[Sonar] Additional Sonar specific water depth information

[Hans Dickel]

Sonar 810 was pulled just now and we hit dirt bottom along the channel between the cranes (I was able to motor through it slowly).  At the main crane, the boat listed to one side and pivoted as we were hooking up.  Our boat was empty of people (except for to move between cranes), sails, motor, mast, and boom when this was observed.



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Hans Dickel

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________________________________
From: Sonar <sonar-bounces at lists.wyc.org> on behalf of Thomas Brown via Sonar <sonar at lists.wyc.org>
Sent: Sunday, August 22, 2021 8:20:15 AM
To: sonar <sonar at lists.wyc.org>; M Misk <mjmisk at gmail.com>; Jacob Meldman <meldm002 at umn.edu>; Andy Spence-Parsons <andy.spence-parsons at comcast.net>
Subject: [Sonar] Additional Sonar specific water depth information


All:

This email provides some additional information I've gathered regarding the low water situation specifically with the Sonar fleet in mind.     It is not a contradiction or replacement to any of the earlier emails by Andy or Todd on the subject.

I went around and did some soundings of my own at different places on the docs that Sonars are docked, and again around the gin pole and crane.

Here are my findings:

1.  The Sonar draws a shade less than 4' feet

2.  The Capri 25 is draws '4.2' feet which we ascertained to be about 4' 4'' in SAE units.

3.  All of the slips I checked with Sonar's in them on A (full length) and C dock (where the Sonars are)  have at least 5 feet of water,   some around 6'.    F dock where I know 620 is was measured at a shoreward slip and found to be at least 5'.  Conclusion: no problem with depth at any of the slips that have Sonars in them that I see.

4.  The history of the 'low water years'  which you may have heard about were much lower than what we have now.   It was due to an LMCD miscalculation of the water level adjustment at the grays bay dam and not drought.

5.  Depth at the crane is 4' 6'',  but it is a very 'spongy' 4'6''.   The hard bottom doesn't happen until 5'.

6. The gin pole is probably the shallowest which I see at about 4' 4''.    However there are other options to the gin pole if we need it

7. Historically,  cooler weather means cooler surface water temps and less rate of evaporation (far less).     I think June in particular was a particularly high rate of water loss which is not likely to continue.

8.   The tightest place with shallow water is entering the gin pole/crane area is right at the free F dock closest to the shore.   Close to the dock however,  it still around 5',  but be sure to stay close to the dock because it gets shallow qulte quickly shoreward due to the powerboat backwash from the launch.     This is a precaution regardless of low water or not.

As Andy indicates in his email,  in terms of pull out,  the club board has and is exploring 'options' for pull out as needed.   I'll defer all discussion of that to what comes from the WYC board.

What I am going to do myself:

1. Not freak out about the water depth.   It has been worse in the past and it was handled.

2. Keep my boat in.

3. Sign up for the Burton Cup and SofN regatta.

4. Watch the LMCD water level site and read my emails from the WYC board just in case.

5. If other options are necessary for pulling,  I have confidence (and knowledge of some of the options) that the board will facilitate them for the club.    There are a lot of boats that draw more than we do that are in the same situation that cannot be left in over the winter.     The board knows this and will facilitate this or notify us to take action.

Thomas Brown
"Maximizing Business by Minimizing Surprises"
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