Difference between revisions of "Design sequence flow chart"
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| − | <font size=5>[[Design sequence flow chart# | + | <font size=5>[[Design sequence flow chart#Does the project create one acre or more of new and/or fully reconstructed impervious surfaces?|Begin Flow chart]]</font size> |
| − | == | + | ===Does the project create one acre or more of new and/or fully reconstructed impervious surfaces=== |
| − | Does the project create one acre or more of new and/or fully reconstructed impervious surfaces | ||
*[[Design sequence flow chart#Goal does not apply|No]] | *[[Design sequence flow chart#Goal does not apply|No]] | ||
*[[Design sequence flow chart#Linear project|Yes]] | *[[Design sequence flow chart#Linear project|Yes]] | ||
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___________________________________________________________ | ___________________________________________________________ | ||
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===DWSMA=== | ===DWSMA=== | ||
Is the site located in a DWSMA, wellhead protection area, or near a drinking well? | Is the site located in a DWSMA, wellhead protection area, or near a drinking well? | ||
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===Karst, shallow groundwater, shallow bedrock=== | ===Karst, shallow groundwater, shallow bedrock=== | ||
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| + | ===The MIDS performance goal does not apply=== | ||
Revision as of 21:25, 14 November 2013
This is intended to take you through a design sequence that allows you to determine the appropriate performance goal at a site. Follow the questions below sequentially to arrive at a performance goal appropriate for your site.
Contents
- 1 Preliminary information
- 1.1 Conduct site review
- 1.2 Define treatment goal
- 1.3 Does the project create one acre or more of new and/or fully reconstructed impervious surfaces
- 1.4 DWSMA
- 1.5 Utilities, structures, land use requirements
- 1.6 Karst, shallow groundwater, shallow bedrock
- 1.7 The MIDS performance goal does not apply
Preliminary information
Conduct site review
- Aerial photos and topographic maps
- County soil surveys and other soil information as available
- County Geologic Atlas
- Local groundwater levels
- DWSMA and Wellhead Protection maps
- FEMA and local floodplain maps
- Soil borings and site survey
- MPCA listing of potentially contaminated sites
- Phase 1 and 2 Environmental Site Assessments
- TMDLs and local water quality standards
- Wetland delineations, MNRAM assessments, and wetland classifications
- Proposed conditions, conceptural/preliminary site design
- Local zoning and land use requirements/ordinances, including stormwater rate control requirements
- Communication with local landowners, LGU, or others knowledgeable about the site
- Site inspection
Define treatment goal
- New and redevelopment projects: Retain on site a volume of 1.1 inches from impervious surfaces
- Linear projects: Retain on site the larger of 1.1 inches from all new impervious surfaces or 0.55 inches from all new and fully reconstructed impervious surfaces
Does the project create one acre or more of new and/or fully reconstructed impervious surfaces
___________________________________________________________
DWSMA
Is the site located in a DWSMA, wellhead protection area, or near a drinking well?
DWSMA1
- Select Flexible Treatment Option
- (FTO) Alternative No. 2
- Revise Treatment Goal
- No infiltration practices allowed
- Provide DWSMA or well location map
Utilities, structures, land use requirements
Are there existing or proposed utilities, structures, or land use requirements (density, parking, setbacks, etc.) that make the Treatment Goal infeasible or cost prohibitive?
Utilities1
Is BMP relocation possible?
Utilities2
Are Flexible Treatment Option Alternatives number 1 or number 2 feasible?
Utilities3
Investigate Off-Site Considerations:
- Banking within watershed with goal of:
- Linear: 0.55 inches over impervious
- Nonlinear: 1.1 inches over impervious
- Cash as determined by LGU
Provide site survey, maps, regulations, and/or cost estimates documenting infeasibility and cost-prohibitive nature of meeting the original Treatment Goal or FTO Alternatives
END
Utilities4
- Select Flexible Treatment Option Alternative No. 1 or No. 2
- Revise Treatment Goal
- Provide site survey, maps, regulations, and/or cost estimates documenting infeasibility and cost-prohibitive nature of meeting the original Treatment Goal