Positive Impacts Negative Impacts
• Purification
• Storage
• Hydrological cycle
• Return flows
• Increased infiltration
• Decreased erosion
• Grondwater recharge
• Nutrient recycling • Depletion
• Pollution
• Salinisation
• Water logging
• Erosion
• Nutrient recycling • High level of water security required
• Surface and groundwater pollution