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• 2020 MS4 General Permit Section 17 MCM 2: Public Participation/Involvement
  ...tees must develop and implement, and existing permittees must revise their current program, as necessary, and :c. date(s), location(s), and estimated number of participants at events held for purposes of compliance with item 17.3;
  4 KB (525 words) - 16:49, 22 November 2022
• TCMA Chloride Management Plan - Prioritizing and Implementing Restoration and Protection - Municipalities
  ...plementing salt savings. The tool will allow an individual to assess their current practices and speculate on potential future practices to understand how to ...the best practices will still have to dedicate time and resources to stay current with the industry. Leading edge operations could consider sharing their exp
  5 KB (737 words) - 16:11, 23 November 2022
• Unified sizing criteria
  ...simple to administer: be understandable, relatively easy to calculate with current hydrologic models, and workable over a range of development conditions and ...problems caused by development sites over the entire spectrum of rainfall events. The unified approach still provides communities with flexibility to develo
  10 KB (1,552 words) - 19:14, 6 December 2022
• Training and webinar schedule
  This page provides information and links to upcoming training and webinar events. We will attempt to update the page frequently. The date of the last update *Note that the table includes past events.
  10 KB (1,396 words) - 22:01, 4 August 2023
• Construction stormwater permit application - FAQ
  ...Construction Stormwater permit search tool will therefore always hasve the current date at the top. ...y to explain the “messages” is to go through the normal sequence of system events when someone applies for CSW permit coverage online
  7 KB (1,200 words) - 15:27, 11 January 2023
• Definitions for stormwater and rainwater harvest and use/reuse
  ...in and also to evacuate floating pollen and debris in the tank during rain events. ...would not otherwise occur and is therefore considered a valuable resource (Current California Water Code 13050-13051)
  5 KB (771 words) - 15:42, 5 December 2022
• TCMA Chloride Management Plan - Prioritizing and Implementing Restoration and Protection - Citizen attitudes and practices
  ...ng driver behaviors to expect a lower level of service during snow and ice events. *Incorporate education on chloride into pre-existing community events (e.g., National Night Out) as much as possible, rather than expecting the p
  11 KB (1,669 words) - 16:11, 23 November 2022
• Recommendations and guidance for utilizing WINSLAMM to meet TMDL permit requirements
  ...one in batch mode, which means that it is not modeling individual rainfall events in real-time, and accounting for antecedent moisture conditions for perviou ===Current file data: parameter files===
  31 KB (4,567 words) - 14:49, 4 December 2022
• The left sidebar
  ===Events=== ...list of events. '''NOTE THE MPCA DOES NOT ENDORSE SPECIFIC EVENTS.''' Only events in which the MPCA participates are listed.
  16 KB (2,563 words) - 18:57, 3 December 2022
• Self-audit guidance for Phase II MS4s
  ...form an annual evaluation of all written procedures to ensure they reflect current processes and staff. *Use existing municipal events, like Public Works Open Houses, fairs, or household hazardous waste collect
  11 KB (1,671 words) - 16:06, 21 March 2024
• Assessing the performance of iron enhanced sand filter
  ...ts and sampling of runoff water in response to or between natural rainfall events, and can be used to determine peak flow reduction and pollutant removal eff ...ervice life of the media. [https://conservancy.umn.edu/handle/11299/241682 Current research] is designed to enable a relationship between filter media iron an
  16 KB (2,245 words) - 15:31, 27 December 2022
• TCMA Chloride TMDL - Watershed and Waterbody Characterization
  ===Current and Historic Chloride Concentrations=== ...data for each impaired waterbody were compiled and assessed to understand current and historic water quality. A summary of the assessment is presented in [ht
  20 KB (3,038 words) - 15:57, 23 November 2022
• Events
  {{alert|We only periodically update this page, so the current events section may be out of date. Look at bottom of this page to see date of last ==Current events==
  42 KB (5,832 words) - 18:59, 3 December 2022
• PART VI. Stormwater Management Program Assessment, Reporting and Other Submittals
  ...ater than 0.10 inch rainfall) storm event (estimated build-up and wash-off events). The assessment shall also include estimates of annual and seasonal pollu ...This should include consideration of weather variability including extreme events, extended dry periods, extended wet periods, and storm intensities that may
  17 KB (2,483 words) - 15:12, 3 December 2022
• Channel protection criteria (Vcp)
  ...banks are exposed to a longer duration of erosive bankfull and sub-bankful events ([[References for Unified Sizing Criteria|MacRae, 1993 and 1996, McCuen and ...licate the pre-development frequency of peak discharge rates for all storm events that should provide a high level of channel protection. This approach was c
  41 KB (6,386 words) - 19:17, 6 December 2022
• Climate benefits of Green Stormwater Infrastructure
  ...ing weather, which may render them less effective during the spring runoff events. If the goal of a GSI practice is to infiltrate the spring melt water, then ...d average temperatures. As a result, there are no immediate changes to the current design, construction, or maintenance of permeable pavement. However, over t
  19 KB (2,800 words) - 17:35, 5 December 2022
• Documentation requirements and documents to retain under the MS4 permit
  ...rements you must retain the records for three years beyond the term of the current permit (Permit Part IV C.). Many of these materials will be requested prior | style="background: #E6F2FF" | Public notices for public events.
  13 KB (1,935 words) - 17:37, 1 May 2024
• Questions and answers, January 25, 2017 webinar
  ...harvest systems used for irrigation are not specifically mentioned in the current permit, but the irrigation water may infiltrate through the soil and into u ...a specific event and to dispose of the corresponding amount. Between rain events, application should return to supplemental water only (horticultural practi
  11 KB (1,813 words) - 14:28, 6 December 2022
• Stormwater research
  ...updates this page on a regular basis. For more information about past and current stormwater research projects in Minnesota, visit the following University o ...We encourage interested readers to send their comments on research needs, current/existing research, the Manual, and educational resources to the Minnesota P
  21 KB (3,122 words) - 21:56, 22 April 2024
• Key stormwater sizing terminology
  ...e volume is used to the peak discharges of infrequent but very large storm events to pre-development levels. The 100-year design storm, which has a statistic ...ferent ways. The MPCA uses land cover conditions immediately preceding the current development project as the CGP pre-development
  7 KB (1,143 words) - 12:13, 7 August 2022
• Water quality criteria
  ...um degree of pollutant removal for a defined fraction of stormwater runoff events, which has been operationally defined as 90 percent sediment removal. A 50 ...s/index.php/view-document.html?gid=18984 Construction General Permit]. The current MPCA water quality volume criteria is referred to as the “hybrid rule”
  8 KB (1,248 words) - 19:16, 6 December 2022
• TCMA Chloride Management Plan - Prioritizing and Implementing Restoration and Protection - Chloride reduction strategy
  ...management is complex since every winter event is different. The different events can be a result of the type of precipitation, temperature, longevity of the The tool can serve as both a reporting mechanism to understand the current practices and as a planning tool to understand future practices. The planni
  24 KB (3,565 words) - 16:10, 23 November 2022
• Vegetated filter strips
  Vegetated filter strips are most effective for storm events up to the 1- to 2-year event. The effectiveness of filter strips is reduced ...rip with a lower slope; slopes less than 5 percent are most effective. The current state of Minnesota guidelines are consistent with other published guideline
  8 KB (1,208 words) - 13:52, 10 February 2023
• 2020 MS4 General Permit Section 21 MCM 6: Pollution Prevention/Good Housekeeping For Municipal Operations
  ...tees must develop and implement, and existing permittees must revise their current program, as necessary, and :e. stormwater management training events, including general subject matter covered, names and departments of individ
  11 KB (1,506 words) - 17:42, 22 November 2022
• Credits for Better Site design
  Local authorities should keep in mind that the current MPCA CGP, which expires in 2008, does not incorporate a technique for appli Although not explicitly allowed under the current MPCA CGP, there are situations where a local authority could create a water
  44 KB (6,627 words) - 14:13, 6 February 2023
• Test page mtds
  <font size=2>¹Initial GULD approval date. TAPE approval status and current revision dates can be viewed at WA DOE, [https://ecology.wa.gov/Regulations ...nology Assessment Program – Ecology (TAPE). We compiled data for all storm events for each device. Not all data are included in TAPE’s analysis. For exampl
  9 KB (1,324 words) - 15:11, 1 January 2024
• Aaron test 4
  ...es in temperature (States at Risk, 2015) and longer dry times between rain events. These climate change trends present unique challenges to urban stormwater ..., n.d.), but local trends can be different. The time between precipitation events is also changing, which can lead to drought conditions.
  44 KB (6,214 words) - 16:22, 7 May 2024
• Introduction to stormwater modeling
  ...a BMP, predict downstream effects, or some other hydraulic purpose. These events are further defined in the [http://stormwater.pca.state.mn.us/index.php/Uni ...ol require effective management of a long-term sequence of rainfall runoff events rather than performance under a single design storm event.
  65 KB (9,680 words) - 15:36, 20 February 2023
• Water quantity and hydrology benefits of Green Stormwater Infrastructure
  *Select species appropriate for the local current and future water conditions, which typically combine high rates of biomass ...in total water volume movement and retardation of peak flow from rainfall events. When constructed without an underdrain (as an infiltration practice), they
  31 KB (4,513 words) - 22:10, 16 February 2023
• Available stormwater models and selecting a model
  ...el required to predict large storm events (for flood control), small storm events (for water quality predictions), or both? *Modeler experience: what is the model-specific expertise of current staff? Is there budget to hire an expert?
  28 KB (4,130 words) - 11:36, 2 February 2023
• TCMA Chloride TMDL - Implementation Strategy Summary
  ...management is complex since every winter event is different. The different events can be a result of the type of precipitation, temperature, longevity of the ...fforts. The tool can serve as both a reporting mechanism to understand the current practices and as a planning tool to understand future practices. The planni
  31 KB (4,728 words) - 14:57, 23 November 2022
• Stormwater reuse for irrigation - preliminary modeling analysis
  ...ter-event time (hours) = 10. P8 summarizes results in a series of discrete events. The minimum inter-event time is equals the minimum number of consecutive d .... Additionally, depending on the geographic location within the state, the current climate, and/or the type of plant species that are being irrigated, the app
  21 KB (3,095 words) - 21:18, 21 February 2023
• PART V. Stormwater Management Program
  ...all continue to operate in accordance with this permit and the Permittee’s current Stormwater Management Program. The Permittee shall, upon the receipt of not :: 1) current MS4 permit
  54 KB (7,826 words) - 15:12, 3 December 2022
• Street sweeping for trees
  ...ve been offset by P immobilization into litter by decomposers between rain events." … “careful selection of street tree species and timely removal of lit ...gen can be removed for as little as &#36;28 per pound in targeted sweeping events. They concluded that optimization of sweeping practices is expected to keep
  22 KB (3,194 words) - 18:47, 20 February 2023
• Adapting stormwater criteria for receiving waters
  ...oint, lakes can be divided into three management categories based on their current trophic status and sensitivity to additional phosphorus loads. ...ery little bypass of untreated runoff. In addition, runoff from many storm events is retained within the pond over several storm cycles to help improve phosp
  45 KB (6,677 words) - 13:36, 6 January 2023
• New permit requirements and related guidance materials
  :c. date(s), location(s), and estimated number of participants at events held for purposes of compliance with item 17.3; :d. notices provided to the public of any events scheduled to meet item 17.3, including any electronic correspondence (e.g.,
  36 KB (5,350 words) - 16:52, 8 December 2022
• Planning green stormwater infrastructure projects and practices
  ===Sequence events for GSI planning=== ...r green stormwater infrastructure|<font size=3>Schematic for sequencing of events for green stormwater infrastructure</font size>]]
  66 KB (9,074 words) - 22:00, 21 February 2023
• Process for selecting Best Management Practices
  ...ater treatment suitability. Not all BMPs work over the wide range of storm events that need to be managed at the site, so designers need to choose the type o ...in most communities. Constrained techniques are harder to implement since current local codes impede or even prohibit their use in some communities. Designer
  40 KB (6,039 words) - 14:08, 11 February 2023
• Green Stormwater Infrastructure design strategies and practices for climate resilience
  ...es in temperature (States at Risk, 2015) and longer dry times between rain events. These climate change trends present unique challenges to urban stormwater ..., n.d.), but local trends can be different. The time between precipitation events is also changing, which can lead to drought conditions.
  66 KB (9,146 words) - 16:40, 3 April 2024
• Guidance on what discharges should be included in the TMDL wasteload allocation for MS4 stormwater
  ...discusses recommended procedures for addressing wasteload allocations for current or future municipal stormwater discharges regulated under a National Pollut *The WLA must include all current discharges comprised of drainage from within a regulated municipality or to
  45 KB (7,197 words) - 14:46, 4 December 2022
• Aaron test
  ...es in temperature (States at Risk, 2015) and longer dry times between rain events. These climate change trends present unique challenges to urban stormwater ..., n.d.), but local trends can be different. The time between precipitation events is also changing, which can lead to drought conditions.
  66 KB (9,188 words) - 16:22, 7 May 2024
• Minnesota Stormwater Manual email Updates
  ...n stormwater], presented by Dr. Bridget Wadzuk at the [https://wrc.umn.edu/events/mn-stormwater-seminar#:~:text=Seminars%20are%20held%20monthly%20at,boundari ...itional webinars, visit the University of Minnesota's [https://wrc.umn.edu/events/mn-stormwater-seminar Minnesota Stormwater Seminar and Research Spotlight S
  73 KB (10,517 words) - 17:44, 19 July 2023
• Assessing total suspended sediment and total phosphorus removal efficiency of permittee owned/operated constructed stormwater ponds
  .../ Minnesota Geospatial Information Office] (MnGeo) maintains a database of current and historic land use which can be used to evaluate land use and estimate i :P_j = fraction of rainfall events that produce runoff (default value of 0.9);
  85 KB (12,688 words) - 10:05, 26 January 2023
• Design, construction, operation and maintenance specifications for vegetated filter strips
  ...will ensure that the site is stabilized after construction. Following rain events, additional inspections and possible maintenance on the full-treatment BMP ...s designed and require only annual inspections and inspections after storm events larger than the 10-year return period.
  36 KB (5,202 words) - 14:24, 6 February 2023
• Scenario for developing a stormwater treatment train for a retrofit site
  ...out for a treatment train scenario for an urban retrofit site. Arrows show current drainage at the site. (source: CDM Smith).</font size>]] ...runoff volume, Total Suspended Solids (TSS), and nutrients as compared to current discharges resulting from a [http://stormwater.pca.state.mn.us/index.php/Wa
  31 KB (4,411 words) - 13:21, 12 February 2023
• Sediment control practices - Storm drain inlet protection
  ...e the acceptable materials and products to protect each type of inlet. The current list of approved/qualified products for inlet protection can be found on th *Inspect inlet protection immediately before and after rain events and snowmelt.
  19 KB (2,788 words) - 12:56, 15 February 2023
• TCMA Chloride Management Plan - TCMA Chloride Conditions - Chloride trends
  ...opolitan Council 2013 Stream Water Quality Summary for the TCMA found that current chloride concentrations within the St. Croix, Minnesota, and Mississippi Ri A multiple regression using both the year and the number of snowfall events in a winter season (precipitation equivalent > 0.01”) as the independent
  21 KB (3,173 words) - 16:32, 23 November 2022
• Calculating credits for stormwater and rainwater harvest and use/reuse
  If we assume that on average there are 3 days between rain events, the volume reduction capacity of the BMP (V) that counts toward a <span ti ...ariables could include design approaches, maintenance activities, rainfall events, rainfall intensity, etc.
  45 KB (6,471 words) - 21:16, 28 July 2022
• Case studies for street sweeping
  ...to streams and lakes. The city also deploys sweepers following large storm events. ...grams are also promoted on these platforms and at local community outreach events. The Adopt-a-Drain program and associated door hangers educate residents to
  48 KB (7,303 words) - 21:37, 22 November 2022
• TCMA Chloride Management Plan - TCMA Chloride Conditions - Chloride sources
  ...peed roadways will typically have higher road salt application rates. Some events may require multiple passes of salt application and increase the applicatio ...This background concentration characterizes runoff that is not impacted by current or historical applications of anthropogenic sources of chloride. Concentrat
  19 KB (2,928 words) - 16:31, 23 November 2022

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