-KN:RPH la R dc Sdug chu yeu de bve nguon nc,dat,chog xoi mon,han che thien tai,dieu hoa khi hau gop fan bve mtrg sthai.

-PLoai:co 4 loai:

+Can cu vao t/c vai tro,muc tieu va vi tri:RPH dau nguon;RPH chan gio,chan cat bay;RPH chan sog,lan bien;RPH bve mtrg,sthai.

+Can cu theo muc do xug yeu:Vug rat xug yeu:do doc lon,gan sog ho,co nguy co xoi mon manh,co yeu cau cao I' ve dieu tiet nc,noi cat di dong manh,sog bien thuog de doa sx va doi song nhan danco nhu cau cap bach ve pog ho,paj dam bao ty le che phu of R la 70%.Vug xug yeu:do doc,muc do xoi mon TB,paj xdug RPH het hop sx,dam bao ty le che phu of R la 50%.