Gary,

A good indicator when you view the sites that have data on stream flow rate is a
comparison to the historical flow. That is, if the 'normal' rate is 100 cf/m and
the present rate is 400 cf/m, you know the waterway is apt to be challenging.
When you know a river and it characteristics, the flow rate becomes much more
meaningful since you have a point of comparison to what you've experienced
before.


Graham

----- Original Message ----- 
From: "Gary Miller" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, June 04, 2004 6:20 AM
Subject: Re: [TXWWFF] Flow Rates for Fishability


> Makes all the sense in the world, Jack.  So I'm thinking the velocity, not
> the volume of water is what we're looking for as wading anglers.  I guess
> calling ahead to check out the river conditions is the way to go rather
> than relying on a cfs chart.
>
> - Gary
>
> At 10:50 PM 6/3/04, you wrote:
>
> >Gary
> >
> >I hope I'm not insulting your intelligence here, but cfs means cubic feet
> >per second.  That's the (number of) cubic feet of water that passes a
> >given point in the river in One second.  As a fur instance, suppose you
> >have a riverbed with a cross section of 100 square feet, ie 1 foot deep
> >and a hundred across, or 2 and 50, etc.  A flow rate of 100 cfs means that
> >100 cubic feet of water goes past in one second, or the river is flowing
> >at 1 foot per second.  Pretty easy fishing.  At 500 cfs this same section
> >of riverbed would have a speed of 5 feet per second.  Just try and stand
> >up in that!  Going the other way, a 100 cfs flow on a streambed with a
> >cross section of only 20 sq ft would have the 5 foot per second
> >speed.  Back in undergraduate studies, we had to measure just this -
> >guesstimate the cross section of the river by taking depth measurements
> >and width measurements, then measuring the flow by letting something drift
> >in the current for a set period of time and tape measuring it.
> >
> >What I'm trying to say here is that cfs by itself doesn't tell me anything
> >significant.  You need to know the shape of the river at the point you are
> >fishing.  I know that the Guadalupe is pretty easy wading at 200 cfs, and
> >very tricky to dangerous at 500.  Actually, thinking about it, the Guad
> >would be pretty close to your hypothetical 100 sq ft cross section most
> >places I wade.  Some are wide and shallow, others up to hip deep and
> >narrow.  The really big holes (very large cross section) would have a
> >greatly reduced flow speed, but the cfs rate would still be the same.  And
> >as the cfs goes up, the depth, hence the cross section goes up.  When the
> >Guad was running at 135,000 cfs a couple of years ago, the depth was
> >probably up around 50 feet in places, and width a quarter mile.
> >
> >Clear as mud yet, or want me to confuse you some more?
> >
> >Jack
> >Austin
> >Gary Miller wrote:
> >
> >>For those of you who are savvy about such things, what is an acceptable
> >>flow rate for wade fishing in rivers and streams?  I want to know such
> >>things as maximum flow rate for safe wading, drifting, etc.
> >>
> >>Thanks.
> >>
> >>- Gary
> >>
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