The Maple Valley is located in the northern part of the High Tatras, which is the part of the National Park of Tatras along with the Belian Tatras and the Western Tatras. The National Park of Tatras is exceptional for a number of the reasons. In Slovakia it is the oldest national park. The High Tatras are characterized by its alpine configuration. It is important for the protection of unique fauna and rare flora. Its atmosphere is complemented by the extensive forests. In these, there was a massive damage to the whirlwind, which was overtaken by the National Park of Tatras on 19th November 2004. Over 12,600 hectares of forests were destroyed and damaged. Historically, it is considered the largest wind calamity.The wind calamity negatively affected the forests of the impacted areas in the long term. The large calamity affected areas of forests, began to occupy by bark beetles. This destroyed forest began to lose its functions. It also manifested itself by weakening the hydrological potential of the landscape and the forest in the form of devastating floods resulting from heavy rainfalls. Local floods and changes in surface runoff caused increased soil losses and landslides.The final thesis is focused on the impact of the forest destruction on changes in the surface runoff in the Maple Valley. The thesis brings evaluation on changes in the surface runoff in the Maple Valley after the forest destruction. As a result of this forest destruction it has been the large-scale widespread disruption of the forest functions within its territory. At the same time the assumption was created to investigate and then recorded knowledge of changes in the surface runoff and prediction its condition in the future.