Comments on: Estimation of Water Flow Rate Q Using Average Cross-section

By: Leo Colliaux

Leo Colliaux — Tue, 26 Apr 2011 23:47:37 +0000

Great idea ! however i believe it is an expensive exercise. If you are looking at supplying your quarters only, why not consider building a “Tower-Tank” (depending on hight to give max fall) and harness the water from the stream (no enviro configuration in the fauna) into the tank using pumps driven by “tower tank hydro” .. You’ll not only save but also preserve the habitat.

I say this as i have a “tower -tank hydro” at the hight of 10mtrs, running a modified 8Kva alternator, giving power to the whole house with white goods.

By: binod panthee

binod panthee — Thu, 09 Dec 2010 06:20:03 +0000

i wants to design a small hydro power plant (100kw) what are the procedure to measure the water discharge ,in liter /sec.

By: Jess

Jess — Tue, 21 Sep 2010 00:46:19 +0000

Kyle,

This method employs an empirical approach to measurement. That is the development of the method requires correction factore to calibrate the result so it will even be close. Each factor is chosen based on the surface type and the roughness. Rough surfaces cause turbulence and eddies to form. These will impede flow via increased friction near to the surface.

With that said under some circumstances (high flow rates & tight turns) the flow will detach and all sorts of interesting complicated turbulent stuff happens. For now just know the factors are measurements that correct lab models to fit reality a bit better.

If you want a model that gives a bit more accurate estimate of open channel flow, look at the pipeflow site mentioned on another post on here on “smallhydro.com”… they also have channel flow estimation tools in addition to pipeflow.