EPA SSOAP Toolbox Evolution and Applications
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1 EPA SSOAP Toolbox Evolution and Applications Presented by: Srini Vallabhaneni, P.E., BCEE CDM Smith Project Manager EPA Project Officer: Ari Selvakumar, Ph.D., P.E. Office of Research and Development National Risk Management Research Laboratory Water Supply and Water Resources Division Urban Watershed Management Branch, Edison, NJ Office of Research and Development National Risk Management Research Laboratory The National Center for Atmospheric Research Boulder, Colorado, USA September 24-26, 2012
2 Presentation Outline Aging Infrastructure Challenges EPA Research and Development SSOAP Applications Current Status and On-going Efforts Contact Information
3 Aging Wastewater Infrastructure Challenges in the United States Aging sewers - risk of failure; performance problems - sanitary sewer overflows (SSOs) some more than 100 years old more than 19,500 sanitary sewer systems serving 150 million people 50,000 sewer breaks/year 500,000 stoppages/year 75% of sewers operating at 50% capacity or less 40,000 SSO events/ year
4 Prime Culprit of SSO Rainfall Derived Infiltration and Inflow (RDII) that causes flows to exceed sewer capacity from: Poor sewer maintenance - root intrusion, grease build up, debris Aging sewers - defective joints, lines, manholes, missing manhole covers
5 EPA Research and Development ( ) R&D goal - develop guidance and tools: methodology for assessing RDII Sewer capacity and conditions assessment tools SSO mitigation plans SSO CRADA (Cooperative Research and Development Agreement) EPA CDM Smith
6 Components of Wet-weather Wastewater Flow GWI Ground Water Infiltration f (season, river flow, tides) 2 0 Precipitation BWF Base Wastewater Flow f (pop, land use) Flow F L O W RDII RDII Rainfall Derived Infiltration and inflow f (rain, AMC) BWF GWI 0 : : : : : : : : : : : : : : : : : : : : : : : Time TIME (hours)
7 Collection System Components & Infiltration/Inflow Sources Illegal Foundation drains (Inflow/infiltration) Office of Research and Development National Risk Management Research Laboratory
8 CRADA Outcomes Technical Report #1 EPA Report, EPA/600/R-08/010, Jan 2008 Website link: mrl/pubs/600r08010/6 00r08010.pdf Provide a literature review of RDII prediction methods and selection of the RDII method for SSOAP
9 EPA Report, EPA/600/R- 07/111, Oct Website link: s/600r07111/600r07111.pdf CRADA Outcomes Technical Report #2 A reference report for SSOAP users An independent national technical panel provided critical review of the Toolbox and technical report
10 CRADA Outcomes SSOAP Toolbox
11 What is SSOAP Toolbox? The SSOAP Toolbox contains a suite of computer software tools It is designed to assist SSO communities to: Assess sanitary sewer capacity problems, and develop mitigation solutions Prioritization of subareas to perform field investigations for sewer condition assessment Assess post-rehabilitation RDII
12 Overview of SSOAP Toolbox Sewer System GIS Database Flow Monitoring Data Rainfall Data Database Management Tool SSO Analysis & Planning RDII Analysis Tool (Unit Hydrograph Parameters) RDII Hydrographs Generation Tool Other RDII Tools SWMM 5 (Sewer Flow Routing) SSOAP-SWMM 5 Interfacing Tool Other Hydraulic Model Engines
13 Research and Development (2009 ongoing)
14 SSOAP Enhancements: Addition of Condition Assessment Support Tool Sewer System GIS Database Flow Monitoring Data Rainfall Data Database Management Tool SSO Analysis & Planning RDII Analysis Tool RDII Hydrographs Generation Tool Condition Assessment Support Tool Other RDII Tools SWMM 5 (Sewer Flow Routing) SSOAP-SWMM 5 Interfacing Tool Other Hydraulic Model Engines
15 SSOAP Enhancements Condition Assessment Support Tool Objectives are to create a dedicated tool for: Developing priorities among different sewersheds and sub-sewersheds for designing a focused field investigation plan and subsequent sewer rehabilitation plan Assessing effectiveness of sewer rehabilitation programs using pre- and post-rehabilitation RDII correlations
16 SSOAP Synthetic Unit Hydrograph Method 2 0 Precipitation FIRST UNIT SSOAP Tool HYDROGRAPH Box OF initially employs the R Synthetic 1, T Unit 1, AND K Hydrograph 1 RESULTING FROM approach P TOTAL RDII HYDROGRAPH RAINFALL, P FLOW RDII RTK Method used SECOND in EPA UNIT SWMM is the most HYDROGRAPH OF popular SUH method R 2, T 2, AND K 2 T HIRD UNIT RDII Uses three triangular unit hydrographs to represent R 3, T 3, AND K 3 how rainfall contributes to RDII BWF HYDROGRAPH OF T1 T2 T1+K1*T1 T3 GWI T2+K2*T2 TIME 1: : : : : : : : : : : : : : : : : : : : : : Time R: Percentage of rainfall that enters the sanitary sewer as RDII T: Time to the peak flow K: Ratio of the time to recession to the time to peak T3+K3*T3
17 SSOAP Applications
18 RDII Assessment Range of RDII Event No. Start Date/Time Total Volume (in) Duration (hr) Peak Intensity (in/hr) AMC (Days) 10-day Antecedent Rainfall volume (in) Return Period (based on total volume) Total R R1 R2 R3 T1 T2 T3 K1 K2 K3 1 April 22, year 9.2% 1.0% 2.2% 6.0% April 26, < 2-month 5.0% 1.0% 1.0% 3.0% May 11, < 2-month 1.3% 0.2% 0.5% 0.6% May 13, < 2-month 3.0% 0.5% 1.2% 1.3% May 19, < 2-month 2.5% 0.5% 0.9% 1.1% May 19, < 2-month 2.9% 0.5% 1.0% 1.4% June 11, < 2-month 4.3% 0.7% 1.5% 2.1% June 28, month 4.8% 1.0% 1.3% 2.5% June 29, < 2-month 2.8% 0.5% 1.1% 1.2% July 16, < 2-month 2.2% 0.4% 0.7% 1.1% July 16, year 5.3% 1.5% 1.6% 2.2% July 21, year 6.2% 1.5% 1.5% 3.2% Inflow 0.5-4% 6-19% 2-9% Infiltration
19 Sewer System Modeling - Alternative Improvement Analysis Overflow
20 Capacity Assessment and Assurance Before After
21 Sewer Condition Assessment and Rehabilitation Prioritization Range of RDII Range of RDII Prioritized subareas to perform field investigations to assess sewer condition and subsequent rehabilitation 0.5-4% 2-9% 6-19% Inflow (R1) Infiltration (R3) Prioritization by: Total RDII Inflow Infiltration
22 Sewershed Comparisons with Relative Inflow and Infiltration Contributions
23 Field Investigation Priorities Varying Metrics
24 Focused Field Investigations SSOAP Toolbox designed to assist prioritizing portions of the sewer systems and help select proper I/I investigation tools Save program $$ Collect meaningful data
25 Post-Rehabilitation RDII Assessment RDII Assessment of pre and post rehabilitation conditions Pre-Rehab RDII Determination of incremental efforts needed to meet capacity assurance goals 0.5-4% 6-19% 0.5-3% 3-9% 2-9% Post-Rehab RDII 1-4%
26 Confirmation of Rehabilitation Effectiveness (Correlation of RDII Between Rehab and Control Sub-basins) Control Area WWTP Rehabilitation Monitor R Value Flow Monitor Rain Gage Rehab Area Control Monitor R Value
27 SSOAP R&D Status and Ongoing Efforts : SSOAP training workshops Provide users support Enhance SSOAP to facilitate condition assessment applications Condition Assessment Support Tool Technical Report: SSOAP Enhancements and Case Study
28 For information on research and tools: Dr. Ari Selvakumar, EPA Srini Vallabhaneni, CDM Smith Technical support team Thank You
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