water generaotr Mainly used in low flow areas fall, a small river, small dams ... , good for family This type mainly used in low flow areas fall, for example, a small river, small ... dams side and so on. Axial mainly by small-scale hydroelectric generators and impeller coaxial ... , is the water gap, called the head. Small axial-flow machines generally work in the head hydro 1 m -6 ...