Discussion in 'DIY - Do It Yourself' started by DrDave, Dec 5, 2009.
oops, that was a crosspost.
eta i will take your word for it, since yours works!
Do you have a pic of the weir? How wide is the opening? As long as the flow from the weir into the pond is greater then the flow from the filter to the weir it should work. Probably twice the size outlet on the weir .
How much water will you be pumping? With my current setup(those two and a third) I could probable have them sit even height. The extra barrel slowed down flow through the mech/bio setup.
the pond will be 6000 gallons, and i'm targeting recyling once per hour.
i don't have the weir yet. i wanted to nail the science down before i picked one because i noticed they have the bottom inlet, and for some reason i always thought you dumped into them from the top.
Ok, at 6000 gallons an hour your might have an issue. I am pumping @3500 gallons through mine. Worse case is you install a ball valve into the filter line that you can controll the flow into the filter and tee off the excess into a spray bay or other water feature..
As long as the waterfall weir is lower than the exit pipe from the doc filter, it will flow, it has to.
Fluid dynamics are not that simplistic.
Nice. It is SO easy to build one of these filters. Thanks for doing the research and making things easy for the rest of us. It is much appreciated. Makes me wonder though... think something like this could ever be used for sewage?
i am looking forward to seeing mine in action!
Fluid dynamics offers a systematic structure that underlies these practical disciplines, that embraces empirical and semi-empirical laws derived from flow measurement and used to solve practical problems. The solution to a fluid dynamics problem typically involves calculating various properties of the fluid, such as velocity, pressure, density, and temperature, as functions of space and time.
Very little of this applies. Gravity prevails unless you are introducing a resistance in the waterfall weir, such as sub filters (which are not necessary). If the weir overflow is lower than the bio filter overflow, water will flow.
maybe fluid mechanics is a better term. what i'm thinking about specifically is hydrostatic pressure, which is a term i forgot about until someone else pointed it out to me a few minutes ago.
Do you understand how gravity works? What kind of answer are you looking for???
I believe Doc Dave is correct, but if you are that worked about it, just make the outlet of the doc filter even, or even above the top of the wier. You shud have no problems at all then.
wow what a jerk
basically it turned out to be a hydrostatic pressure question after i looked around a bit, so now it makes sense. the pressure exerted by a vertical column of water is a function of its height, and once it starts going even just slightly, it creates a siphon effect that continues to pull the remainder.
You know he's a mod, right? He can easily ban you?
oh, i didn't realize being a mod came with the right to be condescending
Well I offered my opinion on the question, so now I think I'm done with the topic, and I don't want to get in an arguement.
Maybe this is a job for Bill Nye.....................................the science guy. RIP
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