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Home My WebLink About09.a. (PowerPoint) Flow Monitoring Update and Request for 2015-16 MonitoringATTACHMENT 1 Item No. 9.a. Flow Monitoring Update and Request for 2015 -16 Flow Monitoring September 17, 2015 Board Meeting Dan Frost, Senior Engineer Planning and Development Services I� Central Contra Costa Sanitary District District Modeling Background Steady State Model Sewer Steady State Model Enhanced Network Analysis Program SNAP & GIS Interface Dynamic Modeling (SNAP) (ArcSNAP) (InfoWorks) 1985 2003 2005> 2014 -15 151 Major Flow 2nd Flow 3'd Major Flow Monitoring Monitoring Monitoring (limited) Steady State Dynamic Model Calibration Pipe Age & Model Initial I/I Correlation Calibration 1 2014 -15 Flow Monitoring 'r Z t • 36 meters, 5 rain gauges, 9 weeks • Installed February 4 -6, 2015 • Gained valuable dry weather flow data for base wastewater flow rates • Identified some areas of high 1/1 • Improved planning for future metering • Limited data for initial wet weather model calibration • Lack of saturated soil conditions Feb 6 -8, 2015 Storm Event Precipitation (inches) 0.30 72 -hour total: 2.37" 0.25 0.20 0.15 0.10 0.05 0.00 1:28pm Fri 1:28am Sun 1:21 1 -hr PHWWF Peaking Factors Ranged from 1.7 to 9.2 110 MGD into WWTP V\\) Lb /Ni!om LWia:3 ix:00 ](� /YJls nun U.aoisum yvimsoas yy1o15 WU L9/A156W LNl0ls u:m 09/10/15 2015-16 Flow Monitoring 70 meters, 5 rain gauges Capture storm with saturated soils Potentially capture larger storm event Refine 1/1 high response areas .7� Increase coverage with more meters 'Art Improve model confidence & accuracy -A� "OV Example Meter Coverage for 2014-15 Flow Monitoring Program Legend Orinda Average: ,,48 I -miles/meter e 14j15.MeterPrcq,am 2014-15 PHWWF Pei ,k!ng Factor 8-9 0 major pump Station's —Force mains Sewers Tributary to Flcw Meter L%W 0" PS 09/10/15 3 Example Meter Coverage for 2015 -16 Flow Monitoring Program Legend Orinda Average: 18 miles /meter proposed New Meter �,. 14115 Meter program U Major pump stations -Force mains Sewers Tnbutary to Flow Meter MA \ N� Lae 7nrn 75 Flow Monitoring Agreement ploy -iio-nitoring 2015 -16 + $105 000 (4 weeks contingency, - - - $400,000 09/10/15 4 Flow Monitoring Approach is consistent with other similar efforts Miles per Mete Flow Monitoring supports District investment in the Dynamic Model • Current SNAP model was developed in mid 1980s • Static modeling is outdated by 10 -15 years — Does not model diurnal flows, attenuation — Does not simulate fate of SSOs, pump station or force mains — 1/1 based on pipe age, not rainfall • Proprietary / No Vendor Support / Outdated Software Language • Does not interface well with other software (e.g. ESRI GIS) • Wet weather calibration 30 years ago i 09/10/15 5 2014/2015: 41.7 miles /meter ------------------------------------ MO "'o ------------------------------ rnu .Sh IQO 2015/2016: 21.4 miles /meter - - - - -- — ( J` �• VZ�• 4, u• 7> ��• l) �• l)` ��<,`��•y��y,tf`� °VC�a�aV`y�`U�, U'o\t; ��<„1 �41`"Vp� ?•Utr•p:�� c 0 -411-le eI cP� � Flow Monitoring supports District investment in the Dynamic Model • Current SNAP model was developed in mid 1980s • Static modeling is outdated by 10 -15 years — Does not model diurnal flows, attenuation — Does not simulate fate of SSOs, pump station or force mains — 1/1 based on pipe age, not rainfall • Proprietary / No Vendor Support / Outdated Software Language • Does not interface well with other software (e.g. ESRI GIS) • Wet weather calibration 30 years ago i 09/10/15 5 Current CIP Includes Capacity Related Projects to be Confirmed by MP • District staff successfully implemented projects to address capacity issues in the 1980s/1990s • Evaluating design criteria and confirming capacity needs is critical (310 mgd PHWWF, 20 -year storm, no surcharging) • Current CIP lists at least -$36 +M in capacity- driven projects • MP to update capacity project needs and associated cost n. 3 - Expansion VC533 Trunk Sewer Expansion Pr $ Ig0,OW 8412 Pleasant Hill GrdKOn CreekrTrun4 5 .9,450,000 Manrnet Alhembre Avenue Trunks $ 2,'•00,000 pICSOR Larrcas[er Rd WC, Tr 13 -EQO 5 2,]00,000 Ln /ayelleNdppy Valley ROad Sevrcr 2,540,000 pC518 Trunk Sewer Er�pansion P.ogram -lT _ CS20 Mnre a We Cfrinda Tr 30- 200/3110 ; 2W 000 CS3R Pleasant Hill Read Corridor ;000000 A Line -Phase 20 1 700 000 pC5r10 Wnlnur Crrek - Palmer ROad $ 2950000 WCWaInuL Blvd Corr -Trunk 29200 5 1,BOO,Clp0 5 q70 000 N.W. Rd Oan Tr 35 -40(1 Plrase 1 lela a [e Lower Pleasant Nill Road Trunk 270 000 600000 ror a Danville- [>iablo Road Corridor Nelson Ave Sewer Re �I � 6W 000 S 1.200,000 uCSI: San kampn Sched C Int a for Ph 2 Flow Monitoring for Calibrating the Dynamic Model is Critical • Day -to -Day Customer Support & Coordination between Divisions • Evaluate Development Impacts • Evaluate Satellite Recycled Water Facilities • Evaluate Emergency Flow Routing Options • Evaluate Level of Service (LOS) goals with collection system design criteria (e.g. surcharging, design storm) • Identify and confirm expansion (capacity) projects • Update CIP cost estimates: Confirm system improvements required & reduce costs for capital expansion projects 09/10/15 A Calibrated Model helps District confidently address major issues • Avoid unnecessary requirements for new developments • Potential to lower investment costs for new development • Avoid costly /disruptive capacity projects if they are not required • Better anticipate capacity limitations that may be required and project triggers /timing I Long -Term Flow Monitoring Strategy • Collection System Master Plan will recommend long- term strategy for flow monitoring • Best to use calibrated model to select locations of permanent metering structures • Consider District purchase /program versus contracted service for future flow metering Most agencies contract flow monitoring services due to expertise and internal resources required Some exceptions (Sacramento, San Diego) 09/10/15 7 Recommendations • Perform 2015 -16 Flow Monitoring with 70 Meters for 9 weeks • Include additional 4 week contingency • Use calibrated model 1) for ongoing evaluations of development impacts and 2) to confirm & identify capacity projects • Allocate $400,000 from the contingency funds in the CS program to fund this project $295,000 (9 weeks) + $105,000 (4 weeks contingency) • Board Authorization for the General Manager to Execute Flow Monitoring Amendment for $400,000 with V &A Consulting Engineering • There is no impact on the implementation of other projects shown in the FY15 -16 CIB for the Collection System program Questions 09/10/15