+jeff35080 Posted February 13, 2003 Share Posted February 13, 2003 I have seen all kinds of benchmarks.... rods, disks, crosses, bolts, etc.. Tonight while finding a cache I found a benchmark disk that I had never seen around here before now. It's a Jefferson County Sanitary Sewer benchmark I never realized they marked sewers with benchmark disks Visit this cache page to see the picture that I took of it: http://www.geocaching.com/seek/cache_details.aspx?ID=54297 I know that it's not unique, but I just found it interesting. Jeff http://www.StarsFellOnAlabama.com http://www.NotAChance.com If you hide it, they will come.... Quote Link to comment
+Kewaneh & Shark Posted February 13, 2003 Share Posted February 13, 2003 That certainly is a different use for a benchmark, however it's not being used as a benchmark in the same sense that the NGS benchmarks are. That one would more accurately be described as an offset point to help the public works department locate the sewer main. The numbers & letters that are stamped into the cap indicate the location to the main, the distance from the beginning of the main, and possibly the diretcion of flow. The stamped text 'PT' & '753+58.39'(guessing on the last four digits) - called the station - indicates where the particular point on the sewer main is relative to the beginning of the main or trunk. That beginning point is commonly labeled as 10+00.00 or 100+00.00 and is generally dictated by the project engineer or public works director. The other stamped text, '20 LT' says that the benchmark is 20 feet left of the sewer main. This is where the direction of flow is possibly indicated - left & right offsets are generally indicated facing downstream. I've never seen sewer lines marked with benchmark disks either. I've seen nails & chiseled crosses before though. This is far and away the most permanent and official point I've ever seen. Usually the offset data is only shown on the construction and/or maintenence plans that the public works department has. Keep on Caching! - Kewaneh Quote Link to comment
+jeff35080 Posted February 13, 2003 Author Share Posted February 13, 2003 Thanks for the info! You guys are a wealth of knowledge and I appreciate the fact that so many are willing to share it with those of us that aren't well-schooled in surveying! Jeff http://www.StarsFellOnAlabama.com http://www.NotAChance.com If you hide it, they will come.... Quote Link to comment
+GEO*Trailblazer 1 Posted February 13, 2003 Share Posted February 13, 2003 Highway Systems are done in the same manner Stations and + Stations Beginning the same 10+00 or 100+00.Highway R-O-W are set on 100 feet stations. WHEN ALL ELSE FAILS *GEOTRYAGAIN* http://www.msnusers.com/MissouriTrails Quote Link to comment
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