Waterlogging: what it is and how to prevent it

Understanding what it is, what causes it and how to prevent it is essential for maintaining fertile, productive and well-structured soil over time.

In this article, we analyse the phenomenon in a clear and practical way, providing useful guidance on how to recognise and manage it correctly.

What is waterlogging?

Waterlogging occurs when rainwater or irrigation water is not absorbed by the soil and remains on the surface or in the uppermost layers of the soil for a prolonged period. Under these conditions, the soil becomes saturated with water, drastically reducing the oxygen content within the soil’s pores.

Why waterlogging is a problem for the soil

Soil prone to waterlogging gradually loses its structure and biological vitality. Excess water has a negative impact on several key aspects:

- reduced soil oxygenation;

- decreased beneficial microbial activity;

- soil compaction;

- loss of nutrients through leaching;

- increased development of pathogens and harmful fungi;


In the long term, waterlogging makes the soil less fertile and more difficult to work, with direct consequences for crop yields and quality.

The main causes of waterlogging

Waterlogging can have various causes and is often the result of a combination of several factors. Identifying the causes is the first step towards taking effective action.

1. Poor soil drainage capacity

Some soils, by their very nature, retain water for longer. Soils rich in fine particles tend to be less permeable and encourage water accumulation, particularly if they lack good structure.

2. Soil compaction

Repeated passage of heavy agricultural machinery or tillage carried out under unsuitable conditions causes soil compaction. The reduction in macropores hinders water runoff and promotes waterlogging.

3. Incorrect irrigation management

Irrigation that is too frequent or excessive, and not tailored to the actual needs of the crops and climatic conditions, easily leads to soil saturation.

4. Lack of or inefficient drainage

The absence of drainage systems or insufficient ground slope prevents the natural runoff of rainwater, increasing the risk of waterlogging.

Soil types most prone to waterlogging

Not all soils react in the same way to the presence of water. Some types are naturally more prone to waterlogging.

Clay soils are among the most problematic. The high clay content makes the soil poorly permeable, with a structure that tends to retain water and compact easily.

Silty soils can also encourage waterlogging, especially if tilled under sub-optimal conditions. When compacted, silt drastically reduces drainage capacity.

Flat soils or those situated in low-lying areas are more prone to this problem, as water tends to pool in the absence of a natural slope to facilitate its runoff.

How to recognise a problem with waterlogging

Identifying waterlogging at an early stage allows you to take action before the damage becomes irreversible. The most common signs are quite obvious.

The soil appears constantly wet, muddy or has persistent puddles of water, even several days after rainfall. Plants show stunted growth, yellowed leaves and, in the most severe cases, symptoms of root rot.

Another sign is the presence of unpleasant odours in the soil, caused by anaerobic processes resulting from a lack of oxygen.

How to prevent waterlogging: effective strategies

Preventing waterlogging involves proper soil management and the adoption of good agronomic practices.

1. Improving soil structure to prevent waterlogging

One of the most effective ways to combat waterlogging is to improve soil structure by adding organic matter. Compost, mature manure and organic soil improvers help to make the soil more porous and stable, promoting the passage of water and air.

Organic matter acts as a ‘natural binder’, improving the aggregation of soil particles and reducing the risk of compaction. This measure is particularly useful in clayey and loamy soils, which are more prone to waterlogging.

To distribute these materials correctly, equipment such as manure spreaders, compost spreaders and distribution trailers is used, ensuring uniform and controlled distribution across the entire field.

2. Reduce soil compaction through targeted tillage practices

Soil compaction is one of the main causes of waterlogging, as it reduces the number of macropores necessary for water drainage. Carrying out targeted soil treatments helps to restore the soil’s porosity without damaging its structure.

Operations such as scarification or decompaction help to break up the hardest layers of the soil, facilitating water infiltration into the deeper layers. It is important to carry out these operations only when the soil is at the right moisture level, to avoid making the situation worse.

Among the equipment most commonly used by our farmers are scarifiers, subsoilers and decompactors, designed to work at depth and improve drainage without completely turning the soil over.

Our DCV subsoiler, designed for vineyards and orchards, leaves the soil surface undisturbed and removes the plough pan or compaction caused by vehicle traffic, significantly improving drainage capacity and plant health.

This machine, mounted on a tractor via a three-point hitch, allows working to a depth of up to approximately 40 cm, promoting the restoration of porosity and the penetration of water into the deeper layers of the soil.

3. Promote natural drainage through surface tillage

Surface tillage also plays an important role in preventing waterlogging. A well-levelled field with a regular surface structure facilitates the runoff of rainwater, preventing localised pooling.

Light tillage helps to keep the soil aerated and breaks up the surface crust that often forms after heavy rainfall. This promotes water infiltration and reduces the risk of prolonged waterlogging.

In this case, equipment such as rotary harrows, disc harrows and tine harrows is used, which are ideal for refining the soil, levelling the surface and maintaining good surface porosity.

Tillage machines also help to improve drainage, as they break up the soil, making the topsoil more uniform and promoting an even distribution of water, thereby preventing localised waterlogging. Cultivators, on the other hand, allow the soil to be aerated and the surface crusts broken up without excessive turning over, improving water infiltration and maintaining a balanced soil structure.

On stony soils, stone-breaking machines are also used; these help to refine the working bed and create a more even, well-drained surface. A well-prepared surface facilitates the runoff of rainwater and helps to reduce the risk of prolonged waterlogging.

4. Use cover crops to improve drainage

Cover crops are a natural and effective remedy for waterlogging. The roots of these plants improve soil structure, creating natural channels that facilitate water drainage.


Furthermore, cover crops protect the soil from erosion and increase its water-holding capacity, contributing to better long-term moisture management. This approach is particularly useful in sustainable agricultural systems and crop rotations.


Mechanical or pneumatic seed drills are used to sow cover crops, whilst mulchers, harrows or rollers are used for their management and incorporation, depending on agronomic requirements.

5. Install surface and deep drainage systems

In some situations, it is necessary to install specific drainage systems. Surface drainage, achieved through furrows, ditches or channels, allows excess water to be removed quickly and is particularly useful on flat land.

Deep drainage, on the other hand, involves the installation of drainage pipes underground, which are capable of collecting excess water and channelling it away from the cultivated area. The choice of system depends on the characteristics of the soil and the conditions of the site.

6. Proper irrigation management

Proper irrigation management is essential to prevent waterlogging. It is important to adjust the volume and frequency of irrigation to suit the needs of the crops, the soil type and weather conditions, avoiding excessive irrigation that leads to soil saturation.

The importance of suitable equipment and farming practices

Preventing waterlogging also depends on choosing the right equipment and carefully managing farming practices. Machinery designed to operate in a way that respects the soil structure helps to reduce compaction and improve the quality of the work.

Using the right technologies helps to keep the soil better aerated and well-drained, promoting root development and the long-term health of crops.

Final thoughts

Waterlogging is a serious problem, but one that can be prevented with the right knowledge and agronomic practices. Understanding what it is, recognising its causes and taking targeted action enables us to protect the soil and ensure optimal conditions for crop growth.

Careful soil management, combined with correct tillage practices, effective drainage systems and sensible irrigation, is the key to preventing the build-up of excess water. Ensuring proper soil drainage is not just a solution to a problem, but a long-term investment in soil health and productivity.

Do you want to tackle waterlogging with the right equipment?

As we have seen, every type of soil has different characteristics and challenges, and it is essential to choose the most suitable machinery to improve drainage and preserve soil structure.

Not sure which machinery is best suited to your soil? Contact us! Our experts will be happy to answer all your queries and questions on how to tackle waterlogging on your land.