FAQs

 

How much pond liner do I need?

To calculate how much pond liner you need, start with the length and width of your pond, then add in the depth of the pond twice. (You are going down into the pond and back up the other side) 

For example: an 11'x16' pond will require a 15'x20' liner.


How much rock do I need?

In order to work out how much rock you need, perform the following calculation:

(L in meters x W in meters)/4.1 = metric tonnes of Rock & Boulder.

It's best to use a 1:2:1 Ratio - as an example, for every 1 tonne of 15-30 cm rock, use 2 tonne of 30-45 cm rock and 1 tonne of 45-60 cm boulder. Using a variety of sizes makes the pond look more natural.

Rock Calculation Example:

A 5m x 5m pond needs

(5x5)/4.1 = 6.1 tonnes of Rock & Boulder

6.1/4 = 1.53

Therefore use 1530 Kg of 15-30cm rock, 3060 Kg of 30-45cm rock and 1530 Kg of 45-60 cm boulders.


How much pebble do I need for my pond?

In order to work out the amount of pebbles you need for your pond, you should calculate 30% of the rocks and boulders you are using.

For example: If you require 6.1 tonnes of Rock & Boulder, multiply 6.1 x 0.3 = 1830 Kg or 1.83 tonne of pebbles 1-4cm size.


How much rock do I need for my stream?

To determine the amount of rock you need for your stream, you need to calculate 1.4 metric tonnes of rock per 3m of stream.

For every 3m of Stream use 1.4 metric tonnes of rock using 1:2:1 ratio (see rock calculation above).  

For example, to have a 6m stream into the pond, use 2.8 metric tonnes of rock. You will need 700 Kg of 15-30cm rock, 1400 Kg of 30-45cm rock and 700 Kg of 45-60cm boulders. 

 


How much pebble do I need for my stream?

In order to work out the amount of pebbles you need for your stream, you should calculate 30% of the stream rocks and boulders you are using.

For example: 2.8 tonnes of stream rocks & boulders required (see stream rock calculation above) x 0.3 = 840 Kg of pebbles 1-4cm size.

 

Water & Rock Calculation Chart

You can download the Water & Rock Calculation Chart here.

For the Rock Estimate Chart download here.

If you have any further questions please don't hesitate to contact us.