A drainage easement gives some "agencies" (like the Town), the right to use a part of your property for a special purpose (like having a drainage system). The agency does not own the property, or maintain the trees, shrubs, or grass - only their system. The easement owner has the right to enter your property to inspect their system and perform maintenance of their system. Certain restrictions may prohibit property owners from building in these areas or restrict landscaping or fence placement. If the area needs to be dug up - the easement owner does not have to replace anything that the property owner puts in that area.