Ground Water Control and Roof Drainage

Consider the volume of water that pours off your roof from rain during a typical year – it can be a huge amount! For example, when a 2,400 square foot roof receives a 1 inch rainfall, approximately 1,500 gallons of water will pour from this roof. If this property receives 35 inches of rain in a given year, 52,500 gallons of water will enter the soil near its foundation.