Post on 13-Jul-2020
Massachusetts Water Resources Authority
Presentation to the
MWRA Wastewater Advisory Committee
Hurricane Preparations Before and After Sandy
January 4, 2013
Michael J. Hornbrook Chief Operating Officer
The Forecast
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• MWRA staff par-cipated in conference calls hosted by the Na-onal Weather Service
National Weather Service Briefings
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• In an-cipa-on of the storm, reservoir levels were lowered in order to ensure capacity
– Quabbin stopped transfer to WachuseC
– WachuseC released 700 mg – Sudbury System released 470 mg
– Chestnut Hill Reservoir released 13.7 mg
Lowered Reservoir Levels
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Reservoirs During March 2010 Rains
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Storm Preparations
• Staff began mee-ng and making prepara-ons early in the week
– Generators tested
– Cri-cal equipment checked
– Chemical levels topped off
– Fuel topped off
– 24-‐hour staffing plans developed for EOC, opera-ons, maintenance and other essen-al staff
• MWRA sent out weather advisories to its member communi-es throughout the storm beginning on Thursday
Community Notifications
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• Updates were also provided on MWRA’s web page
Web Updates
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Web Updates
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Pre-Positioned Pumps In Critical Locations
• Portable pumps were pre-‐posi-oned – 2 at Melrose
– 2 at IPS in Weymouth for the South Shore
– 1 at Somerville Marginal
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Pumping During March 2010 Storms
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• Sandbags were filled and stacked at the Clinton Treatment Plant and the Alewife Pump Sta-on
Sandbagging
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Flooding At The Clinton Treatment Plant March 2010
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• Opera-onal procedures for large storms reviewed • Par-es no-fied
• Tunnel emp-ed
South Boston CSO Tunnel
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Construction Projects Were Shut Down
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Coordinating With MEMA
• MWRA had a representa-ve at the MEMA bunker in Framingham throughout the storm
EOC Activation
• MWRA’s emergency opera-ons center (EOC) in Chelsea was ac-vated at 7:00am Monday, October 29th un-l the storm had passed
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Deer Island EOC Was Also Opened
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Monitoring Pumping
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Monitoring Deer Island Flows
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Monitoring Rainfall By Location
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• EOC sent updates throughout the storm to a pre-‐determined distribu-on list for “Major Wet Weather Event”
Hourly Updates Sent To Staff
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Wastewater System Performance
• Total rainfall measured at Chelsea was 2.23 inches
• 2 of 3 headworks reached capacity
• All CSO facili-es ac-vated
• No SSOs
Dura-on
Peak Flows MG
Chelsea Creek: No 319 Ward Street: Yes 2 hr. 5 min. 253 Columbus Park: Yes 5 hr. 3 min. 180
Volume
Discharged Dura-on of Ac-va-ons
MG CoCage Farm Yes 8.68 2 hr. 24 min. Prison Point: Yes 32.70 11 hr 32 min. Somerville: Yes 5.37 7hr. 34 min. Union Park: Yes 3.55 1 hr. 51 min.
Hourly Flows At Wastewater Facilities
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0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
0.00
100.00
200.00
300.00
400.00
500.00
600.00
700.00
800.00
900.00
1000.00
02:00 PM 03:00 PM 04:00 PM 05:00 PM 06:00 PM 07:00 PM 08:00 PM 09:00 PM 10:00 PM 11:00 PM 12:00 AM 01:00 AM 2:00 AM
* 0.63 0.17 0.08 0.04 0.02 0.08 0.26 0.31 0.02 0.01 0.00 0.00 0.00
CSO FACILITY FLO
WS (M
GH)
Avg. hou
rly -‐W
W FLO
W (M
GD)
Time & Rainfall (inches)
Storm Event October 29-‐30, 2012
Prison Point CSO
Somerville Marginal CSO
Union Park Detention Facility
Cottage Farm CSO
Ward St HD WK
Columbus Park HD WK
Chelsea Creek HD WK
DEER ISLAND TOTAL Hourly Flow
– Ludlow Monitoring Sta-on – Oakdale Power Sta-on
– Carroll Treatment Plant
– Hultman Shai 4
– MetroWest Shai L
– MetroWest Shai E
– Norumbega Covered Storage
– Turkey Hill Tank
– Oak Hill Tank
– Spring Street Pump Sta-on
– Blue Hills Covered Storage
– Loring Road
– Deer Island Tank
– Chelsea Facility
– Chelsea Screenhouse – Chelsea Headworks
– Columbus Park Headworks
– Nut Island Headworks
– Braintree-‐Weymouth Pump Sta-on
– Caruso Pump Sta-on
– Houghs Neck Pump Sta-on
– New Neponset Pump Sta-on
Power Outages
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MWRA experienced power outages at numerous facilities across the service area:
• At Deer Island, a sec-on of a gravity thickener scum roof was ripped off by the wind
Storm Damage
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Before A(er
• Over 100 trees and numerous limbs came down along the aqueducts in the MetroWest area
Storm Damage
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Storm Damage
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Entrance to Southborough facility
• Biggest poten-al MWRA impact -‐ wastewater system
• Evalua-ng various storm surge scenarios
• Compare storm surges to building eleva-ons/interior equipment
• Re-‐Evalua-ng current designs:
– Chelsea Creek Headworks – Alewife Pump Sta-on
Post Sandy Evaluations
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Water Levels as Recorded by Tidal Gage #8518750, near Manhattan, NY
9’ higher than normal high tide.
11’ above MSL
Impact Evaluations
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PK scenario
100
Year
Sto
rm
500
Year
Sto
rm
100y
r + 2
.5' o
f SLR
11 ft
abo
ve M
SL
9ft a
bove
hig
h tid
e
100y
r Sto
rm
500y
r Sto
rm
Reference water elevation (*) 115.83 116.63 118.33 117.43 120.33 120.41 121.21
Cottage Farm CSO 112.96 114.00 1.83 2.63 4.33 3.43 6.33 • •Somerville Marginal CSO 115.66 116.00 0.63 2.33 1.43 4.33 • •Commercial Point CSO 121.26 122.50
Fox Point CSO 118.96 120.00 0.33 • •Constitution Beach CSO 117.16 117.50 0.83 2.83 • •Chelsea Creek Headworks 113.16 117.12 1.21 0.31 3.21 • •Chelsea Screen House 113.86 115.00 0.83 1.63 3.33 2.43 5.33 • •Delauri P.S. 118.66 120.00 0.33 • •Alewife Brook P.S. 112.66 114.50 1.33 2.13 3.83 2.93 5.83 • •Caruso P.S. 118.16 120.00 0.33 • •Houghs Neck P.S. 115.36 118.83 1.50 • •Braintree-Weymouth IPS 126.14 127.25
Squantum P.S. 114.66 118.00 0.33 2.33 • •Pelletizing Plant 116.36 119.00 1.33 • •Chelsea Facility 116.30 117.76 0.57 2.57 • •
2100 SLR High Emissions ScenarioCurrent
Gro
und
Elev
atio
n
(LID
AR
-Der
ived
)
Low
est B
uild
ing
Ope
ning
Su
rfac
e El
evat
ion
Sandy with a Boston Landfall
• Reservoir Storage/Releases
• Turbidity in Reservoirs
• Equipment in manholes
Drinking Water Infrastructure Impacts
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• Selec-on of “Storm Surge” -‐ dictates ability to mi-gate
• “Survivability”/Level of Service of cri-cal facili-es
• Priori-za-on of facili-es’ modifica-ons
• Funding availability
Future Key Decisions
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