Responses to comments

From LID SWM Planning and Design Guide
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Thank you to all of our active community members below, for helping us to make corrections and find additional useful content[edit]

18 April 2019

Snout link is broken

12 April 2019

It looks like there is a unit conversion error in the equation: ST=RVCT×Ac×C×0.1. When I do a unit conversion from mm.ha to m3, I find that the conversion factor should be 10, not 0.1.

7 Feb 2019

There is no "L" in the equation. Perhaps a second equation for a pipe orifice would help clarify that.

  • There were a few typos in the orifice equation, it has been reviewed and we believe that they have all been corrected. That page also has a link to the adapted variation for perforated pipe flow.

20 November 2018

What if different calculation pages were part of the table of contents? So the section could be titled "Calculations" and within that link could be different pages of calculations instructions from area and volume calculations to gradient slope calculations. Also I think the table of contents should be available on the left margin especially when a user is browsing through the wiki site and would like to read another section of the wiki.

  • Thanks Hilary, a category tag of Calculations has been created to help screen for these types of resources. The table of contents is now available on the left menu bar.

20 November 2018

What a great site and resource you have created. It’s a pleasure to be part of it.

  • Thanks Jeff

4 November 2018

While navigating the wiki, I have come across a number of references to using excess water for irrigation on green roofs or rain barrels. However, it may be useful to include information on 'Keyline Design,' first developed by P. A. Yeomans in the 1950's. While geared towards agricultural and pastoral improvement, it has applications in most water management systems.

  • Excellent reference, thank you Alex. I shall create a page explaining these Keyline design principles, some of which I believe are similar to 'micro-grading'.

31 August 2018

Take a look a this address : There's plenty interesting plans with notes to see how to make important changes to the plans following the field reality!

  • GreenGirl subscribes to the same share-and-share alike Creative Commons licensing as we do. We have her website and a few similar resources linked on our Drawings page.

25 July 2018

Do the units check out for calculating the total depth of the stone reservoir? (i.e. should f' be in units of m/hr instead of m/day?)

  • The notation used in the equations on Permeable pavements: Sizing is being brought into line with the other sections of the site. Units have also been checked and brought into line to millimeters and hours as used for the other BMPs.

16 July 2018

I think Table 1 in this article ( would be good for the wiki guide - it explains the traits of vegetation and how they impact hydrology or water quality.

  • Thanks Sylvie, the information from within that article has been used to produce a similar table on the Plants page.

11 June 2018

The term "forebay" has a strong industry connection to SWM ponds, should this page have a different/more specific name?

  • Thanks Alana and Steve, "Forebay" now redirects to the newly named Pretreatment features page as you suggest.

24 April 2018

A general feedback from a french user - I do not know the meaning of the acronym LID, used profusely in this article, making it hard to understand. I think it would be very helpful to have a definition for all the acronyms by hovering the mouse cursor over them, just like you did in the sixth paragraph of "Targeting hard surfaces" with the definition of "Rainwater harvesting". This type of definition should be available for all the acronyms used in every other pages of this wiki, at least once per acronym per page.

  • 'LID' has been added to the terms using the same definition for 'Low Impact Development'. We will continue to look for missing information of this type.

10 April 2018

Do you have any specs for designing berms around a bioretention pond?

23 March 2018

Is it possible to get the the planting list updated to include native species?

  • Certainly! This information will be added as we review the plant tables in summer 2018.

21 March 2018

Is there a reliable set of estimated design infiltration rates for sites where only soil type is currently known? Additional tests will be conducted, but for now we are looking for numbers to begin an estimate, and a reasonable basis for those numbers.

  • The curators of Minnesota's stormwater wiki have conducted a very thorough literature review to establish their suggested values for design infiltration rates[1]. The lowest value on their table for clayey soils is 15 mm/hr, we believe that this is a reasonable estimate for clay soils. Designers may wish to add a safety correction to this number before undertaking their design calculations.

  1. Minnesota Stormwater Manual contributors, "Design infiltration rates," Minnesota Stormwater Manual, , (accessed May 11, 2018).