The researchers studied how water, soil, and nutrients flow in a Himalayan watershed. They used a computer model to predict runoff, erosion, and nutrient loss. By adjusting certain factors in the model, they were able to make accurate predictions for most scenarios. However, the model sometimes overestimated runoff and underestimated erosion during heavy rainfall. This could be because the model didn't consider certain conservation practices or landslides that can happen during heavy rain. Overall, the model did a good job of predicting how water and nutrients move through the landscape, but there are still some factors that need to be accounted for to improve accuracy.