Cause many problems, such as impeding water traffic. Obstacle to drainage occurs. As a barrier to the growth of the fish in the water supply, wildlife is dangerous, etc.
Cause problems such as obstruction of water traffic. Born impede drainage An obstacle to the growth of the fish in the water. The animal shelter is so dangerous.
Cause a lot of problems such as the blocked traffic channel. The obstacle to drainage. Obstacles in the growth of the fish in the water. Dwelling place of dangerous animals.