The specific speed for a turbine is the speed of a geometrically similar turbine which would
1
produce unit power (one kilowatt) under unit head (one meter).
2
produce unit discharge (1 litre/sec) under unit head (one meter)
3
produce unit discharge (1 litre/sec) with unit power (one kilowatt)
4
produce unit head (one meter) with unit power (one kilowatt)