A study in Iraq's Sulak basin used a modified technique to figure out how much water runs off the land after rain. To save time and money, the researchers combined a special computer model with maps. They divided the area into smaller sections and calculated how much water flowed off each one. They found that the slope of the land had a big impact on runoff amounts. Results showed that different parts of the basin varied a lot in how much water they shed. Among the methods used, one called the Williams method gave higher runoff values overall. In January and February, about half of the total runoff happened, mainly due to heavy rain and wet soil.