blueprint columbus southeast district awwa conference · – original schedule (30 more years),...
TRANSCRIPT
Blueprint Columbus Southeast District AWWA Conference November 4, 2016
Agenda • Consent Order
background
• Blueprint Plan
• Gray Plan
• Costs
• Benefits of Blueprint
Columbus’ Wet Weather Timeline
August 2002
September 2004
July 2010
September 2010
July 2012
January 2013
September 2015
July 2005
Columbus’ Wet Weather Timeline
August 2002
September 2004
July 2010
September 2010
July 2012
January 2013
September 2015
July 2005
SSO Consent
Order
CSO Consent
Order
Wet Weather Management
Plan
Columbus’ Wet Weather Timeline
August 2002
September 2004
July 2010
September 2010
July 2012
January 2013
September 2015
July 2005
WWTP Expansion Complete
OARS Construction
Begins
25
35
45
55
65
75
85
95
105
115
1250
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
2007 2008 2009 2010 2011 2012 2013 2014
Rain
fall
(in)
Tota
l Ove
rflo
w (M
G) Total Overflow
WWTP Bypass and Overflow from the Largest SSO and CSO
Total Overflow (MG) Rainfall (in)
2011 is the wettest year on record.
Columbus’ Wet Weather Timeline
August 2002
September 2004
July 2010
September 2010
July 2012
January 2013
September 2015
July 2005
Request to Explore
Integrated Planning
OEPA Approval of
Request
Blueprint Columbus
Report Delivered
Delivered to Ohio EPA on Sept. 15, 2015 • The Integrated Plan and 2015 WWMP
Update – Both plans have to meet functional requirements
• Four schedules for completing plan – Original schedule (30 more years), plus 5, 10 and
15 years shorter
– Blueprint to be completed by 2035
• Affordability analysis – demonstrating plan is fast but affordable
What is the Blueprint Approach?
• Blueprint has four pillars
– Mandatory lateral lining
– Selected roof redirection
– Voluntary sump pump
– Green infrastructure
• Vacant lot repurposing
Gree
n In
fras
truc
ture
Late
ral L
inin
g
Volu
ntar
y Su
mp
Pum
p
Roof
Red
irect
ion
Pre-Blueprint Condition • Directly connected roof drains and ineffective
splash blocks contribute rain to the foundation drain
• The foundation drain is connected to the lateral • Lateral may be cracked or leaking
Roof Drain Redirection and Lining • Roof drain redirection will direct water
away from the foundation drain • Laterals and mainlines lined
Voluntary Sump Pump Program and GI Sump pumps and lateral lining will disconnect foundation drains from the lateral and direct the water to green infrastructure
Blueprint Clintonville – Green Infrastructure
• Do No Harm
– Street flooding will not get worse
– Green infrastructure will be sized to receive redirected flow
• 20% reduction in Total Suspended Solids
• Do not expect any infiltration into the soil
– Infiltration testing shows average infiltration at 0.006 inches per hour
– Provide treatment and some detention prior to release to storm system
Blueprint Map
18,400 acres
Gray Improvements Needed in Both Plans
• It was determined that the Blueprint Plan would need to have some gray infrastructure included
– Tunnel on the west side known as Lower Olentangy Tunnel
• The tunnel needed in the Blueprint Plan for two reasons
– Completion of the CSO program
– Certain areas not solved with Blueprint alone
• The gray plan will include this tunnel, plus more tunnels
The Blueprint Plan
• Applied modeling assumptions on all of the map areas
• Checked to make sure SSOs and WIBs are eliminated
– (this is when the need for LOT was identified)
• Checked to make sure not making things worse outside Columbus
• Determined that Blueprint could be successful without any participation from suburban areas
• Some areas solved with just Blueprint, some required additional solutions
• Includes green infrastructure (not depicted on maps yet)
X X X X
1 WIB
Columbus area reduced from 928 acres to 432 acres
X = DSR or Connection Closed
0 = Weir Raised/Reconfigured
= New Pipes Installed
X
No work in Upper Arlington or Franklin County
To LOT/FM
WIBs DSRs
Base 103 10
BLU 1 0
Fifth by Northwest
2. LOT1 provides free boundary condition
1. Oxley Rd Relief is closed
Fifth by Northwest
WIBs DSRs
Base 103 10
GRY 0 0
X = DSR or Connection Closed
0 = Weir Raised/Reconfigured
= New Pipes Installed = Pipes Upsized
Blueprint Plan
Gray Plan
Functional Requirements
• All plans meet the following functional requirements:
– 10 year level of service for SSOs
– 10 year level of service for WIBs
– 10 year level of service for downtown CSOs
– Typical year level of service for other CSOs
– 4 overflows in a typical year for the OARS CSO
– 1.4 year level of service at Southerly WWTP bypass
Costs • The cost of the Blueprint plan and the Gray plan are similar
– Blueprint $1.77B
– Gray $1.61B (2015 WWMP)
• Both are lower than the remaining cost of the 2005 WWMP, which is $2.47B
• Rates are based on the Total Capital
• The new plan is cheaper!
Blueprint Gray 2005 WWMP
Consent Order $1.77 B $1.61 B $2.47 B
Non-Consent Order $1.88 B $2.02 B $2.02 B
Total Capital $3.64 B $3.63 B $4.49 B
0
500
1,000
1,500
2,000
2,500
3,000
2005 2010 2015 2020 2025 2030 2035 2040 2045 2050
Aver
age
Annu
al O
verf
low
(M
G)
Blueprint Projects
BWARI, Headworks, WWTP Peak Capacity Expansion
CEPT, OARS Completion
SMR, DSR 83, Sluice Gates
How Does Blueprint Impact Overflows?
Technology Volume Reduced (MG)
Peak Reduced (MGD)
Sewer Lining 17.5 0.3 Lateral Lining 26.2 0.6 Sump Pump 12.1 2.0 Downspout Redirection 6.4 1.3 All 4 Technologies Combined
67.0 3.3
Note that each row is a separate model run. Approximately this amount will be routed to the stormwater system.
I/I Reduced by Technology: Typical Year of Rain Clintonville Pilot Area
Benefits of Blueprint Plan
• Water Quality - Stormwater
– Removes 342 tons of sediment from local rivers and streams annually once all 18,000 acres are constructed
– That’s 44 Hanks!
– $373 M in Green Infrastructure
• Regional Economic Impact
– Keeping money local compared to out-of-town tunneling companies
– Products and services provided by the community
Columbus Zoo’s Hank weighs 15,600 pounds
Benefits of Blueprint Plan
• Job Creation
– GI maintenance jobs
– Smaller construction projects
• Neighborhood Impacts
– Green amenities
– Renewed laterals
• Addressing the problem rather than the symptom
Benefits of Blueprint Plan
• Blueprint includes $959 M in renewed infrastructure – Approximately half of this will go towards lining laterals
– Solving the source of the problem that will only get worse if left alone
• The gray plan only includes $390 M in renewed infrastructure – Gray depends on building new assets rather than fixing the existing
assets
– Does not include the liability that homeowners face with lateral failures
– Rates will be the same but homeowners will incur more costs
Where can you find the report?
http://www.columbus.gov/blueprint/
