Public Information MeetingPublic Information MeetingParkway Drive/17Parkway Drive/17thth Avenue Avenue

RehabilitationRehabilitation

Rawson Avenue to Hemlock CourtRawson Avenue to Hemlock Court

Project Area:

Parkway Dr / 17th Ave (from Rawson to Hemlock)

Parkway Drive/17Parkway Drive/17thth Avenue Avenue RehabilitationRehabilitation

(Rawson to Hemlock) (Rawson to Hemlock)

I.I. Purpose of Meeting:Purpose of Meeting:

- Summarize storm events & - Summarize storm events & existing existing systems systems

- Summarize proposed work- Summarize proposed work

- Answer questions and address - Answer questions and address comments comments

II.II. Significant Storm Events (Recent History):Significant Storm Events (Recent History):

- June 1997 (2% annual chance flood)- June 1997 (2% annual chance flood)

- August 1998 ( 10- August 1998 ( 10thth highest single day rainfall – highest single day rainfall – MKE)MKE)

- July 2000 (rated at 1% probability)- July 2000 (rated at 1% probability)

- June 2008 (Est. 0.2 to 1% probability)- June 2008 (Est. 0.2 to 1% probability)

- July 2010 ( Est. 0.2% probability)- July 2010 ( Est. 0.2% probability)

- Oak Creek gaging station – 47 year record- June - Oak Creek gaging station – 47 year record- June 20082008

- June 2008 flow was only exceeded once – July - June 2008 flow was only exceeded once – July 20102010

- South Milwaukee not isolated case – Widespread - South Milwaukee not isolated case – Widespread flooding in 2008 and 2010 flooding in 2008 and 2010

III.III. System AssessmentsSystem Assessments

- Oak Creek Watercourse/Floodplain functioned - Oak Creek Watercourse/Floodplain functioned to to protect loss of life, loss of structures, protect loss of life, loss of structures, limited the limited the amount of property damage amount of property damage (public & private)(public & private)

- Storm water collection system- Storm water collection system

- Pipe & inlet design capacity - Pipe & inlet design capacity exceededexceeded

- Inlet clogging (debris), major & - Inlet clogging (debris), major & minor minor collection systems full collection systems full

- Private systems exceeded (sump - Private systems exceeded (sump crocks, crocks, yard drainage) yard drainage)

III.III. ContinuedContinued

- Sanitary Sewer System- Sanitary Sewer System- Subject to infiltration & inflow (I/I) of clear - Subject to infiltration & inflow (I/I) of clear

waterwater- Results in surcharging of system which leads - Results in surcharging of system which leads

to to basement back-ups basement back-ups

- Separate Storm & Sanitary Systems – I/I sources- Separate Storm & Sanitary Systems – I/I sources - Public system – not a sealed system- Public system – not a sealed system

- Pipe joints or cracks- Pipe joints or cracks- Manholes- Manholes- Old connections- Old connections

- Private systems- Private systems- Illegal drain connections (Roof, Driveway)- Illegal drain connections (Roof, Driveway)- Foundation drains – homes without sump - Foundation drains – homes without sump

pumps pumps (1920 – 1954)(1920 – 1954)- Private laterals ( house to main)- Private laterals ( house to main)- Sump pumps into floor drains or wash tubs- Sump pumps into floor drains or wash tubs- Sump pump excess / high ground water- Sump pump excess / high ground water

IV.IV. Methods & Options to reduce I&IMethods & Options to reduce I&I

- Public system- Public system- Manhole seals / sealed lids- Manhole seals / sealed lids- Manhole replacement / lining- Manhole replacement / lining- Pipe lining / pipe replacement- Pipe lining / pipe replacement- Video inspection to identify repairs- Video inspection to identify repairs- Drainage improvements – keep - Drainage improvements – keep

ponded ponded water off street & private water off street & private propertyproperty

- Provide sump connections- Provide sump connections- Private system- Private system

- Replace old laterals- Replace old laterals- Eliminate illegal connections- Eliminate illegal connections- Eliminate foundation drains to - Eliminate foundation drains to

sanitarysanitary

V.V. Most Effective Solutions to reduce Most Effective Solutions to reduce chance of sanitary backups & flooding- chance of sanitary backups & flooding- Parkway Heights Area:Parkway Heights Area:

- - Sanitary SystemSanitary System - Has capacity for standard - Has capacity for standard design design flows flows

- Reduce MH hydraulic losses (90- Reduce MH hydraulic losses (90º º bends)bends)

- Replace or reconstruct manholes - Replace or reconstruct manholes - Sanitary sewer - Sanitary sewer

replacement/repair where replacement/repair where inflow inflow (cracks)(cracks)

- Improve efficiency of relief (By - Improve efficiency of relief (By pass) stationpass) station

- Reduce flow from south - Reduce flow from south (possible improvements by (possible improvements by

Missouri Lift Missouri Lift Station) Station)

V.V. ContinuedContinued

- - Storm Sewer-Storm Sewer- undersized based on existing undersized based on existing development, runoff development, runoff

- Construct relief storm sewer & - Construct relief storm sewer & inletsinlets

- Construct secondary overland flow - Construct secondary overland flow path to path to creek creek

- Replace old inlets (improving - Replace old inlets (improving upstream upstream collection) collection)

- Provide sump connections if - Provide sump connections if feasiblefeasible

- Provide upstream storm sewer - Provide upstream storm sewer work where work where basement flooding basement flooding causing sanitary inflowcausing sanitary inflow

- Street capacity – reduce crown for - Street capacity – reduce crown for increased increased capacity capacity

VI.VI. Contemplated WorkContemplated Work

- - Sanitary SewerSanitary Sewer::

- Sanitary manhole repair or replacement - Sanitary manhole repair or replacement

- Possible replacement of sanitary main at - Possible replacement of sanitary main at Spruce Spruce

(minor cracks)(minor cracks)

- Other minor work at Hemlock & Spruce to - Other minor work at Hemlock & Spruce to improve improve hydraulics hydraulics

- Install 12” sanitary pipe for future relief station - Install 12” sanitary pipe for future relief station upgrade (3 – 4 months design following upgrade (3 – 4 months design following

approval, approval, $200 – $250,000 funding required) $200 – $250,000 funding required)

- Possible modifications near Missouri Lift Station- Possible modifications near Missouri Lift Station

VI.VI. Contemplated Work ContinuedContemplated Work Continued

Storm SewerStorm Sewer::- Install relief line between 521 & 531 - Install relief line between 521 & 531

Parkway Drive Parkway Drive - Install overland bypass and - Install overland bypass and storm sewer work on storm sewer work on 17 17thth Avenue south of Oak Avenue south of Oak

- Other storm work (inlets)- Other storm work (inlets)

WatermainWatermain::- Hemlock main replacement ( Parkway to - Hemlock main replacement ( Parkway to

Poplar)Poplar)- Other valve replacement- Other valve replacement

Street RehabilitationStreet Rehabilitation::- Spot replacement of curb & gutter- Spot replacement of curb & gutter- Grade to remove high crown in critical - Grade to remove high crown in critical

areasareas- Remove and replace asphalt paving- Remove and replace asphalt paving

VII.VII. Preliminary Schedule:Preliminary Schedule:

- August contract awarded- August contract awarded

- Sanitary, Storm and Watermain - Sanitary, Storm and Watermain construction – September/ construction – September/

October 2011October 2011

- Curb work / base Asphalt – October/- Curb work / base Asphalt – October/ November 2011 November 2011

- Surface Asphalt – Spring 2012- Surface Asphalt – Spring 2012

- Relief (bypass) Station upgrade – TBD - Relief (bypass) Station upgrade – TBD based on based on funding funding

VIII.VIII. SummarySummary

- City Goal:- City Goal:- Reduce risk of floods and sanitary - Reduce risk of floods and sanitary

back-ups back-ups by design & construction of by design & construction of cost effective / cost effective / practical solutions practical solutions

- Property Owners:- Property Owners:- Do what you can to protect - Do what you can to protect

property and property and others others- Downspouts, grading, drainage, - Downspouts, grading, drainage,

backflow backflow valve, sump pump capacity valve, sump pump capacity- Discharge of sumps- Discharge of sumps