{"problem": "Low Water Pressure in Urban Areas", "categories": [{"name": "Infrastructure", "color": "#3366cc", "causes": [{"text": "Aging pipes", "color": "#333", "comment": "Over 30 years old"}, {"text": "Undersized mains", "color": "#333", "comment": "Can't handle peak flow"}, {"text": "Leaks in distribution lines", "color": "#333", "comment": "Common in zones 4, 6"}], "comment": "Focus on pipe upgrades"}, {"name": "Demand Surge", "color": "#ff9900", "causes": [{"text": "Population growth", "color": "#333"}, {"text": "Unauthorized connections", "color": "#cc0000", "comment": "Found in squatter areas"}], "comment": "Urban population growth outpacing planning"}, {"name": "Maintenance", "color": "#109618", "causes": [{"text": "Infrequent valve flushing", "color": "#333"}, {"text": "Inadequate pressure zoning", "color": "#333"}]}, {"name": "Energy Supply", "color": "#990099", "causes": [{"text": "Pump outages", "color": "#333"}, {"text": "Fluctuating voltage", "color": "#333"}]}]}