aquatic vegetation removal
bottom
city
cleaning works
ecological improvement
ecology
ecosystem preservation
environmental protection
environmental safety
environmental works
excavator
garbage removal
hydraulic engineering
keeping clean
landscaping
maintenance
municipal works
nature protection
overwater equipment
pipe
pond
pond bottom
pond cleaning
pond in park
pond maintenance
pond operation
pond sanitation
sanitary condition
special equipment
technique
urban ecosystem
urban hydraulic engineering
urban infrastructure
urban landscape
urban pond
urban sanitation
water
water balance
water bodies
water clarity
water environment
water environment quality
water procedures
water quality improvement
water resources
water surface
water technology
work