TheSwamp
CAD Forums => Vertically Challenged => Land Lubber / Geographically Positioned => Topic started by: rugaroo on October 17, 2003, 09:50:47 AM
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Ok guys...I am curious as to what to do here...I have just picked up a new job in Riverside County California. The piece of land that I have is 42+/- acres, and about 10 acres of it, I need to digitize contours from a 1960 RFCD (Flood Control) map. Now this won't be too hard that I can imagine, but when it comes to the watershed, I am beyond lost. I know how to go through TME, and have it calculate the watersheds, and then import them, but what the heck are they reall for? And why would I really need to show them? Is there anything else that I would need to do here?
Rug
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I guess nobody knows? I use LDD, but I am lucky, working for a survey company, iI only produce "base maps". I don't get into the engineering end much at all. I do some occasional profiles, alignments and cross sections in addition to my regular topographic stuff, but not often enough.
I just didn't want you to feel like I was ignoring your question, it's just I don't have an answer other than "Jump into the middle of it and see what happens!" Then come back and tell me how to do it in case somebody around here gets a wild hair. :lol:
(That's one thing I like about this site. post a question and get no answer just proves that you ain't the dubest one here.)
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Well I tried a test surface and created my watersheds...here are my results:
Watershed id: 1 boundary seg
Area: 244.552
Watershed id: 2 boundary seg
Area: 13369.8
Watershed id: 3 boundary seg
Area: 3625.86
Watershed id: 4 boundary seg
Area: 20.1458
Watershed id: 5 boundary seg
Area: 114.345
Watershed id: 6 boundary seg
Area: 68.6572
Watershed id: 7 boundary seg
Area: 113.115
Watershed id: 8 boundary seg
Area: 8.95529
Watershed id: 9 boundary seg
Area: 4267.75
Watershed id: 10 boundary seg
Area: 15.2805
Watershed id: 11 depression
Drains into:
Area: 221519
Volume when full: 0
Depth when full: 0
Watershed id: 12 depression
Drains into: 2,14
Area: 2802.57
Volume when full: 877.909
Depth when full: 1
Watershed id: 13 flat area
Drains into: 39,9
Area: 7429.42
Watershed id: 14 flat area
Drains into: 13,11,39
Area: 16195.3
Watershed id: 15 flat area
Drains into: 2,12
Area: 135181
Watershed id: 16 flat area
Drains into: 14,13,2,12
Area: 673.299
Watershed id: 17 flat area
Drains into: 16,14
Area: 24484.9
Watershed id: 18 flat area
Drains into: 15,12,17,16
Area: 2303.57
Watershed id: 19 flat area
Drains into: 14,11
Area: 4504.42
Watershed id: 20 flat area
Drains into: 11,19
Area: 1883.02
Watershed id: 21 flat area
Drains into: 17,14
Area: 557.08
Watershed id: 22 flat area
Drains into: 20,11
Area: 2550.89
Watershed id: 23 flat area
Drains into: 17,14,21
Area: 410.539
Watershed id: 24 flat area
Drains into: 18,17
Area: 1115.35
Watershed id: 25 flat area
Drains into: 24,15,18,17
Area: 2979.13
Watershed id: 26 flat area
Drains into: 17,14
Area: 503.241
Watershed id: 27 flat area
Drains into: 25,15
Area: 5871.39
Watershed id: 28 flat area
Drains into: 7,11
Area: 284.712
Watershed id: 29 flat area
Drains into: 19,20,22,17,11
Area: 5323.07
Watershed id: 30 flat area
Drains into: 1,11
Area: 442.814
Watershed id: 31 flat area
Drains into: 27,15
Area: 762.795
Watershed id: 32 flat area
Drains into: 30,1,11
Area: 1299.07
Watershed id: 33 flat area
Drains into: 4,34,27,11
Area: 295.642
Watershed id: 34 flat area
Drains into: 27,15
Area: 5979.91
Watershed id: 35 flat area
Drains into: 17,27,11
Area: 601.448
Watershed id: 36 flat area
Drains into: 5,11
Area: 281.245
Watershed id: 37 flat area
Drains into: 6,11,36
Area: 472.721
Watershed id: 38 flat area
Drains into: 8,11,37
Area: 4.8411
Watershed id: 39 multi drain
Drains into: 11,9
Area: 3293.62
Ok...lets see if I can depict some of this.
Id = name
Multi drain / flat / depression / bndry seg = drains mult. ways / flat...water flows downhill / hole in the ground / portion on the out lying areas of the surface
Drains into = Which watershed the curent one drains into.
Area....Do I need any more here???
Rug
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I'm not sure I understood your question. Was it what is the purpose of delineating watersheds? Civil engineers worry about watersheds because their size and steepness determine how big culverts gotta be, stuff like that. If that was the question.
Regards,
Bob G.