jason sanson, city of columbus hazem gheith, arcadis · mitigating rdii at private sources,...
TRANSCRIPT
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Mitigating RDII at Private Sources, Challenges and Opportunities Jason Sanson, City of Columbus Hazem Gheith, Arcadis
5-Cities, Columbus Ohio – 2017
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Topics • Blueprint Columbus • Level of Service and RDII Reduction • Pilot RDII Mitigation Tests • Challenges and Opportunities
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Wet Weather Requirements
• Two consent orders with the State of Ohio – Separate Sanitary Overflow – Combined Sewer Overflow
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Background/Timeline
August 2002
Sept 2004
July 2010
Sept 2010
July 2012
Jan 2013
Sept 2015
July 2005
Dec 2015
Sept 2016
Wet Weather Management Plan
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Background/Timeline
August 2002
Sept 2004
July 2010
Sept 2010
July 2012
Jan 2013
Sept 2015
July 2005
Dec 2015
Sept 2016
WWTP Expansion Complete
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Background/Timeline
August 2002
Sept 2004
July 2010
Sept 2010
July 2012
Jan 2013
Sept 2015
July 2005
Dec 2015
Sept 2016
OARS Construction
Begins
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Background/Timeline
August 2002
Sept 2004
July 2010
Sept 2010
July 2012
Jan 2013
Sept 2015
July 2005
Dec 2015
Sept 2016
Request to Explore
Integrated Planning
OEPA Approved Request
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Background/Timeline
Ohio EPA Approved Plan; City Council Legislation Enacted
August 2002
Sept 2004
July 2010
Sept 2010
July 2012
Jan 2013
Sept 2015
July 2005
Dec 2015
Sept 2016
Blueprint Columbus
Report Submitted
Implement Blueprint
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The Four Pillars
Gree
n In
fras
truc
ture
Late
ral L
inin
g
Volu
ntar
y Su
mp
Pum
p
Roof
Red
irect
ion
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Topics • Blueprint Columbus • Level of Service and RDII Reduction • Pilot RDII Mitigation Tests • Challenges and Opportunities
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Level of Service – Typical Year
• Typical year used for CSO
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Level of Service – Historical Recurrence
• 20-year scenario used to determine SSO, WIB and bypass compliance
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Level of Service - Stormwater
• Quantity Control – Do-no-harm for localized
flooding – No increase in peak flow to
Streams
• Quality Control – 20% Total Suspended Solids
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Roof redirection and Sump Pumps
• Target peak RDII flow reduction is 60-65% to achieve LOS
• Blueprint assumption – 50% Roof redirection
Participation (with 50% effectiveness due to potential poor gutters condition)
– 25% Sump pumps Participation (90% effectiveness)
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Topics • Blueprint Columbus • Level of Service and RDII Reduction • Pilot RDII Mitigation Tests • Challenges and Opportunities
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Pilot RDII Mitigation Tests • Five Houses
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Lateral Flow Monitoring RDII Mitigation Technologies Tested • Lateral Lining (LL) • Roof Redirection (RR) • Traditional Sump Pump (TSP) • Deep Sump Pump (DSP)
Controlled storms applied • 3-month in the morning • 1-year in the evening
Water Application • 6’ buffer around the house • 6’ buffer above lateral pipe
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• Existing Condition • Lateral Lining • Add Roof Redirection
Technology Peak Flow Reduction
Volume Reduction
LL 30-33% Not significant
Add RR (less water applied)
33% 45%
House 1: 764 E Whittier St – LL, RR, TSP, DSP
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Traditional Sump Pump Traditional Sump Pump
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• Existing Condition • Lateral Lining • LL + Traditional Sump Pump
Technology Peak Flow Reduction
Volume Reduction
LL 30-33% Not significant
Add TSP Not significant
Not significant
House 1: 764 E Whittier St
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Deep Sump Pump Design
• Draw groundwater table down around the 4” x 6” connection
772.09
773.05
1.56 ft
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• Existing Condition • LL + TSP • LL + Deep SP
Technology Peak Flow Reduction
Volume Reduction
LL 30-33% Not significant
Add TSP Not significant
Not significant
Use Deep SP 12-13% 9%
House 1: 764 E Whittier St
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House 2: 227 N Oakley Ave
• Existing Condition • LL • LL + Traditional Sump Pump
Technology Peak Flow Reduction
Volume Reduction
LL 40% small storms More RDII in large storms
Not significant
Add TSP 0% in small storm 15% in large storm (basement flow into sump)
Not significant
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House 2: 227 N Oakley Ave
• Existing Condition • LL + TSP • LL + Deep SP
Technology Peak Flow Reduction
Volume Reduction
LL 40% small storms More RDII in large storms
Not significant
Add TSP 0% in small storm 15% in large storm
Not significant
LL + Deep SP
13% in small storms 0% in large storms
15%
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House 3: 985 Carpenter St – TSP, DSP (no LL)
• Existing Condition • TSP • Deep SP
Technology Peak Flow Reduction
Volume Reduction
TSP Not Significant 20%
Deep SP 30 - 37% 41%
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Additional monitor was placed at upstream end of the lateral pipe Technologies Tested: • Traditional Sump Pump • Traditional Sump Pump with a Pipe below foundation to collect
flow around the 4” x 6” connection
445 Terrace Avenue Site Plan
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House 4: 445 Terrace Ave – TSP, Modified SP Configuration
Peak flow into lateral • 29% of the peak in small storms • 14% of the peak in large storms
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Modified Sump Pump Configuration
• Extend perforated pipe under foundation to collect flow around the 4” x 6” connection
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House 4: 445 Terrace Ave
• Existing Condition • TSP • Modified TSP Config
Technology Peak Flow Reduction
Volume Reduction
TSP 20-25% 10%
Modified TSP 20-25% 23%
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Technologies tested • Traditional Sump Pump • TSP with extended pipes above
and below foundation • Tight the 4” x 6” connection • Deep SP with extended pipe
House 5: 402 S Richardson Ave – TSP, Modified SP Configuration
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• Extended pipe above foundation
House 5: 402 S Richardson Ave Modified SP Configuration
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House 5: 402 S Richardson Ave
• Existing Condition • TSP • Modified TSP Config
Technology Peak Flow Reduction
Volume Reduction
TSP 32- 38% 65%
Modified TSP Pipe Above
Not Significant
Not Significant
Modified TSP Pipe Below
Not Significant
Not Significant
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36” Sump Pump with External Pipe
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House 5: 402 S Richardson Ave
• Existing Condition • Tight 4”x 6”
Technology Peak Flow Reduction
Volume Reduction
Tight 4” x 6” 16-21% 46%
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House 5: 402 S Richardson Ave
• Tight 4” x 6” • Add Deep SP (36”) • Add Close Floor Drain
Technology Peak Flow Reduction
Volume Reduction
Tight 4” x 6” 16-21% 46%
Add Deep SP (36”) Not Significant
Not Significant
Add Close Floor Drain 53-65% 50-60%
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Topics • Blueprint Columbus • Level of Service and RDII Reduction • Pilot RDII Mitigation Tests • Challenges and Opportunities
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Challenges and Opportunities • Challenges
– A combination of RDII reduction technologies are required to achieve the target LOS
– Lateral lining could cause groundwater to build up around house perimeter – Traditional sump pumps is least effectiveness in RDII reduction
• Opportunities – Highest level of RDII reduction is expected in houses with foundation drains
that could be connected directly into storm sump pump – Roof drainage redirection is highly effective (assuming gutters are in good
shape to avoid splashing around the house) – Deep (no-traditional) sump pump increase the effectiveness of the sump pump
reduction technologies with additional cost
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Thank You Jason Sanson, [email protected] Hazem Gheith, [email protected]