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dr_lady_engineer

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Everything posted by dr_lady_engineer

  1. OK so I tried something on a hunch, and it turns out that the strange number 25.1 is apparently the weighted average main channel length between the two basins. This is very, very incorrect and Aquaveo needs to fix it before someone gets hurt. I will be using an alternate method for computing NSS input values.
  2. I'm afraid I'm still scratching my head. I'm not sure that we're talking about the same thing. I have attached an image showing the value I'm talking about, circled in red. The channel length upstream of this point is about 30 miles and the channel length downstream is 2 miles to the next junction, and about 11 miles total.
  3. Thanks for trying to help. Perhaps an example would help clarify things? I have a basin called 14B and the program gives an area, a channel slope, and a main channel length of 27.01 miles (verified as correct). Nearby is basin 16B, which shows a main channel length of 13.1 miles. They both flow into a junction called 27C, which shows appropriately the combined area of the two basins. However, the main channel length is given as 25.1 miles?? It should be the cumulative longest flow path, but I am having a hard time figuring out where 25.1 miles even comes from. It seems like the calculation is working fine on individual basins, but when it comes to junctions, something is different and I can't figure out what. And it's like that throughout the model.
  4. Hi, I've been a heavy WMS user for over 3 years and recently started using the NSS model, and was wanting to know if someone could provide some clarification regarding how WMS is computing the watershed geometric characteristics for input into the regression equations. The regression equations I'm using require an area, a channel slope (at 10/85%), and a main-channel length. I've created a watershed model that is performing satisfactorily, but some of the geometric output numbers are a bit puzzling, specifically the channel length parameter. I've compared WMS output to my own measurements to verify, and sometimes it's a struggle to match any of the WMS numbers at all. I'm referring to both basin-specific channel lengths, obtained by clicking on basin icons, and cumulative lengths, obtained by clicking on outlets. My question is, what exactly is it outputting for that parameter and how is it computing that value? Any information would be very helpful.
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