City ofn Tigard Respect and Care Do the Right Thing Get it Done TIGARD STORMWATER MASTER PLAN Tualatin River Watershed Council January 4, 2017
Tigard Stormwater Master Plan Why It s Needed Long Overdue: Last Tigard Storm MP is from 1980! Environmental Regulations have changed dramatically City has grown New technologies, approaches are available and needed Infrastructure is aging, stream channels degrading Need to know much more about system condition City lacks policies for system management and setting priorities Opportunity to Develop Greenway Management Approach For Multiple Infrastructure Elements
Stakeholder Involvement INTERNAL STAFF INVOLVEMENT: Public Works (Operations and Engineering), Community Development (Planning), Finance, Risk Management STORMWATER PLANNING COMMITTEE: Public: Neighborhoods, Tualatin Riverkeepers Business/Development Community Adjacent Cities (Beaverton, Portland, Lake Oswego) Other Partner Agencies (Clean Water Services, ODOT) CITY COUNCIL & PUBLIC: Website, Tree For All Events, Public Group Meetings, Council Updates & Adoption Process
Broad Issues - Technical Stream Erosion Culverts lack of info & maintenance Underground Detention Pipes Localized Flooding Spots O&M Needs Design Standards Needs Critters New Regulations/Permits City of Tigard
Broad Issues Program/Non-Tech New Regulations/Permits Defining Private vs Public Problems (What s ours?) Level of Service to Provide to Various Systems What level of Risk are we/should we be tolerating? What are our Priorities? Rating/Ranking How much is all this going to cost and how should we pay for it? Raise rate surcharge? Defining & Effectively Using Partnerships Are we set up Organizationally to plan/permit/design/construct/maintain/ the system?
Work To Date Data Compilation from Internal Staff Sources (massive amount of work) Desktop Infiltration, Stream Erodibility & Risk Assessment Field Data Collection (culvert & bridge conditions, eroding channels, sites for potential facilities) Mapping Policy Discussions: What do/should we manage? What level of service to provide along streams? Draft Tool Kit
Some Field Investigation Results
Policy Discussions Context. City of Tigard
Scenario 1 118 th Ct. & Derry Dell
Scenario 2 Upper Kruger Creek Multiple Ownerships, Multiple Issues
Upper Krueger Creek City of Tigard
Scenario 4 Piped Stream on Private Property Stream in a 96 pipe under private property. Historic flooding issues.
Assessments Results City of Tigard
Stormwater Master Plan Desktop Geomorphic Assessment: PRIORITY Infrastructure Risk (1 = Low; 6 = High)
Soil Infiltration Potential
Draft List of Potential Solutions CONSTRUCTED Ponds, Slope Stabilization, Piping, Floating Wetlands, Reconstructed channels, Outfall Scour Protection, Retaining Walls, Water Quality Facilities, Streambed Rebuilding, Underground Detention Storage, Replacement Culverts PROGRAMS Greenway Management Procedures & Program & Partnerships PARTNERSHIPS & EDUCATION Educational materials & website info, partner with CWS Cleanwater Heroes grant program,
How TRWC Can Help: City Website: Provide Input on Good Stuff, Problems, Solutions on Interactive Map Keep Updated & Look for More Opportunities to Provide Comments on Draft Recommendations Email to Lori or Carla: Ideas & Photos Related to Greenway Management Partnering Ideas Contact & Website Address are on the handout