Canal Lining Saving & Seal the Leak, Gain Land
Saves seepage
“This tool gets better every time someone says what confused them.
Enter unlined and lined seepage rates, wetted perimeter, length and season days to get the unlined loss, lined loss, water saved and the percentage saved.
Value of lining the canal
Next: lining this reach recovers about 12,960 m³ a season (90%) — weigh that against the lining cost and command-area gains.
Seepage rates depend on soil, water table and liner condition; cracked or old linings leak far more than the design figure used here.
Canal lining saving — key facts
- Water saved
- (unlined − lined) × WP × L × days
- Unlined seepage
- Often 30–50% of flow
- Unlined rate
- ≈ 1–3 m³/m²/day
- Lined rate
- ≈ 0.1–0.3 m³/m²/day
- Raises
- Conveyance efficiency
- Saved water
- = extra command area
- Best on
- Sandy / leaky soils
- Privacy
- Runs in your browser; nothing uploaded
Every metre of seepage you stop is land you can irrigate
On permeable soils an earthen canal can lose a third to a half of its water through the bed and banks before it ever reaches a field. Lining the canal with concrete, masonry or membrane seals that leak, slashing seepage to a fraction of its former rate. The water you stop losing is real and usable — it raises conveyance efficiency, ends the waterlogging beside the channel, and frees up flow to irrigate extra command area.
This tool multiplies the drop in seepage rate by the wetted perimeter, canal length and season days to give the volume saved and the percentage saved — the numbers that justify the cost of lining and reveal the extra land it can serve. Pair it with the Canal Seepage Loss, Pond Seepage Loss, Irrigation Efficiency and Tank Command Area tools to plan the whole conveyance system.
Stop the leak
Lining cuts seepage to a fraction.
Gain command
Saved water irrigates extra land.
Raise efficiency
More of every m³ reaches the crop.
Justify the cost
See water saved and percent saved.
Frequently Asked Questions
Why does an unlined canal lose water?+
An earthen canal lets water soak through its bed and banks into the surrounding soil. This seepage can swallow a large share of the flow before it ever reaches the field — on permeable soils losses of 30–50% of the diverted water are common. Lining the canal with concrete, brick or membrane seals that leak.
How is the water saved calculated?+
Water saved = (unlined seepage rate − lined seepage rate) × wetted perimeter × canal length × season days. Each seepage rate is the depth of water lost per unit of wetted surface per day; multiplying the reduction by the wetted area and the number of days gives the seasonal volume saved.
What is the wetted perimeter?+
It's the length of the canal cross-section that is in contact with water — the bed plus the two side slopes up to the water line. Seepage happens across this whole wetted surface, so a wider, deeper canal with a larger wetted perimeter loses more water for the same seepage rate.
What seepage rates should I use?+
Use measured rates if you have them; otherwise typical unlined seepage runs from about 1 to 3 m³ per m² of wetted area per day depending on soil, while a good concrete or membrane lining cuts that to roughly 0.1–0.3. The bigger the gap between unlined and lined rates, the more lining saves.
What is conveyance efficiency?+
Conveyance efficiency is the fraction of water that survives the trip from the source to the field. Seepage is the main loss in transit, so reducing it with lining raises conveyance efficiency — meaning more of every cubic metre diverted actually reaches the crop instead of disappearing into the ground.
How does saved water become extra command area?+
The water no longer lost to seepage is real, usable water. Divide the seasonal volume saved by the depth of water a crop needs over the season to find how much additional land it can irrigate — the extra command area that justifies the cost of lining.
Does lining have other benefits?+
Yes. Besides saving water, lining stops waterlogging and salinity in lands beside the canal, reduces weed growth and maintenance, lets water flow faster in a smaller section, and improves the reliability and equity of supply to tail-end farmers who otherwise get little.
Is lining always worth it?+
It depends on soil and seepage. On tight clay soils that already leak little, the savings — and the payback — are small. On sandy or fissured soils with heavy seepage, lining can save enormous volumes and pay back quickly. Run your own rates here to see whether the saved water justifies the cost.
What lining materials are used?+
Common choices are cast-in-situ concrete, precast slabs, brick or stone masonry, and flexible membranes such as LDPE or HDPE geomembrane under a soil cover. Each has different cost, lifespan and seepage performance; the lined seepage rate you enter should reflect the material and its condition.
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