Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study
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1 Sanitary Sewer Flow Monitoring and Inflow/Infiltration Study 2016/2017 Results & 2017/2018 Plan May 2, 2018 Angel Mejia, P.E., Project Manager Oliver Pohl, P.E., Sr. Project Engineer Nicole Kwan, P.E., Associate Engineer
2 Purpose 1. Establish baseline sanitary sewer flows 2. Estimate sewer capacity 3. Isolate I/I response and perform I/I analysis 4. Recommendations for Future I/I Investigations, Identification and Mitigation
3 Seasonal Plan /2016: Basins 3, 4 and /2017: Basins 7 and /2018: Basin /2019: Basins 24 and 26
4 Basins 7 and 8 Legend Top 6 Summary Top 6 Basins: GWI Top 6 Basins: INFLOW Top 6 Basins: RDI Top 6 Basins: Combined I/I Note: Basin 3/4 drawn in for this proposal per the figure provided in the RFP Background: 2012 I/I Study by V&A for Carollo master plan Top Six Basins for Various RDII Parameters
5 12-Dec 28-Dec 13-Jan 29-Jan 14-Feb 2-Mar 18-Mar 3-Apr 19-Apr 5-May 21-May 6-Jun 22-Jun Rain (inches per hour) Monitoring Period December 2016 to June Rainfall Events 1.40 Total Rainfall over Period: inches 1.20 Event 2: 4.55 inches Event 1: 8.01 inches Event 3: 6.25 inches Event 4: 4.17 inches Event 5: 2.77 inches Event 6: 3.24 inches
6 12-Dec 19-Dec 26-Dec 2-Jan 9-Jan 16-Jan 23-Jan 30-Jan 6-Feb 13-Feb 20-Feb 27-Feb 6-Mar 13-Mar 20-Mar 27-Mar 3-Apr 10-Apr 17-Apr 24-Apr 1-May 8-May 15-May 22-May 29-May 5-Jun 12-Jun 19-Jun 26-Jun Rain (inches) Rainfall 99% above historical normal levels 40.0 Period Rainfall Historical Average
7 Inches of Rain Inches of Rain Storm Event Classification All classifiable /2/17-1/12/17 1/18/17-1/23/17 2/2/17-2/9/17 2/16/17-2/21/17 3/20/17-3/26/17 4/6/17-4/20/ February 2-9, 2017: 4-Year, 14-Hour January 2-12, 2017: 5-Year, 10-Day hr 2-hr 3-hr 6-hr 12-hr 24-hr 1/2/17-1/12/17 1/18/17-1/23/17 2/2/17-2/9/17 2/16/17-2/21/17 3/20/17-3/26/17 4/6/17-4/20/17 Season 0 1-day day 10-day 20-day 30-day 45-day 60-day
8 1. Baseline Flow 4 distinct flow curves for each site Site 8G 0.90 Weekdays (Mon-Thu) Friday Saturday Sunday Hour
9 2. Capacity - ADWF
10 2. Capacity Peak Flow N Legend Site Name 1.03 Peak Flow (mgd) Peak Level (Red for Surcharged, d/d) Overflow Line Cross Connection
11 3. Inflow/ Infiltration Roof Vent... Manhole Cover with Holes Deteriorated Manhole Exfiltration from Storm Sewer Tree Root Penetration Area Drain connected to Lateral Deteriorated Lateral Downspout connected to Lateral Cracked or Damaged Pipe Cross-connection from Storm Catch Basin Faulty Lateral Connection to Sanitary Sewer
12 Inflow Ranking Legend Subbasins INFLOW Ranking Rank 1 2 (Top 25%) Rank 3 4 Rank 5 6 Rank 7 8 (Lower 25%)
13 RDI Ranking Legend Subbasins RDI Ranking Rank 1 2 (Top 25%) Rank 3 4 Rank 5 6 Rank 7 8 (Lower 25%)
14 Combined I/I Ranking Legend Subbasins Total I/I Ranking Rank 1 2 (Top 25%) Rank 3 4 Rank 5 6 Rank 7 8 (Lower 25%)
15 Notable Findings 1. All sites, except 8A & 8B, had peaking factor > In general, Basin 7 had worse flow conditions: All Basin 7 sites, except 7G, had d/d >5. Max d/d (Site 7D) was 12.7 Only two Basin 8 sites had d/d > 5: 8C1 & 8F Overflow lines from Basin 8 to Basin 7 did not get fully activated 3. Basin 7A: 2nd for normalized inflow 1st for normalized RDI and combined I/I.
16 Notable Findings 4. Peak Flow Event February 7, 2017
17 Recommendations Capacity Restrictions Site 7E/7F: 8.5 feet peak level (SSO potential). Possible Bottlenecks: Basin 7 trunk line between sites 7F and 7G at Market Avenue and 13th St. Basin 8 trunk line between site 8D/8E and site 8F/8G; on Dover Avenue between 14th St and Tyler St between site 7G and the last cross-connection between basin 7F and 7G, on 13th St between Post Avenue and Sutter Avenue.
18 Recommendations Further I/I investigation or prioritization nighttime reconnaissance work smoke testing Basin 7A Basins 8F ranked 1 st for inflow Basins 7F+7G ranked 2 nd for RDI and combined I/I
19 Focus I/I Reduction Efforts 1. Chesley Avenue South: clear trend of high I/I being contributed from Chesley Avenue moving south (Basins 3D, 3E, 3F, 3G, 6A). Chesley Ave.
20 Focus I/I Reduction Efforts 2. Basin 4E: Fairly significant and sustained I/I contribution given the service area. Basin Flows are conveyed away from lines with capacity issues, so future I/I reduction efforts within this area may be less urgent but still should be considered for overall system I/I reduction. Peak I/I Rate (mgd) Inflow Ranking RDI Ranking Combined I/I Ranking 4E F
21 I/I Investigation Methods Nighttime reconnaissance work Basins 3D, 3E, 3F, 3G, 4E and 6A V&A performed 1 night of I/I reconnaissance
22 I/I Investigation Methods Nighttime reconnaissance work Observations (Basin 3/6) Clear Water Flow Infiltration below VCP Inlet (MH Clear water flow (MH )
23 I/I Investigation Methods Nighttime reconnaissance work Observations (Basin 4) Clear Water Flow Infiltration from pipe joint upstream of manhole (MH 12) EBMUD Facility upstream of MH
24 I/I Investigation Methods Nighttime reconnaissance work Observations (Basin 4) Clear Water Flow * - Flow rate estimated from maximum measured rate of 168 gpm
25 2017/2018: Basin 15 Legend Top 6 Summary Top 6 Basins: GWI Top 6 Basins: INFLOW Top 6 Basins: RDI Top 6 Basins: Combined I/I Note: Basin 3/4 drawn in for this proposal per the figure provided in the RFP Background: 2012 I/I Study by V&A for Carollo master plan Top Six Basins for Various RDII Parameters
26 2016/2017: Basins 7, and 8 Flow Monitoring 11 Flow Meters 11 Isolated Basins 10 Individual Manholes
27 2017/2018: Basin 15
28 2017/2018: Basin 15
29 20-Dec 5-Jan 21-Jan 6-Feb 22-Feb Rain (inches per hour) 2017/2018: Basin 15 Rainfall 0.60 Total Rainfall over Period: 6.59 inches 0.45 Event 1: 3.06 inches Event 3: 2.08 inches 0.30 Event 2: 2.44 inches
30 Flow (mgd) Rain (in/hr) Depth (in) 2017/2018: Basin 15 Site 15A Wed Thu Fri Sat Sun Mon Tue 6.0 Peak: 5.23 in Low: 0.66 in Ave: 1.86 in Peak: mgd Low: mgd Ave: mgd Jan 4-Jan 5-Jan 6-Jan 7-Jan 8-Jan 9-Jan
31 Flow (mgd) Rain (in/hr) Depth (in) 2017/2018: Basin 15 Site 15B Wed Thu Fri Sat Sun Mon Tue 9 Peak: 7.85 in Low: 3.00 in Ave: 4.54 in Peak: mgd Low: mgd Ave: mgd Feb 1-Mar 2-Mar 3-Mar 4-Mar 5-Mar 6-Mar
32 Thank you
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