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Tips from the experts

Landscape & Gardening

Landscape Calculators

Ponds -

Advice on Ponds

Seasonal Pond Care Summary for Western New York

Spring Pond Opening

Simplest Spring Pond Preparation

Pond Winterization

Blue Herons

How to determine Male or female Koi?

Lava Rock for filter media? What is best

Dividing, replanting aquatic plants

Troubleshooting pond leaks

Building a pondless waterfalls

Repairing a cut in pond liner

Seaming pond liner with 6" Cover Tape

Seaming pond liner with 3" splicing tape

Why Pond Shading or Dye is important

Pond Calculations

Quantity of boulders for a pond

Length x Width / 40 = Tons of boulders

1:2:1 RATIO:

For every 1 ton of 6”-12” boulders get 2 tons of 12” –

18” boulders and 1 ton of 18” – 24” boulders

Quantity of boulders for a stream

1 ½ tons for every 10’ of stream using a 1:2:1 ratio

Quantity of boulders for facing a waterfall

14” – ½ ton of mixed boulders

22” – ¾ ton of mixed boulders

30” – 1 ton of mixed boulders

40” – 1½ tons of mixed boulders

Quantity of boulders for a retaining wall

1 ton of 12” – 18” boulders will cover 10 linear feet

1 ton of 18” – 24” boulders will cover 5 liners feet

Calculating Approximate Water Volume

Avg. Length x Avg. Width x Avg. Depth x 7.48 = ___

Calculating Approximate Water in Motion

Length x Width x (0.25x depth of water) x 7.48 =___

Calculating Gallons Required in a Basin

Total Gallons in Motion x 2.5 = Desired Basin volume

Basin Matrix Capacity

Large Matrix – 4.3 cuft. Holds 32 gallons

Small Matrix – 2.3 cuft. Holds 17 gallons

Example of pondless waterfall basin sizing:

Use the formula :

Length of waterfall x width of waterfall x (0.25 x Depth of water) = how many cubic feet of water you need running down your waterfall, also called water in motion.

Of course, we don't normally measure water in cubic feet. There are 7.48 gallons per cubic ft of water. Muliply how many cubic feet of water from the formula above x 7.48, and you will have how many gallons of water you need.

To find out how much water you need for the entire system, multiply the amount of water in motion you need x 2.5. This will give you enough water to keep the pump submerged at all times, and not have an overflow when the pump is turned off. 

Here is an example:

Length = 10ft Width = 3ft Depth=.5 inch

Calculate Water in Motion: L x W x (0.25 x D) x 7.48

10 x 3 (0.25 x 0.5) x 7.48 = 28.05 gallons

Calculate Total Amount of Water: Water in motion x 2.5

28.05 gallons x 2.5 = 70 gallons

This means that you need a reservoir that can hold 70 gallons of water! For pondless waterfalls, water matrix are a great way to store larger volumes of water in a smaller footprint, which gives you more flexibility on design.