Wastewater System Master Plan and SSO Initiative
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1 Wastewater System Master Plan and SSO Initiative
2 Project Drivers Rapid Population Growth in Fort Worth % Increase in Population Over the Last 10-Years 702, Population , Year Slide #2
3 Project Drivers Increase in SSO s in Recent Years , ,289 TOTAL SSO's RAINFALL , OVERFLOWS (ea) YEAR ANNUAL RAINFALL AVERAGE = 35" +/ ,500 1, , RAINFALL (in) Rainfall Source: (average of Benbrook and Arlington meter site) FY FY FY FY FY FY FY FY FY FY FY FY FY FY FY FISCAL YEAR In 1993, the City embarked on an Integrated Wet Weather Management Program in response to an EPA Administrative Order. This resulted in a dramatic reduction in SSO s as shown by this chart. However, in 2005, the number of SSO s began increasing again Slide #3
4 Project Drivers SSO Concerns Areas within Fort Worth SSO s located throughout City over last 5-years Concentrations of SSO s in Older Portions of Fort Worth Major Redevelopment Activities also Occurring within Downtown Area Slide #4
5 Project Drivers SSO Tracking and Characterization Slide #5
6 Fort Worth SSO Initiative Program PROGRAM INITIATION FEBRUARY 14, 2008 SSO CORRECTIVE ACTION PLAN UPDATE WASTEWATER COLLECTION SYSTEM MASTER PLAN PERFORM SANITARY SEWER CONDITION ASSESSMENTS IN AT LEAST 6 SEWER SUB-BASINS PER YEAR - $5 MILLION PER YEAR MAINTAIN EXISTING PREVENTIVE MAINTENANCE PROGRAMS CONTINUE CURRENT ANNUAL PUBLIC OUTREACH, EDUCATION AND ENFORCEMENT PROGRAMS - $1 MILLION PER YEAR COMPLETE REPAIRS TO THE WASTEWATER COLLECTION SYSTEM ACCORDING TO THE 10-YEAR SCHEDULE SUBMITTED $10 MILLION TO $15 MILLION PER YEAR IN REHABILITATION PROJECTS AND APPROXIMATELY $8 MILLION PER YEAR IN CAPACITY IMPROVEMENTS REGULARLY EVALUATE THE SSO ACTION PLAN EFFECTIVENESS REPORT ANNUALLY ON ALL ASPECTS OF CORRECTIVE ACTION PLAN PROGRAM TERMINATION FEBRUARY 14, 2018 Slide #6
7 Summary of Project Drivers Need for an Integrated Capital Improvement Plan for the Wastewater System Rapid Growth in population & flows Increase in treatment needs Planning for aging infrastructure Coordination with other City initiatives (Impact fees, reuse, TRV & other redevelopment) Compliance with TCEQ SSO Initiative Completed last Wastewater Master Plan 10 years ago Slide #7
8 Wastewater Master Plan Process STRATEGIC PLANNING Wastewater Collection Planning Wastewater Model Update Flow Monitoring & Model Calibration Risk Based Assessment for Renewal Planning Priority Analysis CAPITAL IMPROVEMENT PLAN GIS Coordination Wastewater Treatment Planning Project Funding Options Wastewater Flow Projections Redevelopment Planning Slide #8
9 1. Strategic Planning Assistance Process: Appointment of Advisory Committee to Review Key Issues Three Workshops on Key Wastewater Planning Issues Strategic Plan Report with Newsletter to Stakeholders Council Briefing on Finding and Proposed Path Forward Slide #9
10 1. Strategic Planning Assistance Key issues: Service Area Regulatory Issues Wholesale Customers Level of Service Satellite WWTP s Slide #10
11 Objectives 2. Flow Monitoring Program Measure peak flows coming to VC WWTP (3 Meters for 9 Month Period) Identify high I/I areas and support an accurate WW model (47 Meters for 3 Month Period) Evaluate Potential for Permanent Metering Locations SCADA Slide #11
12 3. Wastewater Model Development QC Program to Facilitate Model Maintenance Compile Plans As-Builts Developer Projects CIP Projects Notes: Steps shaded Red are for Annual Model Maintenance * Workshop meeting with the City Maintain City s Wastewater Model Similar to Water Model Slide #12
13 Database Integration (Everything Talking to Everything) Sewer Model - GIS (GeoDatabase) - CMMS (Maximo) Common Unique Identifiers Slide #13
14 4. Model Calibration and Design Storm Development Conduct dry weather calibration Use EPA-recommended RTK Hydrograph Method for wet weather calibration Develop Design Storm using Return Period & Storm Intensity (e.g. short 5-year, 3-hour cloudburst event for basins and 5-year, 24-hour events for system wide) based on Level of Service recommendations Slide #14
15 5. Existing System Analysis & Short-Term Needs Evaluation Immediate Critical Issues Peak wet weather flow issues in system and at Village Creek WWTP (third siphon) Impact of Trinity River Vision redevelopment and utility relocation Programming and phasing of short-term CIP expenditures Reporting required for SSO Initiative participation Approach used successfully in Water Master Plan Slide #15
16 6. Population and Wastewater Flow Projections Leverage Water Master Plan Demographic Data Large-user billing data from Water Master Plan Population projections from NCTCOG Project Wholesale Needs Overlay data with sewer basins & subbasins by planning period FNI Knowledge of Recent Tremendous Growth Occurring with Fort Worth Slide #16
17 7. Future System Improvement Analysis for 5, 10 and 25 Years Future System Improvements Alternatives Optimize wastewater system conveyance capacity with need for future Mary s Creek WWTP Identify approach to serve undeveloped areas within 5- year, 10-year and 25-year service areas Identify flow and date triggers when major interceptors upgrades are needed for retail & wholesale growth Slide #17
18 8. Treatment Facilities Capacity Planning Short & Long Term Capacity Needs at Village Creek WWTP Average flow rate and 75/90 rule Existing peak flows & impact of new third siphon Incremental capacity cost Timing & Location of Satellite WWTP(s) Identify lowest cost solution to meet system capacity needs Other issues: compact, permitting, reuse Monthly Flows (w/ 2 siphons) Slide #18
19 9. Risk-Based Assessment Planning Assign Renewal Condition Scores Field condition data (pipelines and discrete assets) Fort Worth operating staff knowledge and inspection data Age and material Based on WRc methodology customized to Fort Worth situation Assign Capacity Condition Scores Based on level of service customized to Fort Worth decisions Risk Rating = Condition x Consequence Consequence of Failure Score (criticality) Low Impact Medium Impact High Impact Risk Rating = Condition x Consequence Consequence of Failure Score (criticality) Low Impact Mediu m Impact High Impact Renewal Condition Score (probability of failure) Very Good Good Fair Poor Very Poor Capacity Condition Score (probability of overflow) Very Low Low Medium High Very High Slide #19
20 9. Risk-Based Assessment Planning Assign Consequence of Failure Scores Potential Economic Impact Highway, rail, business districts Potential Environmental Impact Creek or lake, large volume of wastewater Potential Social/Public Health Impact High visibility, near schools, hospitals, disruption of service Set Up Tool/Program for Fort Worth to Maintain Going Forward Condition x Consequence = Prioritized Risk Rating Slide #20
21 10. Redevelopment Planning Review and update sewer design criteria Identify 10 Redevelopment Focus Areas Develop Sewer Plans for underserved areas to facilitate redevelopment Slide #21
22 11. Comprehensive Capital Improvement Program (CIP) - Costs of growth & renewal improvements - Phasing of projects by Category, Funding Source, and Fiscal Year Slide #22
23 Overall Project Schedule (2 Years) Strategic Planning Portion (6 Months) Ongoing communication with TCEQ to meet SSO Initiative Deadline Slide #23
24 Wastewater System Master Plan and SSO Initiative Discussion
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