NOTE: The 10 year flood and low flow statistics provided are just indicators. For some uses a more rigorous analysis is required, especially design or water planning purposes.

				7 day low flow		Floods
River	Site	Catchment Area (km²)	Mean Flow	Mean annual	10 year return period	Mean annual	10 year return period
Sth Ashburton	Mt Somers	539	11.2	4.8	3.5	103	181
Rangitata	Klondyke	1461	100	41.7	35.0	1085	2324
Orari	Gorge	522	10.5	2.9	1.8	209	485
Opihi	Rockwood	406	5.5	1.3	0.8	170	331
Opuha	Skipton	458	9.5	2.6	1.6	214	401
Tengawai	Picnic Gds	489	4.1	0.56	0.24	241	574
Rocky Gully	Rockburn	23	0.32	0.075	0.056	15.4	28.6
Pareora	Huts	424	3.7	0.48	0.29	239	568
Waihao	McCullochs	488	3.7	0.34	0.16	298	583
Ahuriri	South Diadem	557	23.8	9.0	7.1	255	434
Hakataramea	Above MHBr	899	6	1.06	0.62	184	363
Waitaki	Kurow	9760	373