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| Name: |
Maverick
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| Subject: |
Rainfall to Raise Lake 1 Foot
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Date:
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1/31/2008 12:31:09 PM
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OK now that I have figured out that to raise the lake 1 foot we need approx 17,000 cfs. What does this equate to in terms of rain fall amounts?
I think the following calculations are correct, however any engineers out there which want to check my numbers feel free.
Assuming it rained ONLY over the 44,000 acres of Lake Martin AND there were NO other inflows or outflows the number would be 9.20 inches of rain to raise the lake 1 foot.
But we all know the above is not true as there are inflows from the upper Tallapoosa and outflows downstream, but it does put it to perspective that we need a lot of rain / inflows to fill the lake.
Some other interesting facts, to put his further into perspective.
Gallons of water over 44,000 acres in 1 inch of rain - 1.194 billion
Gallons of water in 17,000 CFS - 10.988 billion
(10,988,120,000.00 divided by 1,194,788,654.40 = 9.20)
12 ounces beers to raise Lake Martin 1 foot - 117.2 billion
Anyone know the total acreage of the Tallapoosa Basin ABOVE Lake Martin and BELOW Wedowee? Then we could calc the average rainfall required within the this geographical area to raise Lake Martin 1 foot. Sure it is probably about half of the 9.20 inches. But would be easy to calc know that I have the Exel spreadsheet set up.
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| Name: |
Pier Pressure
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| Subject: |
Rainfall to Raise Lake 1 Foot
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Date:
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1/31/2008 12:41:31 PM
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How do you get 9 inches will equate to one foot? If it were a pool with flat walls it would be a 1 to 1 ratio. Since the lakes surface grows as the water rises there is an inverse amount of water needed to raise an additional inch. Since your assumption did not take runoff as source. And your assumption was that a "super cell" type rain activity actually was 16 miles by 16 miles constant rain...? Unfortunately in real world situations there can't be a measure of any rain which will cause a pre-determined amount of raise...
If it rained an extreme amont in a localized area (2 square miles...) the total effect would not be much but if it rained a little but steadily over the entire lake the result would be much greater...
Look for a high pressure system to stall over the basin....
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| Name: |
Maverick
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| Subject: |
Rainfall to Raise Lake 1 Foot
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Date:
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1/31/2008 12:55:20 PM
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You are correct as way to many variables to calc the real number as right now the surface area is smaller at 476 than at 480. Run of will be greater as the ground becomes saturated, etc etc etc. Plus as I stated the calc was only based on rain falling over Lake Martin and not the entire Tallapoosa Basin.
The point is we need a lot more rain / inflows to fill the lake 1 foot then we are currently receiving and without a lot of rain the lake's fill rate will be continue to be gradual as we have seen.
Point is PRAY FOR RAIN !!!!!
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| Name: |
roswellric
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| Subject: |
Rainfall to Raise Lake 1 Foot
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Date:
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1/31/2008 1:35:14 PM
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You are too too much :-)
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| Name: |
Osms
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| Subject: |
Rainfall to Raise Lake 1 Foot
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Date:
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2/1/2008 12:01:01 AM
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Watershed area for the whole Tallapoosa basin in about 3000 sq miles. Below Harris Dam and above Martin Dam, my SWAG--maybe more WAG would say 800 sq miles.
If Mav were a Wizard he could calculate how many inches of rain it would take over that area of land to raise the lake a foot. My WAG guess is 2" to 3" in a 24 hour period would do the job.
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| Name: |
Maverick
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| Subject: |
Think Your Swag is Off
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Date:
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2/1/2008 10:17:45 AM
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As there are 512,000 acres in 800 square miles. Which would equate to needing .79 inches of rain to raise the wate level 1 foot.
My guess would be somewhere in the neighborhood of 3 or so inches with NO outflows to raise the lake 1 foot. But then again just a guess.
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| Name: |
Osms
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| Subject: |
Think Your Swag is Off
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Date:
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2/1/2008 12:29:14 PM
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Don't forget that coefficient of absorption for.........dirt. The formula for that calculation is a bear.
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