You’re right. Here’s a good discussion: http://www.iugls.org/the-glaciers-are-long-gone-but-theyre-still-affecting-water-levels.aspx. It’s not a huge effect, but it’s not nothing. “… the apparent effect of GIA (Glacial Isostatic Adjustment) accounted for 4-5 centimeters (up to 2 inches) of a 23 centimeter (9 inch) decline in the head difference between Lakes Michigan-Huron and Erie between 1963 and 2006.” That’s roughly 4 centimeters in 40 years, or ~.1 centimeter/year.
From: CnC-List [mailto:[email protected]] On Behalf Of Fair, Mike Sent: Thursday, October 04, 2012 3:37 PM To: [email protected] Subject: Re: Stus-List Great Lakes Water Levels I also believe the whole area is slowly lifting up (rebounding) after being burdened by the weight of a mile or so of ice during the last ice age. Mike Cio Cio San Padanaram, MA From: CnC-List [mailto:[email protected]] On Behalf Of Chuck S Sent: Thursday, October 04, 2012 4:27 PM To: [email protected]<mailto:[email protected]> Subject: Re: Stus-List Great Lakes Water Levels This is an amazing list. Some people may not think it important, but I appreciate the detailed explanation of what is causing Great Lake water level problems, and the detail of why is just excellent. Now I think I understand. And no joke, water levels are totally sailing related. Thanks, Chuck Resolute 1990 C&C 34R Atlantic City, NJ ________________________________ From: "Walt Dickie" <[email protected]<mailto:[email protected]>> To: [email protected]<mailto:[email protected]> Sent: Thursday, October 4, 2012 3:49:22 PM Subject: Re: Stus-List Great Lakes Water Levels Absolutely right. Most people around the Chicago area, where I live, look at the size of Lake Michigan and just assume it has a big drainage area, which it doesn’t. There’s a ridge that runs through the western suburbs that demarcates the lake’s drainage from the Mississippi’s. When I go downtown I go past the sign marking the “Continental Divide” in Oak Park, IL; it’s about 2 miles from my house and 10 miles from the shore. The rain that runs off my roof goes into the Gulf of Mexico, not the lake. From: CnC-List [mailto:[email protected]] On Behalf Of Ronald B. Frerker Sent: Wednesday, October 03, 2012 11:26 PM To: [email protected]<mailto:[email protected]> Subject: Re: Stus-List Great Lakes Water Levels Levels on the Mississippi should have no effect. The river watershed is not connected to the Great Lakes. Most of the Great Lakes have little watershed area; well at least in the US. For eg., the Superior watershed only goes back 50mi from the western shore. So a light winter can have a dramatic effect if the flow out of the lake system is normal. And as I believe Fred pointed out, evaporation is a major factor, especially when the watershed area is small relative to the surface water area. Usually there is little maneuvering room for changing dam releases on the upper Miss. The changes are usually made on the big dams of the Missouri since 40% of the lower Miss' summer flow is from the Missouri. Ron Wild Cheri C&C 30 STL --- On Wed, 10/3/12, Chuck S <[email protected]<mailto:[email protected]>> wrote: From: Chuck S <[email protected]<mailto:[email protected]>> Subject: Re: Stus-List Great Lakes Water Levels To: [email protected]<mailto:[email protected]> Date: Wednesday, October 3, 2012, 5:13 PM Great Lakes water level: Just guessing, but isn't the fall in lake levels due to lower rainfall amounts? Also, didn't they raise the level of the Mississippi (by lowering dam levels upstream to feed it) because they need to keep channels filled for commercial shipping? Chuck Resolute 1990 C&C 34R Atlantic City, NJ ________________________________ From: "dwight veinot" <[email protected]<mailto:[email protected]>> To: [email protected]<mailto:[email protected]> Sent: Wednesday, October 3, 2012 6:07:20 PM Subject: Re: Stus-List Great Lakes Water Levels So what could the government do??? Has someone interfered with nature or what??? Dwight Veinot C&C 35 MKII, Alianna Head of St. Margaret's Bay, NS ________________________________ From: CnC-List [mailto:[email protected]] On Behalf Of Stu Sent: October 3, 2012 1:14 PM To: [email protected]<mailto:[email protected]> Subject: Re: Stus-List Great Lakes Water Levels The main intention of my first email, was to pass along information on what is happening to the water levels in the Great Lakes and to let people know that the governments are doing nothing to improve the situation. Allowing the level in 1 lake to drop another 5 feet is going to destroy fishing, boating and most recreational activities on the lake. Don't shoot the messenger -- point the gun at the politicians. Stu ________________________________ No virus found in this message. Checked by AVG - www.avg.com<http://www.avg.com> Version: 2012.0.2221 / Virus Database: 2441/5307 - Release Date: 10/03/12 _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]<mailto:[email protected]> -----Inline Attachment Follows----- _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]<about:blank> _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com [email protected]<mailto:[email protected]>
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