Dam Liner Calculator

Grekkon Limited’s HDPE dam liner calculator in Kenya  is an easy to use formulae for liner measurements. We guide growers on their liner selection and area size calculation for water pans and tanks, be it for crop irrigation or fish rearing ponds.  Having the right size ensures that installation works are easily done, you get value for money, and that there is no excess unused liner material lying about. The size of  the liner material is the same irrespective of the thickness of the dam liner.

What is a good thickness for a dam liner?

Below are the factors that determine the choice of liner thickness

• size of the reservoir. The larger the capacity, the thicker the liner needed to hold the large water weight
• surface texture. smooth surfaces (soil or cemented surfaces) are for the 0.5mm thick dam liner. Surfaces with murram or small stones with the 0.75mm thick liner, and those with stones or rocks with the 1mm or thicker liner. This is because the thicker it is, the harder it is to tear

Your choice of calculator depends on the shape of the water pan or tank

How Are Dam Liners Calculated?

Before determining the dam liner size, one must understand the size of the reservoir or tank. This is by measuring the length, width, and depth/ height (for rectangular or square shaped reservoirs/ tanks). For circular or cylindrical tanks/ reservoirs, measure the diameter, and the depth/ height. The reason this is key is because our dam liner material comes in rolls. To make out the shape of the water pan or tank, the dam liner is cut  in large bits from the roll and joined together. This is to create the 2 dimension size of the water reservoir or tank. For example; if the width of the dam liner on the roll is 8M, and the water pan requires a width of 15M. Then 2 pieces, one measuring 8M and another 7M in width from the roll are cut and joined to create the 15M width

How Do I Calculate How Much Dam Liner I Need?

The dam liner calculator is adapted to the shape of the irrigation water reservoir as illustated in the 3 different shapes below

1. Sloped sides reservoir

The slope of the dam wall is shown as slanting length (SL) or slanting width (SW) in the dam liner calculator tabulation shown later in this page

2. Cylindrical circular tanks

3. Straight side reservoirs

Pond Liner Calculator: Table

If your totals include a decimal say 120.3sq, round it up to the nearest whole number, in this case 121M sq. The +0.6M in the ‘circular liner’ and is the overlap. So is the 2M in the straight side liner’

“D” is the maximum depth which is the center-most point of the reservoir

Dam Liner Calculator

How much overhang should a pond liner have?

An overhang is the extra liner material that holds the main liner in the reservoir or tank. This excess material is held against the external wall of the tank, or tucked in a trench all around the reservoir to support the dam liner in place. It is covered with soil or stones in the trench.  Another alternative to trenching is to lay sand bags on it. The weight of the sand bags holds the dam liner in place

After excavation, it is necessary to compress the mould of soil roundabout the water pan before making a trench

See below