Editing Bay of Fundy (section)

== Hydrology ==
{{multiple image
| footer = [[Alma, New Brunswick]], at high and low tide
| width = 150
| image1 = Bay of Fundy High Tide.jpg
| image2 = Bay of Fundy Low Tide.jpg
}}
=== Tides ===
The [[tidal range]] in the Bay of Fundy is about {{convert|16|m}}; the average tidal range worldwide is only {{convert|1|m|ft|spell=in}}. Some tides are higher than others, depending on the position of the moon, the sun, and atmospheric conditions. Tides are ''semidiurnal'', meaning they have two highs and two lows each day, with about 6&nbsp;hours and 13&nbsp;minutes between each high and low tide.<ref name=explorenb>{{cite web |title=The Bay of Fundy is a 160&nbsp;billion tonne wonder; here's why |date=2018-05-02 |series=Tourism New Brunswick |publisher=[[Government of New Brunswick]] |type=blog |url=http://blog.tourismnewbrunswick.ca/the-bay-of-fundy-is-a-160-billion-tonne-wonder-heres-why |via=tourismnewbrunswick.ca |access-date=7 June 2019 }}</ref>

Because of [[tidal resonance]] in the funnel-shaped bay, the tides that flow through the channel are very powerful. In one half-day tidal cycle, about 100&nbsp;billion tonnes (110&nbsp;billion [[short ton]]s) of water flow in and out of the bay, which is twice as much as the combined total flow of all the rivers of the world over the same period.<ref>{{cite web |title=Why are the Bay of Fundy tides so high? |website=bayfundy.net |url=https://www.bayfundy.net/science/hightides.html |access-date=15 June 2019}}</ref> The [[Annapolis Royal Generating Station]], a 20&nbsp;[[Megawatt|MW]] [[tidal power]] station on the [[Annapolis River]] upstream of [[Annapolis Royal, Nova Scotia|Annapolis Royal]], was, until its shutdown in 2019,<ref>{{cite news |first=Paul |last=Withers |date=23 February 2021 |title=Nova Scotia Power to pull plug on tidal station; seeks $25M from ratepayers |department=Nova Scotia |website=cbc.ca/news |publisher=[[CBC News]] |url=https://www.cbc.ca/news/canada/nova-scotia/nova-scotia-power-annapolis-generating-station-1.5924509 |access-date=26 June 2023}}</ref> one of the few tidal generating stations in the world, and the only one in North America.<ref>{{cite web |title=Annapolis Tidal Station |website=nspower.ca |publisher=[[Nova Scotia Power]] |url=https://www.nspower.ca/en/home/about-us/how-we-make-electricity/renewable-electricity/annapolis-tidal-station.aspx |url-status=dead |access-date=1 July 2019 |archive-url=https://web.archive.org/web/20190701142750/https://www.nspower.ca/en/home/about-us/how-we-make-electricity/renewable-electricity/annapolis-tidal-station.aspx |archive-date=1 July 2019 |lang=en-CA }}</ref>

Most of the rivers that drain into the Bay of Fundy have a [[tidal bore]], a wave front of the incoming tide that "bores" its way up a river against its normal flow. Notable tidal bores include those on the [[Petitcodiac River|Petitcodiac]], [[Maccan River (Nova Scotia)|Maccan]], [[St. Croix River (Nova Scotia)|St.&nbsp;Croix]], and [[Kennetcook River|Kennetcook]] rivers.<ref name=bore>{{cite web |title=The tidal bore |website=bayoffundytourism.com |publisher=Bay of Fundy Tourism |url=http://bayoffundytourism.com/worlds-highest-tides/tidal-bore/ |access-date=15 June 2019 |lang=en-CA}}</ref> Before the construction of a [[causeway]] in 1968 and subsequent [[siltation]] of the river, the [[Petitcodiac River]] had one of the world's largest tidal bores, up to {{convert|2|m|ft|spell=in}} high. Since the opening of the causeway gates in 2010, the bore has been coming back, and in 2013 surfers rode it a record-breaking {{convert|29|km|abbr=}}.<ref>{{cite web |title=Surfers set record after 29&nbsp;km ride on Moncton tidal bore |date=25 July 2013 |department=New Brunswick |website=cbc.ca/news |publisher=[[CBC News]] |url=https://www.cbc.ca/news/canada/new-brunswick/surfers-set-record-after-29-km-ride-on-moncton-tidal-bore-1.1327888 |access-date=18 June 2019 |lang=en-CA}}</ref>

Other tidal phenomena include the [[Reversing Falls]] near the mouth of the [[Saint John River (Bay of Fundy)|St.&nbsp;John River]], a [[rip tide]] at [[Cape Enrage]], and the [[Old Sow whirlpool]] at [[Passamaquoddy Bay]].<ref name=bore/>