A spring occurs when the pressure of the water causes some natural flow of groundwater into the surface of the earth. As rainwater recharges or enters the aquifer, some pressure is exerted on the water that is already present. Due to this pressure, water moves through the tunnels and cracks present within the aquifer. This water flows out pretty naturally to the surface named springs. If rivers flood, then the pressure that is formed by raising the levels of floodwaters does cause several springs.