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Shape/Size Info
Pond Size and
Configuration
Don't be fooled by imitations. |
When considering pond size, always build as big as budget allows.
Many koi enthusiasts start with a small pond, and regret that they
did not build bigger to begin with. The more water and filter
volume, the greater number inches of koi that can be maintained
within. An important factor when determining pond size is the
depth. Depth of the pond adds to water volume, controls
temperature, and gives koi hiding room from predators. In the
Northwest the minimum depth of a koi pond should be at least three
feet. However, a depth of five to eight feet provides better
temperature control, and will allow more room for koi to exercise.
Volume of a pond can be determined by the formula "length x
width x depth x 7.5". Included in the depth factor is the
recessed area where bottom drains or drain will be set. This drain
should have a down slope of at least one - two feet. The sides of
a pond also play a factor in volume. Many people include a step
for water plants. These steps can add volume but also can have
negative effects. One problem with stepping a pond edge is that
predators have a shallow point at which to enter. Predators such
as the Blue Heron will perch themselves anywhere in which the
water does not rise above their knees. In most cases sheer pond
sides are recommended for at least a two-foot depth. Plants can be
added if needed by stacking something under their bowl or using
hanging baskets. One other way to add plants if wanted are to
create a separate bog area with overflow water spilling in. |
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Before digging a hole make sure to decide if the pond style is to
be formal or informal. A formal pond can be all or part above
ground surrounded by brick or stone, while an informal pond has a
more natural look residing below ground. After the pond volume and
style has been decided, consider the shape of the pond. The shape
needs to be such that it will not obstruct the circulation of
water. If there are abrupt edges, or thin channels, the flow of
water from the waterfall or venturi (discussed later) will be
blocked leaving dead spots. Dead spots, where water does not
circulate, can be prime areas for bad bacteria to grow. This
bacterial can infect the koi and may cause death. The best shapes
for circulation are ovals, circles, or kidney. When the flow is
unobstructed the circulation helps flush solids and bad bacteria
into the bottom drain so that a proper filter can dispose of it.
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Formulas
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Pond Size
volume=gallon |
Length x Width x Depth x 7.48 =
Volume in gallons
ex. ) 15' x 10' x 5' average x 7.48 = 5,610 gal.
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Pond Size
volume=Liters |
Length x Width x Depth x 1000 =
Liters
ex. ) 4.5m x 3.0m x 1.5m x 1000 = 20250L
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Pond Size round shape
volume=gallon |
Surface area (radius squared) x
3.14 x Depth = gallons
note: radius is half the diameter.
ex. ) 10' dia. x 3'deep = 25 x 3.14 x 3 x 7.48 =
1762gal.
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| Pond Surface Volume |
Length x width = surface area
Surface area is used to calculate filter size if using old
style bay filter. Bay filters should be approx. 1/3
Sa. |
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