Nith River flows

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Learn how to read these charts on our River and stream flows page.
This river data can be downloaded from our Data Downloads page.
Download a copy of the brochure Preparing for Flooding: A Guide for Residents of New Hamburg
Download a copy of the brochure Preparing for Flooding: A Guide for Residents of Ayr

Critical flows

**Critical flows table:** This chart will help you understand the significance of various flows levels. The chart shows the name of the gauge, the affected communities and various flow levels along with the significance of that flow level. Flows are measured in cubic metres per second, i.e. the amount of water flowing past a spot in one second.
Gauge (Community)	Flow (m³/s)	Significance
Nithburg	0.2	Normal summer low flow
Nithburg	75	Water at banks; low-lying areas flooded
Phillipsburg	0.6	Normal summer low flow
Phillipsburg	108	Water at banks; low-lying areas flooded
New Hamburg	1.5	Normal summer low flow
	120	Water at banks
	142	Warning Zone 1; water on fairgrounds
	175	Warning Zone 2
	300	Warning Zone 3
	500	Warning Zone 4
Ayr	2.6	Normal summer low flow
	110	Water at banks; low-lying areas flooded
	142	Water on parking lots behind Northumberland St.
	up to 200	Warning Zone 1
	226	Water at rear doors behind Northumberland St.
	200 to 300	Warning Zone 2
	300 to 400	Warning Zone 3
	400 to 600	Warning Zone 4
	600 to 800	Warning Zone 5
Canning	2.9	Normal summer low flow
Canning	120	Water at banks; low-lying areas flooded

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