Steve Shapson wrote:
I have a pond 25x25 feet by 2 feet depth. A large stream 40 feet long with
a 4 foot height flows into it. How do I figure out what size underwater
pump I will need to make the stream flow fast?
Are there site which help with this math?
You might want to use this info from Pondusa (
http://www.pondusa.com )
as a starting point.
Waterfall Weir Rates
http://www.pondusa.com/hints.htm
I will be experimenting with a stream, this summer.
How wide is the stream?
@ the beginning___
@ the end___
and how deep is it ?
@ the beginning___
@ the end ___
any deep areas in the stream
How big are the areas?
Any pics?
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your pond volume
25 X 25 X2 X 7.5 = 9375 gal
25 X 25 = 625 sq. ft
625 X 2 = 1250 cu. ft
1250 X 7.5 = 9375 gal
stream volume
40 X ? X ? X 7.5= ? gals
any measurements in inches must be converted to feet @ 1" = .0835'
1 cubic foot holds 7.5 gals
I have tried to do some calculating below "please don't shoot me if i'm
wrong"
I'm only fresh out of school :~)
Well! 33 years may not be that fresh. ;~)
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examples:
very rough calculations:
using the 12" weir from the chart as a guide.
If you want a stream flow of about 1" in depth
and say your stream starts out at 14"wide.
A starting point would be 375GPH per Inch of width
375 X 14 = 5250GPH
stream volume:
40' long
2" deep = .167'
14" wide = 1.167'
40 X .167 X 1.167 X 7.5 =approx 60 gal
40 x .167 = 6.68 sq. ft.
6.68 X 1.167 = 7.796 cu.ft.
7.796 X 7.5 = 58.64 gal
60 gal. = 8.0 cu ft
If the stream ( using the above measurements) were shut down you would
need room in the pond
to hold an extra 60 +gal of water. in a pond like yours 625 sq. ft. 2'
deep and 9375gals.
The pond would rise less than 3/16"
Method #1 (gallons)
9375 gal / 24" = 390 gal / inch of depth
195 gal / 1/2 "
97 gal / 1/4 "
73.5 gal / 3/16 "
60+ gal (example "your pond") less than
3/16" rise in pond depth
49 gal / 2/16 or1/8 "
24.5 gal 1/16 "
Method #2 (square foot)
8cu. ft = 96 sq.' 1 inch deep
192 sq' 1/2 inch deep
384 sq' 1/4" deep
512 sq' 3/16" deep
625 sq' (Example "your pond") less than 3/16" rise
in pond depth
768 sq' 1/8" deep
1563 sq' 1/16" deep
Chagoi
http://ourkoipond.com