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Can Someone Cross Check Figures #12539237 12/15/17 03:15 PM
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Donald Harper Offline OP
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Looking at Choke Canyon:
- Want to know what Contour line to look at that will now be the shoreline as the lake is low.
- Something is not right when looking at the water level tables.
- Says the lake is at 30%.
- Another chart says it is 24.5 ft. below pool.
- That can't be right.

Thanks for your help.
Donald


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Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539261 12/15/17 03:34 PM
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Its right, very shallow water lake and if it drops 4 it will be nothing but a river channel.


If you look at a navionics card then it might be screwed up, they seem to have surveyed the lake when it was 20 low and theres a lot of the map missing.

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539266 12/15/17 03:41 PM
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There is a phone app out there called Lake Level. It shows Choke to be down 24.37 feet.

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539270 12/15/17 03:47 PM
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Slide_R Offline
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Here is a 5 ft interval contour map:
http://www.twdb.texas.gov/hydro_survey/chokecanyon/2012-06/ChokeCanyon_ContourMap.pdf

Look at the 195 ft contour and you should have the "Current" lake.


Robert Oleson
aka Slide_R

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539282 12/15/17 03:57 PM
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epicoutdoors Offline
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When looking at surface area v capacity, they are very different and the changes as a lake falls or rises will be very different from one lake to another depending on each lakes contours and depth.

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539301 12/15/17 04:08 PM
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Donald Harper Offline OP
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All I need to know; looking at Nav. Apps. is:
- At what contour is the shoreline right now.


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Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539327 12/15/17 04:32 PM
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It would be easier to get on your graph and take off 25 from the max/min water highlights.

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539335 12/15/17 04:34 PM
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DALE W Offline
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At the current lake level the shoreline would be around 196

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539421 12/15/17 05:23 PM
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I understand your dilemma Donald. I found that when Falcon showed to be down (I don't remember exactly how many foot) if I set the offset on my Navionics app to match that supposed level, it was not correct for what the actual level of the lake was. I want to say that the difference in where it was supposed to be and where it was was either 7 foot or 17 foot. I spent weeks looking at my app in my spare time, planning my trip accordingly. When I got there, all of my planning went out the window because the lake was so much higher than I had anticipated.


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Re: Can Someone Cross Check Figures [Re: Donald Harper] #12539547 12/15/17 07:39 PM
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Brad R Offline
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Originally Posted By: Donald Harper
Looking at Choke Canyon:
- Want to know what Contour line to look at that will now be the shoreline as the lake is low.
- Something is not right when looking at the water level tables.
- Says the lake is at 30%.
- Another chart says it is 24.5 ft. below pool.
- That can't be right.

Thanks for your help.
Donald


Donald, based on the data, it is correct. You just divide "current" stats on acre-feet of water by surface area, then compare this to full lake stats. I did it and it checks out.

Hmm? I know you are a stickler for mapping accuracy to optimize angling opportunities and I thought I'd share some math that relates to your low Choke Canyon Lake. Some stuff below. It shows that as a foot of additional water level is added to Choke Canyon, it raises the average depth of the lake by a fraction of the full foot, usually falling in the 30 to 50% range. The reason, and this relates to your contour lines, is as a lake adds each foot of water, it increases its area. Again, the attached chart shows that, generally, for each foot of water column added, about 500 acres of additional lake coverage occur. This additional acreage will be concentric . . . increasing its, what, "belt size" around its shoreline. This is what causes the average depth of a lake to drag behind a full foot of column water increase (or decrease). Our lakes have slope. To be 1:1, it'd take vertical walls as shorelines, then your contour lines' depths would change 1:1 with increasing or decreasing water levels.

Anyway, sum up the acres in the far column from 220' to 196' and that is how much acreage has shrunk . . . taking some of your contour lines along for the ride.

Brad


Ft Surface Acres Acre-ft Avg. Depth Gain % Added acreage
195 12,076.00 189,763.22 15.71407917
196 12,567.00 202,085.89 16.08067876 36.66% 491.00
197 13,035.00 214,889.92 16.48560951 40.49% 468.00
198 13,512.00 228,163.52 16.88599171 40.04% 477.00
199 14,005.00 241,915.50 17.27350946 38.75% 493.00
200 14,676.00 256,258.58 17.46106432 18.76% 671.00
201 15,232.00 271,221.97 17.80606421 34.50% 556.00
202 15,737.00 286,712.91 18.21903222 41.30% 505.00
203 16,144.00 302,657.15 18.74734576 52.83% 407.00
204 16,539.00 318,997.48 19.28759175 54.02% 395.00
205 16,954.00 335,741.41 19.80307951 51.55% 415.00
206 17,409.00 352,919.50 20.27224424 46.92% 455.00
207 17,919.00 370,577.35 20.68069368 40.84% 510.00
208 18,453.00 388,763.39 21.0677608 38.71% 534.00
209 18,988.00 407,484.21 21.46009111 39.23% 535.00
210 19,523.00 426,739.82 21.85831173 39.82% 535.00
211 20,058.00 446,530.22 22.26195134 40.36% 535.00
212 20,593.00 466,855.41 22.67058758 40.86% 535.00
213 21,242.00 487,750.03 22.96158695 29.10% 649.00
214 21,722.00 509,245.31 23.44375794 48.22% 480.00
215 22,244.00 531,219.37 23.88146781 43.77% 522.00
216 22,853.00 553,757.42 24.23127904 34.98% 609.00
217 23,558.00 576,956.01 24.49087401 25.96% 705.00
218 24,145.00 600,818.10 24.88374819 39.29% 587.00
219 24,689.00 625,233.93 25.32439264 44.06% 544.00
220 25,173.00 650,178.52 25.82840822 50.40% 484.00

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12540059 12/16/17 03:55 AM
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There are way to many numbers in this thread

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12540076 12/16/17 04:08 AM
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All typed in entered manually and calculated data using paper and pencil. eeks

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12540086 12/16/17 04:21 AM
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And all Donald wanted to know was, what are the right contour lines on the navionics page. I know they arent right, but I dont know how wrong they are exactly. I know they are missing a lot of things that I have found by accident over the years and they make up bridges & culverts where none exist.

Re: Can Someone Cross Check Figures [Re: Donald Harper] #12540131 12/16/17 05:42 AM
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Bobby Milam Offline
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I thought that I accidentally logged into the math forum.

Re: Can Someone Cross Check Figures [Re: Brad R] #12540225 12/16/17 01:16 PM
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Originally Posted By: Brad R
Originally Posted By: Donald Harper
Looking at Choke Canyon:
- Want to know what Contour line to look at that will now be the shoreline as the lake is low.
- Something is not right when looking at the water level tables.
- Says the lake is at 30%.
- Another chart says it is 24.5 ft. below pool.
- That can't be right.

Thanks for your help.
Donald


Donald, based on the data, it is correct. You just divide "current" stats on acre-feet of water by surface area, then compare this to full lake stats. I did it and it checks out.

Hmm? I know you are a stickler for mapping accuracy to optimize angling opportunities and I thought I'd share some math that relates to your low Choke Canyon Lake. Some stuff below. It shows that as a foot of additional water level is added to Choke Canyon, it raises the average depth of the lake by a fraction of the full foot, usually falling in the 30 to 50% range. The reason, and this relates to your contour lines, is as a lake adds each foot of water, it increases its area. Again, the attached chart shows that, generally, for each foot of water column added, about 500 acres of additional lake coverage occur. This additional acreage will be concentric . . . increasing its, what, "belt size" around its shoreline. This is what causes the average depth of a lake to drag behind a full foot of column water increase (or decrease). Our lakes have slope. To be 1:1, it'd take vertical walls as shorelines, then your contour lines' depths would change 1:1 with increasing or decreasing water levels.

Anyway, sum up the acres in the far column from 220' to 196' and that is how much acreage has shrunk . . . taking some of your contour lines along for the ride.

Brad


Ft Surface Acres Acre-ft Avg. Depth Gain % Added acreage
195 12,076.00 189,763.22 15.71407917
196 12,567.00 202,085.89 16.08067876 36.66% 491.00
197 13,035.00 214,889.92 16.48560951 40.49% 468.00
198 13,512.00 228,163.52 16.88599171 40.04% 477.00
199 14,005.00 241,915.50 17.27350946 38.75% 493.00
200 14,676.00 256,258.58 17.46106432 18.76% 671.00
201 15,232.00 271,221.97 17.80606421 34.50% 556.00
202 15,737.00 286,712.91 18.21903222 41.30% 505.00
203 16,144.00 302,657.15 18.74734576 52.83% 407.00
204 16,539.00 318,997.48 19.28759175 54.02% 395.00
205 16,954.00 335,741.41 19.80307951 51.55% 415.00
206 17,409.00 352,919.50 20.27224424 46.92% 455.00
207 17,919.00 370,577.35 20.68069368 40.84% 510.00
208 18,453.00 388,763.39 21.0677608 38.71% 534.00
209 18,988.00 407,484.21 21.46009111 39.23% 535.00
210 19,523.00 426,739.82 21.85831173 39.82% 535.00
211 20,058.00 446,530.22 22.26195134 40.36% 535.00
212 20,593.00 466,855.41 22.67058758 40.86% 535.00
213 21,242.00 487,750.03 22.96158695 29.10% 649.00
214 21,722.00 509,245.31 23.44375794 48.22% 480.00
215 22,244.00 531,219.37 23.88146781 43.77% 522.00
216 22,853.00 553,757.42 24.23127904 34.98% 609.00
217 23,558.00 576,956.01 24.49087401 25.96% 705.00
218 24,145.00 600,818.10 24.88374819 39.29% 587.00
219 24,689.00 625,233.93 25.32439264 44.06% 544.00
220 25,173.00 650,178.52 25.82840822 50.40% 484.00
I am feeling like complete dumb-azz right now. hmmm

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