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Water level measuring

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This topic contains 2 replies, has 3 voices, and was last updated by  Rene Schieritz 3 years, 8 months ago.

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  • #1204

    Elle Inad
    Participant

    Hi,
    I’m a hydrologist and need to find a way to measure the maximum water level from over 200 water level meters.

    Currently, after a rain event we have to go out and take readings at each of those stations. As you can imagine, that’s a big PITA.

    I want to be able to establish a wireless communication network and pass on those readings to a remote data logger or similar.

    The wireless network is not the issue. I can develop that. But taking the readings is.

    I will try to describe the existing method of measuring the water levels. Imagine a long, square and hollow tube. Inside that tube is a removable sleeve with small cups attached which fill with water as the river rises. The water enters through a small hole in that tube, rises up and fills each cup until maximum water level has reached, and the level falls again. At this point, we go out, open a door that enables access to the sleeve with the attached cups, we slide out the sleeve and measure up to what level the water filled the cups. This gives us the maximum water level reached in that river.

    Simple enough, but doing this across potentially hundreds of such devices, is really not awfully motivating.

    Any ideas of what sort of sensors I could use and how to set them up inside to obtain the maximum water level? The size of the tube is about 120 mm x 120 mm. I can take out the inner sleeve to provide more room inside.

    I”ve seen one solution that uses a differential pressure sensor where one end is attached to the bottom of the tank ( from the outside) and the other end is just a short tube for atmospheric pressure measurement. This is apparently the best solution for a water tank. This isn’t so good for a ‘tank’ that gets submerged and thereby submerges the pressure sensor equipment box.

    Suggested solutions?

  • #1216

    davemont
    Participant

    Hi Elle,
    Vented pressure sensors going to a logger box out of range of flow is one option, Ultra sonic distance measure is another, which avoids problem of freezing etc. Both could easily give you continuous, real-time measures which you may find much more valuable than peak stage only. Not sure about your budget, but driving to all the stations each time for peak stage seems costly. Go to the Blog section on this site, then under catagories, select Gadget Showcase. Page through and check out the Ultra sonic setup Shannon Hicks has been working on. Hope this helps.
    Dave

  • #1248

    Rene Schieritz
    Participant

    Hi Elle,

    I’m trying out a capacitive sensor (similar to this instructable: https://www.instructables.com/id/Capacitive-Fluid-Level-Sensor/). I’ve got some pretty good readings so far, but I’m still doing more tests. Would something like this be of interest? Although I’m not sure if you’d want to go through making 200 of these!

    Regards,

    Rene

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