The article discusses how drainage systems in the Polissia zone are affected by changing climate conditions. The researchers analyzed different methods for calculating drainage module, an important factor for soil drainage. They found that traditional values for drainage modules are not optimal, as they only consider operational factors and not economic or environmental effects. The study showed that drainage module values vary over time and space, and proposed new optimal values based on natural and agricultural conditions. These new values take into account critical conditions like maximum daily rainfall levels.