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Joined: May 2014
Posts: 3,869 Likes: 303
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Joined: May 2014
Posts: 3,869 Likes: 303 |
I did a tr-55 analysis for my pond. It was a bit tedious, but it gave me some real confidence in the design. I used a free computer program, wintr-55, made by the nrcs to do the nitty gritty calcs. You just have to measure your watershed using county mapping with soil types. Then input some other parameters, and wala, it spits out flows for 10, 25, 100 year storms. You can even input spillway parameters for testing.
It told me that during a 25 year storm my water level would rise 1.5 feet to right at the emergency spillway. For a 100 year storm it would flow through emergency. This was enough info for the county lady who gave me the driveway permit to cross the dam.
There are older nrcs techniques using watershed, soil types, slope, etc, that are simpler than the full tr-55. Based on what I've seen, you can expect a 25 year storm in the next 3 years, a 100 year storm in 5 to 10 years, and a 500 year storm in 10 to 15 years. 
Last edited by anthropic; 06/07/16 09:48 PM.
7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160
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