Upload
sweet-water
View
215
Download
0
Embed Size (px)
Citation preview
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
1/19
Wauwatosas I&I Challengesand Successes
Chris Stamborski, P.E. R.A. Smith National, Inc.
Bill Wehrley, P.E. City of Wauwatosa
April 25, 2013
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
2/19
City of Wauwatosa - Honey Creek Study Area History
MMSD Indicated Honey Creek study area exceeded the PeakWet Weather Flow Performance Standards
City Performed LSSES that included:
Sanitary SewerManholeInspections
Sanitary SewerTelevising andNASSCOPipelineConditionAssessment
Smoke Testing
Sanitary SewerFlow Monitoring
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
3/19
Honey Creek LSSES Conclusions
Flow Monitoring data indicated which areas of the HoneyCreek were reporting high flows Results of the manhole inspections, smoke testing, and standard CCTV
work did not account for the quantity of clear water that was enteringthe system
Honey Creek studyarea wasprioritized basedon results of
LSSES study
Recommendationswere given toaddress structuraldeficiencies inPublic Sector
system and lookfurther into waysto identifyclearwater entryfrom the PrivateSector
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
4/19
Flow Monitoring data indicated which areas of the Honey Creek werereporting high flows
Results of the manhole inspections, smoke testing, and standard CCTV work didnot account for the quantity of clear water that was entering the system
Honey Creek study area was prioritized based on results of LSSESstudy
Recommendations were given to address structural deficiencies inPublic Sector system and look further into ways to identify clearwaterentry from the Private Sector
City chose to perform surcharge dyewater testing of the storm sewer withinhigh flow areas in an attempt to identifysources of clearwater entry into thesanitary sewer system
Honey Creek LSSES Conclusions
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
5/19
Dye Water Flooding Overview
Traditional practice that hasproven to be an effective
method for a variety ofpurposes
In this practice, dye floodingis performed in conjunction
with CCTV to confirmpotential I/I sources thatwere identified as part ofother investigation methods
Dye water flooding aids in
verifying both the presenceand quantification of specificdefects during an evaluation
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
6/19
Dye Water Flooding Overview (cont.)
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
7/19
City of Wauwatosa Dye Flooding Project Examples
The following areexamples of standardCCTV performed as part
of the 2008 LSSESproject shown side-by-side with 2010 CCTV workdone with the dyeflooding project in theCity of Wauwatosa
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
8/19
Example: Clay Riser Lateral Leaking
2008 Standard CCTV 2010 Dye Flood CCTV
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
9/19
Example: Laterals Leaking after Relay of Entire Mainline Sewer
2008 Standard CCTV 2010 Dye Flood CCTV
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
10/19
Example: Mainline Joints and Lateral Leaking in Segmental PVC Relay
2008 Standard CCTV 2010 Dye Flood CCTV
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
11/19
Example: Lateral Leaking Adjacent to Storm Sewer CIPP Reline
2008 Standard CCTV 2010 Dye Flood CCTV
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
12/19
Dye Water Flooding Discharge
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
13/19
Honey Creek Study Area Dye Water Flooding Results
Approximately 80% of lateralscrossing mainline storm sewer
pipe had dye water witnessed
Approximately 974 gallons perminute of dyed water entering thesanitary sewer system Public 204 gpm (21%)
Private 770 gpm (79%)
Recommended Solutions Sanitary Sewer Lateral Rehabilitation
all the way to the foundation of thehouse
Sewer Manhole and MainlineRehabilitation
Need to be performed concurrently
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
14/19
Phase III Dye Testing for the City of Wauwatosa
Work Completed for
City in Fall 2010
~ 11,000 SanitarySewer CCTV withStorm Sewer DyeFlooded
~ 1,300 GPM Leaks 16% from Public
84% from Private
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
15/19
Phase IV Dye Testing for City of Wauwatosa
Work Completed forCity in Spring 2011
~ 70,000 SanitarySewer CCTV with
Storm Sewer DyeFlooded
~ 5,800 GPM Leaks 28% from Public
72% from Private
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
16/19
Watertown Plank Road Area Dye Testing for City of Wauwatosa
Work Completed forCity in Summer2011
~ 40,000 Sanitary
Sewer CCTV withStorm Sewer DyeFlooded
~ 1,120 GPM Leaks
38% from Public
62% from Private
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
17/19
WA4004 Sewershed Dye Testing for City of Wauwatosa
Work Completed forCity in Summer2011
~ 14,000 Sanitary
Sewer CCTV withStorm Sewer DyeFlooded
~ 234 GPM Leaks
25% from Public
75% from Private
D W t Fl di C l i
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
18/19
Dye Water Flooding Conclusions
Standard CCTV is very useful to determine the condition of theexisting sewer lines, but does not always show what is happeningduring high flow events
CCTV with dye water flooding will show where leaks are presentduring a simulated storm event
Majority of clear water that leaves the storm system and enters the
sanitary system does so through private laterals
Presence of storm laterals provides more exit and entry points formigration of water between storm system and sanitary systemthrough laterals and common trenches
Knowing where the leaks are located in your system will assist indetermining the most cost-effective means to reduce clearwaterentry into the system
City of Milwaukee | Environmental Engineering
7/30/2019 Workshop A: Wauwatosa's I&I Challenges and Successes Bill Wehrley and Chris Samborski
19/19
QUESTIONS???
City of Milwaukee | Environmental Engineering