No, the swale area is the first line of defense against flooding.
Water is intended to be area.
Paving compounds the flooding condition. Top of Page 2. The city only trims trees when they are creating an unsafe condition for the public or damaging underground utilities, in which case this must be documented by the utility Routine trimming for appearance is the responsibility of the adjacent property owner. Top of Page 3. Only by planting trees or other landscape materials.