Bothell Surface Water Design Manual
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Bothell Surface Water Design Manual
City Hall and the Bothell Operations Center are closed on these furlough days, and staff will not be available by phone or email. If you don’t find the information you’re looking for on our website, please contact us by email whenever possible. City of Bothell appreciates your patience and is committed to providing the best service possible under the given circumstances. City Hall and the Bothell Operations Center are closed on these furlough days, and staff will not be available by phone or email.Learn how you can help. Learn more and view the updated manual. If it's an emergency, call 911. You can see us in your community as we help people fix drainage problems, clean up water pollution and improve stormwater systems. These services are funded by a utility charge paid by people in unincorporated Snohomish County. Learn more about SWM utility charges and billing. Sign up to receive SWM news Stay connected. Sign up to get the latest SWM news sent directly to your inbox. Get quarterly updates about: Upcoming speakers, events and workshops Flood information Water quality findings for lakes and streams Drainage issues Habitat restoration projects Watch the video to learn more. This report includes constructed stormwater LID systems, both private systems permitted by the County and public systems constructed by the County in 2019. Some examples of LID BMPs include rain gardens, bioretention, permeable pavements, roof downspout controls, dispersion, vegetated roofs and water re-use. Learn more: 2019 Snohomish County LID Implementation Report (PDF) The voluntary, non-regulatory program offers funding for small projects on private or public property that will provide shellfish protection benefits in Port Susan or South Skagit Bay. To learn more about the program and access application materials, visit: Discretionary Funds Rebate Program. Please note that funding for rebates is limited and available on a first-come, first-served basis until program funds are exhausted.
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View our newsletter (PDF). Visit the SWM Business Plan webpage to learn more. SWM Director. For Answers or One-on-One Assistance: Snohomish County Public Works Surface Water Management Our mission is to work in partnership with the community to protect and enhance water quality and aquatic habitat, to minimize damage from flooding and erosion, and to preserve water resources for future generations. Exceptions for mechanical equipment and alternative architectural design may be allowed by the shoreline administrator in accordance with BMC 13.07.090, Table 13.07.090-1, footnote A.1. The following standards shall apply: Either design must incorporate the maximum amount of functional grating that is feasible into the deck of the float or platform. If the structure utilizes piles, they must be the fewest number and smallest diameter feasible as determined by engineering requirements. If the structure utilizes a float, the landward edge of the float may be no farther than 10 feet waterward of the OHWM. The mitigation plan shall discuss how the proposed project avoids and minimizes adverse impacts consistent with the facility’s sizing needs. A slope bathymetry map may be required when deemed beneficial by the shoreline administrator for the review of the project proposal. Users should contact the city clerk’s office for ordinances passed subsequent to the ordinance cited above. To view this site, Code Publishing Company recommends using one of the following browsers: Google Chrome, Firefox, or Safari. As such, UW Bothell and CC must comply with Permit requirements, and all relevant ordinances, rules and regulations of the local jurisdiction (City of Bothell). Applicable rules and regulations include the City of Bothell stormwater and drainage control code, Chapter 18.04 and City of Bothell Surface Water Management Program. This document serves as the UW Bothell and CC SWMP.
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The UW Bothell and CC SWMP is designed and implemented to reduce the discharge of pollutants from the stormwater system to the maximum extent practicable and protect water quality. Following each measure description is a list of actions that UW Bothell and CC are conducting to meet these requirements. The dates for completing these actions is available on the City of Bothell Stormwater Maintenance and Inspections Website. Distribution may be by hard copy or electronic means. Appropriate topics may include: Planned discharges will be de-chlorinated to a total residual chlorine concentration of 0.1 ppm or less, pH-adjusted if necessary, and volumetrically and velocity controlled to prevent re-suspension of sediments in the MS4. The discharges will be de-chlorinated to a total residual chlorine concentration of 0.1 ppm or less, pH-adjusted and re-oxygenated if necessary, and volumetrically and velocity controlled to prevent re-suspension of sediments in the MS4. Discharges will be thermally controlled to prevent an increase in temperature of the receiving water. Swimming pool cleaning wastewater and filter backwash will not be discharged to the MS4 To avoid washing pollutants into the MS4, the Secondary Permittee will minimize the amount of street wash and dust control water used. Make the map (or completed portions of the map) available on request to Ecology and to the extent appropriate to other Permittees. The preferred format for mapping is an electronic format with fully described mapping standards. An example description is provided on Ecology’s website. Visually inspect at least one third (on average) of all known outfalls each year beginning no later than two years from the initial date of permit coverage. Implement procedures to identify and remove illicit discharges. Keep records of inspections and follow-up activities. Train all UW Bothell and CC staff who, as part of their normal job responsibilities, have a role in preventing such illicit discharges.
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The UW already has other policy statements that guide sustainable building on campus. Under new state law, state funded construction projects of a certain square footage must obtain LEED certification. UW Bothell and CC will establish maintenance standards that are as protective as or more protective of facility function than those specified in Chapter 4 Volume V of the 2012 Stormwater Management Manual for Western Washington. UW Bothell and CC will review their maintenance standards to ensure they are consistent with the requirements of this section.UW Bothell and CC will develop and implement a Stormwater Pollution Prevention Plan to protect water quality at each of these facilities owned or operated by UW Bothell and CC and not covered under the General NPDES Permit for Stormwater Discharges Associated with Industrial Activities or under another NPDES permit that authorizes stormwater discharges associated with the activity. The training will address. It is required under the federal Clean Water Act by the authority of the federal Environmental Protection Agency (EPA). EPA has delegated its permit authority to Washington State Department of Ecology (WDOE). In fulfillment of the Permit, the City has prepared a Surface Water Management Plan (SWMP). The City s SWMP describes the implementation of programs to protect water quality by reducing the discharge of non-point source pollutants to the maximum extent practicable (MEP) through application of Permit-specified best management practices (BMPs). The practices specified in the Permit are collectively referred to as the Stormwater Management Plan and grouped under the following Program components: 1. Public Education and Outreach 2. Public Involvement 3. Illicit Discharge Detection and Elimination 4. Runoff Controls 5. Pollution Prevention and Municipal Operations and Maintenance 6.
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Monitoring Public Education and Outreach is designed to reach specific audiences based on daily activities that create stormwater pollution. Audiences include the general public, businesses, homeowners and their landscapers, developers, engineers, planners, and contractors. In order to be as efficient as possible, the City uses proven social marketing techniques that have been utilized in social services, public safety, and disease prevention for many years. City programs at Bothell educate audiences about our water quality issues and establish a level of basic education concerning watersheds, stormwater, and the water cycle. For the ongoing behavior change programs, at least one targeted audience in one subject area is evaluated to determine the current level of understanding and adoption of targeted behaviors overtime. The results will be used to direct future education and outreach efforts most effectively. Public Involvement is actively sought in the development of the SWMP. Citizen involvement increases understanding and creates a sense of responsibility towards the health of affected watersheds. Citizens may review and comment on the SWMP by visiting the City of Bothell s website at Illicit Discharge Detection and Elimination efforts focus on discharges that are not entirely composed of stormwater. Investigations and response actions to illicit discharges are designed to detect, remove, and prevent illicit discharges. The City adopted an ordinance and penalty schedule to prohibit non-stormwater or other illegal or illicit discharges 4 Illicit connections (e.g., interior floor drains, etc.) that are connected to a stormwater system will be investigated using a systematic survey. Training has been developed for and provided to City staff based on their likelihood of encountering illicit discharges. Runoff Controls for new and redevelopment have been established.
Ordinances were adopted, a training program was established for plan review staff, construction inspections standards were improved, and efforts were initiated to prioritize the use of low impact development techniques (LID). A timeline has been prepared to address the obstacles and barriers regarding LID implementation. Pollution Prevention and Municipal Operations and Maintenance and activities have been developed to reduce and eliminate polluted discharges from City maintenance and operations divisions. The City has an annual inspection program of all City-owned or operated stormwater treatment and flow control facilities. Work performed by the City on roads, sidewalks, and stormwater systems follows industry-wide NPDES Permit approved standards. The City has acquired a programmatic Hydraulic Permit Approval from the Washington State Department of Fish and Wildlife (WDFW) for work occurring in or along streams. A Stormwater Pollution Prevention Plan (SWPPP) was created for our Shop 1 facility and the Public Works Operations Center, which is co-operated with Northshore School District (NSD) Transportation. The SWPPP for the entire co-operated site was created jointly with NSD. Training on the use of BMPs is routinely provided to staff. Monitoring of surface waters is an important aspect of the SWMP. The City embarked on three primary types of monitoring: 1) North and Swamp Creek are monitored to address high fecal coliform bacteria concentrations. The fecal bacteria monitoring is coordinated under WDOE s Total Maximum Daily Load (TMDL) guidelines; 2) In 2010, the City initiated a long-term ambient monitoring and bioassessment program for City streams. The program will develop a baseline of data. This will provide the City a method to track future trends and assess the effectiveness of the SWMP; 3) Stormwater monitoring will use the regional monitoring program run by NPDES Stormwater group.
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The results will be used to evaluate and improve the City s treatment and control of stormwater. The SWMP is revisited annually to provide progress updates and future plans. The desired outcome of all these efforts is improved water quality throughout the City for the benefit of all its citizens. 5 The federal Environmental Protection Agency (EPA) has delegated permit authority to state environmental agencies. In Washington, the NPDES-delegated permit authority is the Washington State Department of Ecology (WDOE). City of Bothell must comply with the Phase II Municipal Stormwater Permit requirements issued to us by WDOE. The Permit allows discharge of stormwater runoff from municipal drainage systems into the State s water bodies (e.g., streams, rivers, lakes, and wetlands) as long as municipalities implement programs to protect water quality by reducing the discharge of non-point source pollutants to the maximum extent practicable (MEP) through application of Permit-specified best management practices (BMPs). The practices specified in the Permit are collectively referred to as the Stormwater Management Plan (SWMP) and grouped under the following Program components, as summarized in the previous section: 1. Public Education and Outreach 2. Public Involvement 3. Illicit Discharge Detection and Elimination 4. Runoff Controls 5. Pollution Prevention and Municipal Operations and Maintenance 6. Monitoring The Permit requires the City to report annually (March 31 st of each year) on progress in Permit implementation for the prior year. The Permit also requires submittal of documentation that describes proposed program activities for the coming year. Implementation of various Permit conditions is phased throughout the five-year Permit term from February 16, 2007 through February 15, The Permit will be revised and reissued at the end of this period. As of December 31, 2012, the City of Bothell meets the initial Permit requirements.
This report is the City s Stormwater Management Program compliance document. The remainder of this 2012 SWMP document describes actions Bothell will take to maintain compliance over the sixth year of the Permit term for Additional Permit information is located on WDOE s website: 6 Many stormwater issues are caused by the everyday actions of people that live in or visit our affected watersheds. While difficult, changing behavior is a cost-effective programmatic solution to surface water pollution. The minimum measures are: A) No later than two years after the effective date of this Permit, the Permittee shall provide an education and outreach program for the area served by the Municipal Separate Storm Sewer System (MS4). The outreach program shall be designed to achieve measurable improvements in the target audience s understanding of the problem and what they can do to solve it. Education and outreach efforts shall be prioritized to target the following audiences and subject areas: I. General public General impacts of stormwater flows into surface waters. Impacts from impervious surfaces. Source control BMPs and environmental stewardship actions and opportunities in the areas of pet waste, vehicle maintenance, landscaping, and buffers. II. General public and businesses, including home-based and mobile businesses BMPs for use and storage of automotive chemicals, hazardous cleaning supplies, carwash soaps, and other hazardous materials. Impacts of illicit discharges and how to report them. III. Homeowners, landscapers, and property managers Yard care techniques protective of water quality. BMPs for use and storage of pesticides and fertilizers. BMPs for carpet cleaning and auto repair and maintenance. Low Impact Development (LID) techniques, including site design, pervious paving, and retention of forests and mature trees. Stormwater pond maintenance. IV.
Engineers, contractors, developers, review staff, and land use planners 7 Low Impact Development (LID) techniques, including site design, pervious paving, and retention of forests and mature trees. Stormwater treatment and flow control BMPs. B) Each Permittee shall measure the understanding and adoption of the targeted behaviors for at least one targeted audience in at least one subject area. The resulting measurements shall be used to direct education and outreach resources most effectively, as well as to evaluate changes in adoption of the targeted behaviors. C) Each Permittee shall track and maintain records of public education and outreach activities. Goal The goal of the education and outreach program is to reduce or eliminate behaviors and practices that cause or contribute to adverse stormwater impacts. Overview The City of Bothell has chosen to utilize social marketing strategies to illicit behavior change as this has been proven highly successful for Phase I jurisdictions and has been used for over forty years in the realms of social services, public safety, and disease prevention. Targeted Emphasis Outreach The City of Bothell began planning an outreach strategy to encourage adoption of target behaviors among the target audiences concerning stormwater pollution BMPs in Specific outreach strategies to measure adoption were tailored using successful social marketing strategies and were initially focused on the resident target audience. Information was gathered from several outreach coordinators in surrounding cities, as well as our county coordinators, and combined with our past research findings to assess initial behaviors.
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The current emphasis areas include: Resident Target Audience o Natural yard care o Car washing o Pet waste o Septic system maintenance o Youth stormwater and water quality awareness education o Landscaping and buffers o Hazardous material use, storage, and disposal 8 The City conducted an evaluation survey in 2012 to assess current awareness and behaviors for most existing emphasis programs and is revising our outreach efforts according to these findings. On newer emphasis topics, the City is working with surrounding jurisdictions to create a sub-regional outreach program. This will allow for sub-regional evaluation, fielding, and refinement to reduce program cost. The long term goals for each emphasis topic were planned as follows: 9 The website is one of several media sources being used for the dissemination of pertinent information about public workshops, volunteer involvement, and public hearings regarding the affected watersheds to foster direct involvement and communication with local communities. The City will continue its collection and retention of information received from participants at these forums and will present them in Appendix B. Public involvement increases understanding of local water quality issues and creates a sense of responsibility for the health of the affected watersheds. The City s NPDES Phase II SWMP shall include ongoing opportunities for public involvement and may include, but not be limited to, advisory councils, watershed committees, participation in developing rate structures, or other similar activities. The City shall comply with applicable State and local public notice requirements when developing its SWMP. Other opportunities for public participation occurred at several public outreach events in 2012; Natural Yard Care workshops, Sustainamania, a City Council session, and Riverfest in Bothell. These outreach BMPs resulted in few comments received.
Citizens asked questions at the events and wished to be informed, but they did not provide comments on the plan. We will continue to solicit input at events with modifications, such as offering the executive summary with an easy fill-in comment form, to encourage the general public to provide comments. In reaction to the lack of response and input, the City has developed and implemented new BMPs each year in an effort to determine which outreach method solicits the best response. Past efforts included an open house, volunteer and festival events, utility billing inserts, local newspaper articles, social media posts, and continued online outreach to disseminate the SWMP and solicit participation by Bothell s citizens. In July 2012, the City enclosed an insert in a sewer and water utility bill mailed to over 5,300 citizens within the King County portion of Bothell. 11 The citizens were then directed to answer four questions on the web page. Those who responded to the questions became eligible to choose and receive one of the following incentives: a car wash ticket, native seed packet, edible vegetable packet, or a pet waste bag dispenser. A total of 20 responses were received for the following questions (see Appendix A). What type of non-point source pollution do you feel is the biggest problem for the City. Where would you like to see City efforts focused over the next four years. Respondents overwhelmingly (12 out of 19) identified citizen education and outreach. What is the best way to reach out to the general public. Over half of the respondents (11) said mailers and flyers. Others mentioned events, website,, and workshops. How would you like to be involved in this process. The majority (nine) left no response or responded with being unable to be involved in the process. The remaining respondents indicated they wanted to stay informed, reduce their personal pollution input, and continue to provide comments via and the website.
The common theme was the desire for active and effective education and outreach programs with incentives as a key component to the SWMP. The City is making continued efforts to expand this outreach method to other residents of the City to solicit further comments for the SWMP. The City will continue to make its NPDES Phase II SWMP, the annual report required under S9.A and all other submittals required by this Permit, available to the public via the City s Surface Water Program pages on our website. 12 The permit requires the City to have an ongoing program to detect and remove illicit discharges into the municipal storm and surface water system. The permit required full implementation of an IDDE Program by August Minimum performance measures include: Municipal Separate Storm Sewer System (MS4) Mapping: The SWMP shall include an ongoing program to detect and remove illicit connections, discharges as defined in 40 CFR (b)(2), and improper disposal, including any spills not under the purview of another responding authority, into the municipal separate storm sewers owned or operated by the Permittee. An MS4 map is required. There are three major categories of requirements for this map. The following three figures highlight each of the categories within the City s mapping data set (as seen in Figures 3.1, 3.2, and 3.3). We continue to improve the quantity and quality of data contained within them. The three categories are: 1) The MS4 Itself: This map is to include all known pipes, their outfalls, and structural BMPs that the City owns, operates, or maintains. In addition, outfalls greater than 24 are to also include the following attributes: Tributary conveyances (indicate type, material, and size if known) Associated drainage areas Associated land uses within those drainage areas The City has had a GIS map of our storm and surface water system for some time.
However, the City spent 2011 preparing for this requirement by examining the data set history, identifying where gaps are likely to exist, improving procedures for updating the data set, and identifying areas to programmatically examine for improvements in the upcoming year. 2) All connections to the MS4 authorized or allowed after the Permit effective date. 13 Our GIS map includes private systems connected to the MS4 prior to the permit effective date and continues to add connections from that date forward. Procedures are periodically evaluated to ensure the capture of all connections. 3) Geographic areas served by the MS4 that do not discharge stormwater to surface waters. Our data set shows infiltration facilities and also areas that lack a developed storm drainage system. Our map set will be continuously updated as new infiltration facilities are brought online and other areas are better mapped. The map of Bothell s MS4 is available upon request, and the map products will be posted with the publication of this report. 14 The ordinance includes escalating enforcement procedures and actions BMC (A) (3) Special Penalties for BMC Title 18, Utilities. The City developed a strategy to implement the enforcement provisions of the ordinance. During 2010, new procedures and policies were used that leveraged fines as appropriate. In 2011, procedures were revised to place more emphasis on compliance rather than enforcement, allowing first time offenders to evaluate how their discharge occurred and what they could do to prevent a similar discharge in the future. If they were willing to complete this analysis, the City waived any fines that would have otherwise applied. In 2013, a process to evaluate City codes for their impact on allowing and encouraging LID practices will begin. This is the first of the new requirements under the NPDES Permit that will be addressed by the Illicit Discharge Detection and Elimination program.
Illicit Discharge Detection Program An ongoing program for detecting and addressing non-stormwater illicit discharges and connections into Bothell s MS4 has been fully implemented (prior to the August 19, 2011 Permit deadline). Currently, the City responds to illicit discharge reports from citizens, staff, and other agencies. In other words, response activities are reactive. The program is ready to move the City to a more proactive approach, seeking to find potential discharges that need addressing prior to becoming a problem. One major addition to the program in 2012 was access by a Local Source Control Specialist through grants awarded from WDOE and EPA. This specialist provides technical assistance and outreach to targeted business populations in an effort to be proactive against spills and illicit discharges. Areas of focus for 2012 include restaurants, car repair shops, landscaping companies, and mobile businesses. The field assessments include dry weather screenings, verifying outfall locations, identifying previously unknown outfalls, and detecting illicit discharges. In summer and fall 2010, stream walks were conducted to satisfy field assessment requirements along three stream course centerlines: Horse Creek, Little Swamp Creek, and Perry Creek. In 2011, the City hired two Surface Water interns to complete the remainder of the City s streams and outfall screenings. In 2012, efforts for field assessment focused on identifying previously unknown segments of MS4 through a gap analysis, and screening them as they were identified. In 2013, we will continue to work on the list of gaps identified in Procedures for responding to illicit discharges In 2009, a spill response manual and tracking system for investigations related to surface water were implemented. There were 50 illicit discharge calls in 2010, 29 calls in 2011, and 21 calls in On average, the response time was less than 24 hours.
The Permit requires an investigation within seven days, on average, for complaints, reports, or monitoring information that indicate a potential illicit discharge. Immediate investigations are required for those situations that are emergencies, urgent, or severe. In 2011, a new spill response manual, City of Bothell, Illicit Discharge Detection and Elimination Program Manual 2011, was written and introduced into the program. The manual was further revised in 2012, and will be revised again in 2013 as the program grows. Procedures for tracing the source of an illicit discharge and procedures for its removal The City currently uses the City of Bothell Illicit Discharge Detection and Elimination Program Manual, This manual is based on a template collaboratively written by the cities of Redmond, Woodinville, Kirkland and Bothell. Many of the methods were taken from City of Bainbridge Island s manual and the Illicit Discharge Detection and Elimination: A Guidance Manual for Program Development and Technical Assessments by the Center for Watershed Protection, October Public Employee, Business, and General Public IDDE Education 19 In 2008, the City added a spill hotline, and in 2009 made that hotline available to receive calls 24-hours a day. Although the number is continuously publicized, we have not received a report via the hotline. Most callers report spills to the Public Works front desk or Operations and Maintenance. In 2012, the City expanded its capabilities with a Local Source Control Specialist through grants awarded from WDOE and EPA. The specialist will provide technical assistance and outreach to targeted business populations in an effort to be proactive against spills and illicit discharges. IDDE Program Evaluation and Assessment The program currently meets the minimum requirements of the Permit by tracking the number and types of spills and illicit discharges, the number of inspections made, and feedback received from public education efforts.
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