Assessment 24 miles assessed

13 Stream Assessment Results GOOD VERY POOR FAIR POOR

14 Stream Assessment Results 52 Problems Identified

15 Deer Creek Watershed Limits Creve Coeur Olivette University City 0 37 square miles drained by the Deer Creek Watershed Town and Country Westwood Des Peres Frontenac Huntleigh Kirkwood Warson Woods Rock Hill Richmond Heights Brentwood 21 municipalities included in the Deer Creek Watershed 100% Ladue lies completely within the Deer Creek Watershed Watershed Boundary

16 Hydrologic Model 207 Number of individual drainage areas broken out of the overall watershed of the City of Ladue 25 Number of square miles of area that drain into the City of Ladue 467 Number of miles of drainage lines created by HR Green in the modeling of the watersheds

17 Hydraulic Model XPSWMM was used to model and analyze the hydraulics of the City s entire system Links Nodes

18 Engaging the Public Project Website #1 tool used to engage public and seek feedback. Very popular tool for the residents. Project Over 130 s were received or sent to this address in addition to the other forms of communication available. Public Engagement Phone Many residents shared their concerns verbally over the phone to document problems. Dogwood Festival HR Green set up a booth at the Dogwood Festival to garner awareness for the program and the ways for residents to get involved. Open House Meetings Over 100 residents met with our scientists and engineers to share information.

19 Resident Concerns

20 Resident Concerns 380 Points from MSD

21 Resident Concerns Points from MSD Points from City

22 Resident Concerns Points from MSD Points from City 551 Points from residents

23 Resident Concerns Points from MSD Points from City 551 Points from residents 167 Points from residents

24 Heat Map 17 20

25 Stream Erosion Risk Zones Bank Height vs. Distance to Structure

26 Optimization of Flood Reduction Solutions

27 Projects

28 The Funnel Concept Phase I: Needs Assessment Where have we been? Problem Points Prioritized Problem Areas Project Solutions & Costs Phase II: Master Plan Where are we now? Community Benefits Prioritize Phase III: Design & Construct Where do we want to be? How do we get there? Implement

29 Implementation Goals Sustainable Share the Cost. Flexibility MSD as a Partner Alleviating Stormwater Problems in Ladue

30 Questions Josiah Holst, PE, CFM