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City of BudaWastewater Master Plan
Final Report Presentation
Graham Moore, PE
October 16, 2012
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Summary
Purpose:
Provide a plan for the City as to the required improvements and
additions necessary to convey and treat wastewater through 2040.
Agenda:
• Background
• Council Direction on WWTP Location
• Growth Projections
• Sewer CAD Model Development and Analysis
• Recommendations
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Background
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Buda WWTP Sunfield WWTPExisting Capacity 1.5 MGD 0.25 MGDTreatment Process Complete‐mix Extended‐aerationExisting Permit
(CBOD – TSS – N – P) 7 – 12 – 2 – 1.2 5 – 5 – 2 – 1
Future Capacity (Permitted)
1.5 MGD 0.99 MGD
Future Permit(CBOD – TSS – N – P) 5 – 12 – 2 – 0.8 5 – 5 – 2 – 1
Ultimate Capacity(Possible On Site)
4.0 MGD 5‐7 MGD
Ultimate Treatment Process Complete‐mix Complete‐mixPotential Re‐use Type I Type I
Ultimate Needs for Sunfield ‐ 3.0 MGD
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Wastewater Treatment Plant - Options
Options Considered:
• Option 1 – Approx. 1.0 MGD of Buda wastewater treated at Sunfield
WWTP & 3.0 MGD treated at Buda WWTP
• Option 2 – Buda WWTP converted to a lift station (LS) and all Buda
wastewater treated at Sunfield WWTP
• Option 3 – All Buda wastewater treated at Buda WWTP
• Option 4 – Buda WWTP limited to 1.5 MGD & Sunfield WWTP
expanded 2.5 MGD
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Wastewater Treatment Plant - Options
Options Considered:
• Option 1 – Approx. 1.0 MGD of Buda wastewater treated at Sunfield
WWTP & 3.0 MGD treated at Buda WWTP
• Option 2 – Buda WWTP converted to a lift station (LS) and all Buda
wastewater treated at Sunfield WWTP
• Option 3 – All Buda wastewater treated at Buda WWTP
• Option 4 – Buda WWTP limited to 1.5 MGD & Sunfield WWTP
expanded 2.5 MGD
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Option Selected by Council on January 3, 2012
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Option 4 Development
Scenario Highlights
• Requires agreement with GBRA to expand the Sunfield WWTP
• Sunfield WWTP becomes a regional plant
• Existing “Downtown” WWTP stays at current 1.5 MGD capacity
• Requires new regional lift station to replace the Night Hawk lift
station to convey flow from west to east
• Convert flows from South Buda WCID #1 to discharge directly to
Sunfield WWTP
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Growth Projections
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
11,024
15,061
19,912
25,452
31,690
38,574
45,987
2.80
3.013.17
3.293.38 3.45 3.50
0.0
1.0
2.0
3.0
4.0
0
10,000
20,000
30,000
40,000
50,000
2010 2020 2030 2040
Avg. Hou
seho
ld Size
Popu
latio
n
Year
Population Growth
Avg. Household Size
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Sewershed Map – Growth Projections
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Sewershed Map – Growth Projections
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Sewer CAD Model Development and Analysis
Model Setup:
• Entered actual flowline data from as-built drawings for the City
• Average daily flows were entered into the model based on lot counts
or water meter size
• Setup controls for lift stations to simulate actual operations
• Model estimated average flows of 1.017 MGD for the existing
condition; recorded inflow was 1.005 MGD (1.2 % error)
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Sewer CAD Model Development and Analysis
Residential Diurnal Curve:
• Peaks in morning (~7:30AM)
and in Evening (~9:30PM)
• Peak is 1.5 times average flow
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Non-Residential Diurnal Curve:
• Peaks between 8 AM and 6 PM
• Peak is 2.0 times average flow
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Sewer CAD Model Development and Analysis
Analysis:
• Future growth demands were loaded into the model based on the
future projections discussed previously
• Model was run to simulate ultimate conditions (2040) to identify
system deficiencies and ultimate capacities
• Model was then run to simulate years 2030, 2020 and 2015 to identify
timing and phasing of proposed improvements
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Map of Improvements
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PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Recommendations
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Priority Rank Proposed BudgetYear(s)
Project Title
1 2011‐2013 DowntownWastewater Rehab2 2012‐2013 Sportsplex Sewer Line Upsize3
2012‐2013Bradfield‐Lifschutz‐Stonefield
Interceptor (BLSI) Flow Monitoring Study
4 2013‐2014 Garlic Creek Lift Station5 2013‐2014 Lifschutz Bottleneck Replacement6 2013‐2015 S. Loop 4 LS Decommissioning &
Gravity Extension7 2013‐2015 Stonefield LS and Force Main to
Sunfield8 2014‐2015 Sunfield WWTP 0.5 MGD Capacity9 2016‐2017 Oxbow Interceptor
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Recommendations
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Priority Rank Proposed BudgetYear(s)
Project Title
10‐A 2016‐2020 WCID #1 LS Relocation & Hillside Terrace Interceptor
10‐B 2016‐2020 Main Street FM Phase 110‐C 2016‐2020 Sunfield WWTP 1.0 MGD Capacity
(Cumulative)10‐D 2016‐2020 Overlook LS & FM Improvements10‐E 2016‐2020 Old Nighthawk LS Decommissioning15‐A 2021‐2030 Main Street FM Phase 215‐B 2021‐2030 Night Hawk LS Upgrade15‐C 2021‐2030 Sunfield WWTP 1.5 MGD Capacity
(Cumulative)15‐D 2021‐2030 Meadows at Buda Interceptor
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Recommendations
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Priority Rank Proposed BudgetYear(s)
Project Title
15‐E 2021‐2030 West FM 967 Upsize15‐F 2021‐2030 West FM 967 LS & FM21‐A 2031‐2040 Buda Elementary LS Upgrade21‐B 2031‐2040 FM 2001 Wastewater
Improvements21‐C 2031‐2040 Sunfield WWTP 2.5 MGD Capacity
(Cumulative)21‐D 2031‐2040 Onion Creek Interceptor21‐E 2031‐2040 SE Buda LS & FM #2
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
Recommendations
Non-Project Related Recommendations:
• Flows at Downtown WWTP will likely pass the 75% threshold by next
Summer – triggers design for next treatment phase
• Continue to monitor growth to determine when projects need to occur
• Update SewerCAD model with new sewer lines/development every
other year (or as needed)
• Use the Master Plan with developers for discussions related to sewer
service to new areas
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
PLANNING | ENGINEERING | PROGRAM MANAGEMENT
GBRA Partnering
Memorandum of Understanding (MOU):
• Staff has discussed an MOU with GBRA for preliminary engineering
on the Sunfield Plant.
• MOU will be brought to Council on 10/30.
• City’s participation in preliminary engineering will be capped at
$40,000.
• MOU states that future agreements are anticipated that will discuss
plant ownership, phasing, operations, etc.
• MOU will expire in approximately 6 months unless extended by
Parties; City has right to terminate if it gives 30 days notice.
PLANNING | ENGINEERING | PROGRAM MANAGEMENT