Development of sanitary districts for water, sewage, drainage, and refuse control.
D001826:Body Fluids; D004322:Drainage; D005735:Garbage; D006801:Humans; D012499:Sanitation; D012722:Sewage; D014867:Water; D014881:Water Supply
D012722:Sewage; D014867:Water
SANITATION; SEWAGE; WATER SUPPLY