Topic: Depth ? (Read 317 times)

GETFISHED · « **on:** December 05, 2011, 03:39:10 PM »

Here's some food for thought. I think I know the answer to this but I want to see what yall think.

For starters let's say the lake elevation is currently at 841. The depth in the channel directly above the dam is 75'. The depth in the channel approximately 75% uplake is 37'. The next day the reported lake elevation is 843. What would the depth be at the above two locations ?

Jig Man · « **Reply #1 on:** December 05, 2011, 08:27:11 PM »

I believe the size and configuration of the lake would be a major factor in determining the level up stream. For example in Table Rock 75% of the way up the James is 45 miles while on the Lindley arm of Pomm it is 9 miles.

A big rain at Cape Fair would possibly be drained down before the lake at the dam rose 2' and the level may be back to close to normal, while at Pom the nine miles could be covered, the lake go up 2' and more water still be coming down and the level 75% of the way up could be quite high if it was a flood.

I THINK.

GETFISHED · « **Reply #2 on:** December 05, 2011, 09:22:56 PM »

Oh Now, don't complicate things. Assume the lake level is measured directly in front of the dam over the channel. Assume the next report declares a 2' rise and the lake is stabilized . Would there be a 2' rise in depth at the uplake location ?

Jig Man · « **Reply #3 on:** December 06, 2011, 06:46:52 AM »

As we all know, water runs down hill. So it would run down to the dam. As it fills up it will start to back up. It will eventually seek its own level but not till it backs up so depending on the time frame it could be less than a 2' rise up stream and back up filling to a 2' rise.

I am basing this on the work we have done in the spring branch that runs through one of our farms and seeing how the water reacts when we move gravel around that has flooded in. This occurs in short stretches and would seem to me to be a universal reaction since gravity and water properties are pretty much consistent.

GETFISHED · « **Reply #4 on:** December 06, 2011, 08:16:14 AM »

I think you have the correct perspective and I think I agree with you.

Here's how I look at it.

If you set a glass on the counter and draw a vertical line down the center of the glass. Next mark the left side of the glass and the right side. Pour water in to a desired amount, let's say half. Mark the water level at that point. Next tilt the glass 45 degrees from left to right. Mark the water levels on the left side and the right side equal distances from the center of the glass. Stand the glass straight up again.Next pour in more water to raise the level exactly one inch. Mark the new water level on the glass. Next tilt the glass 45 degrees from left to right. Mark the new level on the left side and the right side and compare. I don't think the additional 1" will be evenly distributed when the glass is tilted at 45 degrees.

Does this make any sense ?

Carter · « **Reply #5 on:** December 06, 2011, 11:09:35 AM »

Fluids assume the shape of their container. No matter the shape. Does this help? Probably not but I thought I would throw it out there.

GETFISHED · « **Reply #6 on:** December 06, 2011, 12:17:19 PM »

UH ............. Yea,

LOL

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Depth ?

Jig Man

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Carter

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