an i/i investigation · 2018. 9. 6. · sso reduction o upsize o re-route o store o reduce peak...
TRANSCRIPT
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© 2015 HDR, Inc., all rights reserved.
A tail of two systemsAn I/I investigation
MARTINEZ CREEK WATERSHED
System
SanAntonioWater
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SSO Reduction Program Consent Decree CIP required? SSO Reductiono Upsizeo Re-routeo Storeo Reduce peak flows
BACKGROUND
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> 7,000 nodes> 7,000 pipes> 43,000 subcatchments
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Literature is general and inconclusive Remediation methods can be system
specific Needed to identify root cause for our
specific Inflow and Infiltration
IDENTIFYING THE PROBLEM
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Calibrated well to discrete events Difficulty calibrating to back to back events
or wet antecedent conditions
EXAMPLE FLOW METER SC12A
1.125 15.382 7.707
Other Nov 2014 Event
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Urbanized 5 flow meters Sewer follows creek Creek heavily engineered
MARTINEZ CREEK WATERSHED
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Downstream of three flow meters Flow meter in a manhole located in the
creek Calibrated well to smaller events Has “strange” blips for larger, more intense
events Has high parameters compared to
surrounding meters
What is causing this excessive RDII?
FLOW METER CS41
FlowMin (MGD)
Observed...) 2014 Radar May to Nov
Max (MGD)Observed...) 2014 Radar May to Nov
Volume (US Mgal)Observed...) 2014 Radar May to Nov
1.488 15.297 8.4421.#IO -1.#IO 0.0001.125 15.382 7.707
FlowMin (MGD)
Observed) 2014 Radar May to Nov
Max (MGD)Observed
) 2014 Radar May to Nov
Volume (US Mgal)Observed
) 2014 Radar May to Nov
2.062 22.687 23.4421 124 16 196 18 156
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Sewer in the creek Cross connections Poor condition of pipes and manholes Maintenance (manhole lids) Other…
SOURCES OF RDII?
Location Flow Meter
CS41
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Walk the creek
Numerous problems found Damaged manhole Pipes visible in creek Visible cracks in pipe
FIELD INVESTIGATION
Location Flow Meter
CS41
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Issue 1Manhole Damaged
Issue 2Manhole Frame and
Cover Damaged
Issue 3Pipe in Creek with
Holes at Pipe Joints
Issue 4Pipe in Creek with no
Encasing
FIELD SURVEY FINDINGS
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Built device to conduct laboratory testing of submerged manholes Manholes are leaky Manhole type affects leakiness Maintenance affects leakiness A governing equation developed for each
type of manhole
Commonly used / recommended manhole lids used within the SAWS system found to be
‘most leaky’
MANHOLE TESTING
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Problem Area Field Survey Categorize Issues Manhole Testing
CS41 has CA/6 making TA/CA ~ 3% closer to area average – TA/CA was 19%
TA = Total AreaCA = Contributing Area
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All major rivers and creeks modeled in HEC-RAS
Originally imported to IWRS Later converted to ICM Upper San Antonio River West Side Creeks including Martinez Creek Continual Simulation Hydrology
CREEK MODELS IN ICM
LegendOlmos CreekAlazan CreekWoodlawn East SDWoodlawn West SDApache CreekApache TributaryMartinez CreekSan Pedro CreekZarzarmora CreekZarzarmora TributaryConcepcion CreekRockwood CreekState Hospital CreekSan Antonio RiverSub-Basin Boundary
IWRS
ICM
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USGS Flow Gauge on San Pedro Creek downstream of Martinez CreekCALIBRATED TO USGS FLOW GAUGE DATA
San P
edro
Cre
ek
RainfallDepth (in)
RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
Peak (in/hr)RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
Average (in/hr)RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
DepthMin (ft)
RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
Max (ft)RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
FlowMin (ft3/s)
RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
Max (ft3/s)RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
Volume (ft3)RainObservedNEXRAD PDM>5 minNEXRAD SCS>5 min
5.377 3.251 0.08912.800 13600.000 172264581.2610.600 12.15027.632 14251.438 182248919.09227.634 28308.443 417485800.531
0.440 9.4310.440 14.062
Observed Stage and FlowStandard Discrete Hydrology Continual Simulation Hydrology
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One ICM SE model of the Sanitary Sewer – subsurface One ICM model of the Creeks – surface How to join?
COMBINING MODELS
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Cross-Connecting Sewer and Surface Flow ModelsINTEGRATED CATCHMENT MODEL
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Adjusted RDII Parameters to neighboring averages
Connected Broken Manhole Connected Major DefectsConnected Manholes to Open Channels
Modeled as an Orifice• Level = 646.5• Diameter 0.8 ft• 0.8/0.45 co-eff (weir/orifice)And Sluice Gate• Level = 647.5• Width 1.0 ft• Height 0.5 ft• 0.45/0.3 co-eff (weir/orifice)
Modeled as a Sluice Gate• Level = creek bed• Width 1 ft• Height 0.05 ft• 0.3 co-eff
Modeled as Weirs• Crest = MH GL• Width 0.1 ft for leaky
(1 ft for lid blown off)• Height 0.1 ft or leaky
(0.5 ft for lid blown off)• 0.85/0.7 co-eff (weir/orifice)
0
20
40
60
80
100
120
1 13 25 37 49 61 73 85
Model InflowsEqu 1 InflowsEqu 2 InflowsEqu 3 InflowsEqu 4 InflowsEqu 5 InflowsEqu 6 InflowsEqu 8 InflowsEqu 9 Inflows
Adjusted RDII parameters to average of surrounding areas
Linked manhole to surface channel cross sections by an orifice or sluice gate
Model run and manhole leakiness compared to tested values.
Major defects then calibrated
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Significant manhole submergenceMARTINEZ CREEK PROFILE
Manhole cross-connections
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CS41 – Flow meter upstream of major defectsIMPROVEMENT IN CALIBRATION
RainfallDepth (in)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Peak (in/hr)RainObserved...er Flow survey 2016...2 Flow survey 2016
Average (in/hr)RainObserved...er Flow survey 2016...2 Flow survey 2016
DepthMin (ft)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Max (ft)RainObserved...er Flow survey 2016...2 Flow survey 2016
FlowMin (MGD)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Max (MGD)RainObserved...er Flow survey 2016...2 Flow survey 2016
Volume (US Mgal)RainObserved...er Flow survey 2016...2 Flow survey 2016
VelocityMin (ft/s)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Max (ft/s)RainObserved...er Flow survey 2016...2 Flow survey 2016
8.320 3.120 0.0211.410 21.296 106.4880.694 2.798 1.530 5.3601.212 20.147 79.5461.120 17.820 67.012
0.465 11.1380.449 7.413
1.399 5.6891.609 5.607
More about this later
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CS64 – Flow meter downstream of major defectsIMPROVEMENT IN CALIBRATION
RainfallDepth (in)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Peak (in/hr)RainObserved...er Flow survey 2016...2 Flow survey 2016
Average (in/hr)RainObserved...er Flow survey 2016...2 Flow survey 2016
DepthMin (ft)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Max (ft)RainObserved...er Flow survey 2016...2 Flow survey 2016
FlowMin (MGD)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Max (MGD)RainObserved...er Flow survey 2016...2 Flow survey 2016
Volume (US Mgal)RainObserved...er Flow survey 2016...2 Flow survey 2016
VelocityMin (ft/s)
RainObserved...er Flow survey 2016...2 Flow survey 2016
Max (ft/s)RainObserved...er Flow survey 2016...2 Flow survey 2016
1.660 1.440 0.0042.344 100.955 201.6610.629 4.532 0.815 11.0393.782 44.064 188.0503.783 42.581 177.324
0.705 2.4150.705 2.372
3.674 7.8423.674 7.749
More about this later
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Upstream meters show that the RDII from the creek causes backwater upstreamCREEK INFLOW AND INFILTRATION EFFECTS UPSTREAM
FlowMin (MGD)
ObservedJuly 17 2014.5 4 Base runs>July 17 to 18 2014...-C CS41>CC - CS41 CA/6 + Crk X mods July 17 to 18 2014
Max (MGD)ObservedJuly 17 2014.5 4 Base runs>July 17 to 18 2014...-C CS41>CC - CS41 CA/6 + Crk X mods July 17 to 18 2014
Volume (US Mgal)ObservedJuly 17 2014.5 4 Base runs>July 17 to 18 2014...-C CS41>CC - CS41 CA/6 + Crk X mods July 17 to 18 2014
0.165 5.560 1.5990.233 6.118 1.9340.233 5.418 1.934
Model simulations during calibration shows tailwater effects
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Peak flow estimated and checked against observed depthSOME METERS HAD ISSUES WHEN SURCHARGED
DepthMin (ft)
Observed... FM Investigation DWF... FM Investigation DWF... FM Investigation DWF
Max (ft)Observed... FM Investigation DWF... FM Investigation DWF... FM Investigation DWF
FlowMin (MGD)
Observed... FM Investigation DWF... FM Investigation DWF... FM Investigation DWF
Max (MGD)Observed... FM Investigation DWF... FM Investigation DWF... FM Investigation DWF
Volume (US Mgal)Observed... FM Investigation DWF... FM Investigation DWF... FM Investigation DWF
VelocityMin (ft/s)
Observed... FM Investigation DWF... FM Investigation DWF... FM Investigation DWF
Max (ft/s)Observed... FM Investigation DWF... FM Investigation DWF... FM Investigation DWF
1.264 19.985 41.9861.320 12.638 0.400 5.941-16.602 25.030 41.966-16.602 25.030 50.0771.283 19.568 50.082
0.420 9.7680.420 10.7200.420 1.853
-4.055 6.740-4.055 6.7403.457 7.162
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Assessing magnitude of RDII
How much RDII is likely from Creek intrusion?
Fixing Defects:Incremental improvement in system. At what point do you see improvements?
Removing line from Creek:
Reduction in RDII
HOW THIS WAS USED – 5 YEAR 6 HOUR ANALYSIS EVENT
0
5
10
15
20
Broken Manhole
Flow
Rainfallpth (in)
Peak (in/hr)
Average (in/hr)
FlowMin (MGD)
Max (MGD)
.180 6.120 0.0911.979 11.4561.177 22.0141.177 22.4261.177 22.4991.177 20.9181.177 20.1021.128 18.828
ed
2014 Radar CS64>SCS July 17 to 18 2014SCS + 13692 surface-sewer July 17 to 18 2014>SCS+13692 s-s recal CS62 July 17 to 18 2014
rtinez>SCS surface-sewer July 17 to 18 2014 >SCS-13692 s-s recal CS62 July 17 to 18 2014
ed
2014 Radar CS64>SCS July 17 to 18 2014SCS + 13692 surface-sewer July 17 to 18 2014>SCS+13692 s-s recal CS62 July 17 to 18 2014
rtinez>SCS surface-sewer July 17 to 18 2014 >SCS-13692 s-s recal CS62 July 17 to 18 2014
ed
2014 Radar CS64>SCS July 17 to 18 2014SCS + 13692 surface-sewer July 17 to 18 2014>SCS+13692 s-s recal CS62 July 17 to 18 2014
rtinez>SCS surface-sewer July 17 to 18 2014 >SCS-13692 s-s recal CS62 July 17 to 18 2014
Flow meter dataCalibrated Model
Calibrated model with x-link to creek modelTweaked Cal of CS62 and CS41 with x-link to creek
Tweaked Cal with Full x-link to creek modelTweaked Cal with x-link removed
ObservedBaseHole fixedPipe fixed½ MH fixedAll MH fixedSystem tightened
Flow (MGD)11.45622.01422.42622.49920.91820.10218.828
Min (MGD)
1.9793.2372.7432.7433.2374.4443.3012.808
Effect on CIP work if not addressed:
Creating capacity downstream allows more inflow from creek
Flow meter dataCalibrated Model
Calibrated model CIP D/SRun 2Run 3Run 4
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CS14 and CS15 in the Martinez Creek WatershedMICRO-CALIBRATION USING GROUND WATER INFILTRATION
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Identifying excessive RDII areas Two chosen are in the Martinez Watershedo CS14o CS15
Documented history of SSOso Number of SSOs significantly higher than system
average Flow monitor peaking factor analysis indicated
clear wet weather response Model calibration parameters higher than average
MICRO-CALIBRATION
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Model calibrates well to discrete events but not so well to back to back eventsMICRO-CALIBRATION
RainfallDepth (in)
RainObserved...alSpine_0%>CS14 (FNI CSSE) DWF
t h t NEXRAD 5 2015 2017
Peak (in/hr)RainObserved...alSpine_0%>CS14 (FNI CSSE) DWF
t h t NEXRAD 5 2015 2017
Average (in/hr)RainObserved...alSpine_0%>CS14 (FNI CSSE) DWF
t h t NEXRAD 5 2015 2017
FlowMin (MGD)
RainObserved...alSpine_0%>CS14 (FNI CSSE) DWF
t h t NEXRAD 5 2015 2017
Max (MGD)RainObserved...alSpine_0%>CS14 (FNI CSSE) DWF
t h t NEXRAD 5 2015 2017
Volume (US Mgal)RainObserved...alSpine_0%>CS14 (FNI CSSE) DWF
t h t NEXRAD 5 2015 2017
2.689 2.403 0.0280.076 0.622 0.8790.056 0.204 0.5130 057 0 497 0 655
Rainfall
Depth (in)
RainObserved...I CSSE) DWF...m 2015-2017
Peak (in/hr)
RainObserved...I CSSE) DWF...m 2015-2017
Average (in/hr)
RainObserved...I CSSE) DWF...m 2015-2017
Flow
Min (MGD)
RainObserved...I CSSE) DWF...m 2015-2017
Max (MGD)
RainObserved...I CSSE) DWF...m 2015-2017
Volume (USMgal)
RainObserved...I CSSE) DWF...m 2015-2017
1.902 3.640 0.1270.086 1.248 0.1790.056 0.204 0.0770.057 1.291 0.202
Rainfall
Depth (in)
RainObserved...FNI CSSE) DWF... 5m 2015-2017
Peak (in/hr)
RainObserved...FNI CSSE) DWF... 5m 2015-2017
Average (in/hr)
RainObserved...FNI CSSE) DWF... 5m 2015-2017
Flow
Min (MGD)
RainObserved...FNI CSSE) DWF... 5m 2015-2017
Max (MGD)
RainObserved...FNI CSSE) DWF... 5m 2015-2017
Volume (USMgal)
RainObserved...FNI CSSE) DWF... 5m 2015-2017
3.349 2.166 0.1240.062 1.447 0.4360.056 0.204 0.1360.056 1.260 0.342
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CS14_01
CS14_02
CS14_03
CS14_04
CS14_05
CS14_06
CS14_07
Applying Ground Infiltration module to fill in
Applying Ground Infiltration module to fill in
Applying Ground Infiltration module to fill in
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INFILTRATION ZONEInitial calibration indicated that the highlighted area (CS14_02, CS14_05 and CS14_06) shows signs of increased infiltration for longer events.
RainfallDepth (in)
RainObserved...ralSpine_0%>CS14 (FNI CSSE) DWF...Catchment NEXRAD 5m 2015-2017
Peak (in/hr)RainObserved...ralSpine_0%>CS14 (FNI CSSE) DWF...Catchment NEXRAD 5m 2015-2017
Average (in/hr)RainObserved...ralSpine_0%>CS14 (FNI CSSE) DWF...Catchment NEXRAD 5m 2015-2017
FlowMin (MGD)
RainObserved...ralSpine_0%>CS14 (FNI CSSE) DWF...Catchment NEXRAD 5m 2015-2017
Max (MGD)RainObserved...ralSpine_0%>CS14 (FNI CSSE) DWF...Catchment NEXRAD 5m 2015-2017
Volume (US Mgal)RainObserved...ralSpine_0%>CS14 (FNI CSSE) DWF...Catchment NEXRAD 5m 2015-2017
2.697 2.403 0.0230.055 0.622 0.9960.056 0.204 0.6360.056 0.497 0.772
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Source: Innovyze help topic “Ground Infiltration Model”
Rainfall runoff has three model components: • initial loss (depression storage)• runoff volume • runoff routingIncident rainfall is initially stored in surface depressions, which are subject to evaporative loss (defined in the rainfall event).
When rainfall exceeds depression storage in a given time step, a proportion of the excess rainfall goes to runoff according to the particular volume model used. The remaining rainfall is directed into the soil storage reservoir (1).
When the soil reaches a given saturation threshold (the percolation threshold - 2), water starts to percolate downwards. A proportion of this percolation flow (the percolation percentage infiltrating - 3) infiltrates directly into the network while the remainder penetrates deeper to feed the groundwater storage reservoir (4).
Note that the volume in the soil storage reservoir is also subject to evapotranspiration, though at a reduced rate.
The Ground Store will effectively be turned off and not influence the results
RUNOFF + GROUND INFILTRATION(SOIL STORE)
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Percolation threshold Percolation coefficient
Percolation percentage infiltrating
Infiltration coefficient Infiltration threshold type Infiltration threshold level (ft / ft AD)
Baseflow coefficient Baseflow threshold type Baseflow threshold level (ft / ft AD)
Evapotranspiration type Evapotranspiration depth (ft)
Porosity of soil Soil depth (ft)
Porosity of ground
(Value)(1 – Value)
Runoff (RDII)
Infiltration to Soil Store
Loss to Baseflow(losses from groundwater store that do not enter drainage network)
Ground Store Inflow
Soil Store InflowSoil Store Depth
Ground Store LevelGround Water Inflow
=Soil Store Inflow
+Ground Store Inflow
Infiltration to Ground Store
Surface Hydrology
Ground Store
Soil Store
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Confirm the surface hydrology RDII parameters for maximum effecto VPR (Wallingford with Variable Percentage Runoff – NewUK Soil Depth)o Soil Type Set (1 - 4) o Evaporation Set (recommend monthly profile)o API Set (Antecedent Precipitation Index – use software)
NOT JUST GWI
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March 2018MORE INFLOW AND INFILTRATION THAN EXPECTED
0.68 in 0.037 MG
0.88 in 0.241 MG
0.73 in 0.344 MG
0.83 in 0.29 MG
RainfallRDII
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2018 rains with increased RDII responseTHEN TO ADD TO THE PROBLEM
RainfallDepth (in)
RainObserved...ment NEXRAD 5m 2017-2018 Evap...ment NEXRAD 5m 2017-2018 Evap
Peak (in/hr)RainObserved...ment NEXRAD 5m 2017-2018 Evap...ment NEXRAD 5m 2017-2018 Evap
Average (in/hr)RainObserved...ment NEXRAD 5m 2017-2018 Evap...ment NEXRAD 5m 2017-2018 Evap
FlowMin (MGD)
RainObserved...ment NEXRAD 5m 2017-2018 Evap...ment NEXRAD 5m 2017-2018 Evap
Max (MGD)RainObserved...ment NEXRAD 5m 2017-2018 Evap...ment NEXRAD 5m 2017-2018 Evap
Volume (US Mgal)RainObserved...ment NEXRAD 5m 2017-2018 Evap...ment NEXRAD 5m 2017-2018 Evap
26.209 4.533 0.0030.000 1.513 20.4950.021 0.711 20.1430.021 0.880 21.051
CS14_01
Micro-calibration parametersMicro-calibration parameters plus Ground Infiltration Module
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• Modeling results are directing the extent and prioritization of pipeline renewal efforts
• Results showing the degree of improved Level of Service identified in these pilot remediation basins are to be used as benchmarks for other targeted remediation areas in the system
• Post renewal monitoring will be used for future model parameters (re-calibration)
OUTCOMES
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Matthew Schorsch, P.E.San Antonio Water SystemMaster [email protected]
THANK YOU
Anthony HenryAssociate / Senior Hydraulic ModelerHDR [email protected]