View
43
Download
0
Category
Preview:
DESCRIPTION
Rhode Island Stormwater Design and Installation Standards Manual. Public Workshop Typical Maintenance Costs January 19, 2011 Several Slides Courtesy of Center for Watershed Protection. Major: Rehabilitation or reconstruction Non-routine: - PowerPoint PPT Presentation
Citation preview
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Public WorkshopTypical Maintenance Costs
January 19, 2011Several Slides Courtesy of Center for Watershed
Protection
Rhode Island Stormwater Design and Installation Standards Manual
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Major:Rehabilitation or reconstruction
Non-routine:Cleanout trash and sediment,
structural repairs, partial rehabilitation
Routine:Visual assessment, mowing,
litter & debris removal, vegetation management
Stormwater BMP O& M PyramidSource: Erickson, et. al, 2010
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Audience Poll
• Who has primary responsibility for maintenance in your community?– Haven’t figured it out yet– Private landowners or homeowners
associations– Local government or other public
agency– Hybrid of public and private sector
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Factors that impact maintenance costs
• Inspection frequency;• Required routine maintenance (# of
maintenance actions – function of type of practice);
• Required specialized equipment;• Number of staff hours required for
routine items;• Required non-routine
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Plan Review
The Life Cycle Approach to Stormwater Maintenance
• The most successful programs recognize that effective stormwater BMP maintenance involves more than just maintenance
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Maintenance Program Scoping Questions
• What are the local watershed protection and restoration objectives?
• How many stormwater BMPs are currently in place?
• How many more stormwater BMPs are expected?
• Where will they be located?• Who will maintain them?• What will be the level of service provided
by the community?• How can the program be funded?
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Program Level of Service
• Complaint-driven /political program
• Regular inspection and maintenance schedule
• Inspection reports and record keeping
• Public vs. private maintenance
• Program funding
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Maintenance Program Models
• Communities have several different options to consider when vesting maintenance responsibilities– Option 1: Private maintenance– Option 2: Public maintenance– Option 3: Hybrid
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Maintenance Program Options
• Option 1: Private MaintenanceCommunity responsible for public stormwater controls, homeowners or businesses have responsibility for private controls
• Reduces costs• Good option for small communities with
limited staff• Community still responsible for education,
tracking and enforcement
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Key Considerations for Option 1
• Who should conduct routine inspections?• How to ensure that maintenance continues
when properties change hands?• When should enforcement be used?
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Maintenance Program Options
• Option 2: Public MaintenanceCommunity has full responsibility for maintenance of both public and private stormwater controls
• Uncommon due to costs• Better control• Requires dedicated staff and funding• Avoids legal roadblocks and questions
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Budgeting for a Local Maintenance Program
• Staff• Equipment• Administration• Tracking/GIS• Contractual Services• Other
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Maintenance LOS
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Maintenance Manual Reference
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Maintenance ChecklistsAppendix E
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
AnnualO&M costs a function of
capital costBioretention:$O&M% = 90.1($CC)-0.29
Wet Basins:$O&M% = 230.9($CC)-
0.36
Open Channels:$O&M% = 2526($CC)-0.53
For Example:Bioretention costing
50KO&M cost ~ 4% of CC
Open Channel practice costing 50k
O&M cost ~ 8% of CC
CC = Cap CostSource: Kang, Weiss: Univ of MN
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Annual cost of sediment removal (2005)
Source: Erickson, et. al, 2010
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
More cost data (2005)
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
More cost information• Typical construction inspection costs for LID
systems: 2-4% of Capital Construction Cost (HW personal experience)
Source: Christina Basin Trib Team, DE, 2005
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
More cost data (2003)
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
More cost data (2003)
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
More data (2004+/-)(http://www.stormwatercenter.net
/)
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
More Data
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
ExampleAnnual predicted maintenance
costs• Raingarden: $650• Infiltration chambers: $300/ system• Site/landscaping: $2,000
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Reduce Maintenance “Liability” During BMP Selection & Design
• Include low-maintenance, non-structural BMPs
• Thorough plan review ensures design standards are properly implemented
• Review the plan as if you were the maintenance crews…or have maintenance staff actually review the plans
• Get standards off the books and onto site plans!
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
• Review site plans with maintenance in mind
• Require detailed maintenance plan – Inspection schedule– Maintenance frequency – Responsible party
• Require pretreatment• Strive to make sediment
removal operations quick and easy
• Design practices with gentle side slopes
• Include native vegetative “no mow” buffers around stormwater practices
• Require long-term vegetation management plan
Plan Review ChecklistPlan Review Checklist PretreatmentPretreatment Maintenance AccessMaintenance Access Landscaping PlanLandscaping Plan
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Conduct Inspections During AND After Construction
• Use inspections to check progress and quality of installation, not just for erosion and sediment control
• Annual maintenance inspections
• Use detailed inspection checklists
• 1 FTE: 250 to 500 BMPs/year
• Third party inspections?
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Routine and Thorough Inspections After Construction
• Annual inspections• Detailed inspection
checklists• Measurements where
available• Mark problem areas
(e.g. spray paint)• Issue work orders to
correct problems • Third party
inspections?
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Synchronize Field Data and Office Data
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Educate and Involve the Maintainers
• BMP “owner’s manuals” and other educational materials
• “Adopt-a-Pond” programs• Volunteer cleanup events
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Questions?
Recommended