Update: Comments on Memo3/Deliverable 5

All,

You should have all received notification that I've read your memos and provided comments with the rubric on D2L.  If you have questions, please let me know.

There a few comments I want to say because of common errors:

As you refine your work, pay attention to organization. Provide background information on the site.  Make sure your reader is aware of the objectives of each part of your project. Be specific regarding codes and standards. For example, as the the Act 40 Manual (Eaton County, stormwater discharges from industrial areas require a NPDES (or state equivalent) industrial stormwater permit. Thus, if you are recommending that storm water be discharged off site, a NPDES industrial stormwater permit is required.  But what does this actually mean? Details are outlined in the Act 40 Manual p. 126.  You cannot discharge stormwater down the sanitary sewer.

Not sure about what permits are required: See page 32 of the Act 40 Manual. 

Since you are all planning to connect to the BWL main, make sure that you comply with their rules and regulations.  Costs can be found here.

Information on fire flow and hydrants specific to Windsor Township can be found here.  In addition, as most of you have mentioned, the applicable code is the Michigan Building Code 2015 (which for the most part has adopted the International Fire Code, 2018 Edition).  The main issue to deal with now is the number and location of hydrants.

Some of you have asked about the location of the water main, storm sewer, and sanitary sewer. I haven't found the specific requirements in Windsor Township code, so follow MI code:

This is for Ann Arbor but I haven't found the details for Windsor Township, so use this as guidance where the MI Code doesn't provide specifics.

If you're still struggling with sizing the pipes, this document might help. Remember, the water mains flow full under pressure. Use the Hazen-Williams Equation to calculate flow.  Sewer mains and storm drains flow by gravity (typically) and do not flow full.  Use the Manning's Equation to calculate flow.  

Hopefully this is helpful to you.

Stay warm!

Dr. Masten



 

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