North Bethany Drainage Master Plan


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This presentation about North Bethany DMP was given April 12, 2010 at the EWRI/ASCE International Low Impact Development Conference in San Francisco, CA.

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  • UGBs create such a distinct line between urban and rural land uses in Oregon, that the lands made available for urban development through UGB expansions are essentially greenfields. New expansion areas lack necessary infrastructure for basic public services such as sewer and water connections. They therefore must first undergo what is locally referred to as a concept planning process in order to outline a framework for determining a community layout and major infrastructure for needed services.These new areas offer unique opportunities to innovatively plan “from scratch” for qualities such as cohesive community design and efficient delivery of services to relatively large tracts of land. The fundamentals of the planning work are guided by region-wide requirements set forth by Metro which basically require plans that will result in the prudent development of valuable rural resource lands. A key Metro planning requirement is for the average net housing density to be at least 10 units per acre for the residentially-zoned portions of the plan area.
  • North Bethany Drainage Master Plan

    1. 1.  <br />Kevin Timmins, P.E.<br />Carrie Pak, P.E.<br />Andrea Vannelli, AICP<br />EWRI/ASCE 2010 International LID Conference April 12, 2010<br />
    2. 2. What is North Bethany Subarea?<br />Urban Growth Boundary<br />Protect rural land<br />5 year expansion cycle<br />Concept planning process<br />Region-wide requirements set forth by Metro <br />prudent development of valuable rural resource lands<br />Net housing density ≥ 10 units per acre<br />800-acres west of Portland<br />Unincorporated Washington County<br />
    3. 3. “Community of Distinction”<br /> North Bethany will be integrated into the existing, larger Bethany community. It is envisioned that North Bethany be a community of distinction, with … parks and open-spaces, and a comprehensive design approach that integrates neighborhoods with open space, provides a variety of housing choices for a range of affordability levels, highlights community focal points (i.e., civic space, mixed-use node, schools, etc.), and connects them to one another, to adjacent points of interest, and to neighborhoods via multi-modal access routes. … <br /> -Washington County Board<br />
    4. 4. Location Map<br />
    5. 5. Concept Plan (streets & land use)<br />
    6. 6. Natural Drainages<br />ABBEY CREEK<br />ROCK CREEK<br />BETHANY CREEK<br />
    7. 7. Stormwater Approach (3 scales)<br />SITE<br />STREET<br />REGIONAL<br />Protect/Enhance Open Space Natural Resources<br />
    8. 8. Regional Facility Diagram<br />ABBEY CREEK<br />ROCK CREEK<br />Arbor Oaks<br />&<br />Elementary<br />BETHANY CREEK<br />
    9. 9. Linear Corridor Concept<br />REGIONAL<br />STORMWATER<br />VEGETATED<br />CORRIDOR<br />STREAM<br />-OR-<br />WETLAND<br />VEGETATED<br />CORRIDOR<br />REGIONAL<br />STORMWATER<br />Required to be Enhanced<br />to “GOOD” Condition<br />
    10. 10. Stormwater Strategy<br />ABBEY CREEK<br />ROCK CREEK<br />Arbor Oaks<br />&<br />Elementary<br />BETHANY CREEK<br />= SITE LID<br />
    11. 11. Local Street LID Examples [swales]<br />
    12. 12. Implementation<br />FACT SHEETS<br /><ul><li>Design
    13. 13. Construct
    14. 14. Maintain
    15. 15. Educate</li></ul>- $$$<br />Laundry List<br />
    16. 16. LIDA Handbook<br />FACT SHEETS<br /><br />
    17. 17. Standard Cross Sections (Revised)<br />
    18. 18. Public Outreach<br />Technical Advisory Committee<br />Stakeholder Working Group<br />Open Houses<br /><ul><li>Developer Liaison Committee
    19. 19. Citizen Participation Organiation (CPO7)</li></li></ul><li>Maintenance<br />Regional = Local jurisdiction<br />Street = Local jurisdiction<br />Site LIDA<br />Recorded Maintenance Agreements <br />Inspection and enforcement program<br />Privately maintained<br />Public education<br />
    20. 20. Pre-Design<br />Adopt DMP in May???<br />Funding for Regional Facilties (WQ Fee In-lieu)<br />Preliminary Design<br />Phasing<br />Regional Stormwater Facilities<br />Streets and Street LID<br />Acquire easements<br />
    21. 21. Simulated Drainage Master Plan<br />
    22. 22. Contacts<br />Kevin Timmins, P.E.<br /><br />Carrie Pak, P.E.<br /><br />Andrea Vannelli, AICP<br /><br />