{{redirect|Harihari|the small South Island west coast settlement|Hari Hari}} {{Use New Zealand English|date=March 2024}} {{Infobox body of water | name = Lake Harihari | image = | caption = | image_bathymetry = | caption_bathymetry = | pushpin_map = New Zealand | pushpin_map_alt = Location of Lake Harihari | pushpin_map_caption = Lake Harihari is in the [[Waikato]] region of the North Island | location = [[Waitomo District]], [[Waikato]] region, [[North Island]] | coordinates = {{coord|38|12|35|S|174|43|23|E|region:NZ|display=inline,title}} | lake_type = [[Trophic state index#Oligotrophic|oligomesotrophic lake]] | inflow = | outflow = [[seepage]] | catchment = {{convert|134|ha|acre|abbr=on}} | basin_countries = [[New Zealand]] | length = | width = | area = {{convert|18.39|ha|acre|abbr=on}} | depth = | max-depth = {{convert|9|m|ft|abbr=on}} | volume = | residence_time = | shore = | elevation = {{convert|20|m|ft|abbr=on}} | islands = | cities = }} '''Lake Harihari''' is a [[dune]]-dammed lake 10 km south of [[Kawhia]] in the [[Waikato]] region of [[New Zealand]]. Its water quality is the best amongst the Waikato dune lakes. It is ranked eighth in importance in the region.<ref name="eco" /> Its quality has been attributed to its remoteness.<ref name=":0">{{Cite web|url=https://www.waikatoregion.govt.nz/assets/PageFiles/Zooplankton%20Monitoring%20for%20TLI%20and%20Lake%20Health%20Assessment%20of%20the%20Waikato%20Lakes%202015%202016.pdf|title=Zooplankton monitoring for TLI and lake health assessment of the Waikato lakes|last=Duggan|first=Ian C|date=July 2016|website=Waikato Regional Council}}</ref>
== Geology == The lake is dammed by the dunes, though in wet weather a stream flows from it.<ref name="eco" /> Under the dunes a hard strong [[Friability#Geological usage|friable]] [[greywacke]] sandstone forms most of the coastline from Albatross Point to [[Awakino]].<ref>{{cite web|url=http://www.waikatoregion.govt.nz/PageFiles/7823/tr0814.pdf |title=West Coast Hazard Project: Environment Waikato 2008 |format=PDF |date= |accessdate=2013-10-26}}</ref> It is part of the Late [[Triassic]] ([[New Zealand geologic time scale#Triassic Period|Oretian-Otapirian]]) rocks of the Newcastle Group.<ref>Geology of the Waikato Area: IGNS 2005 page 21</ref>
The lake bed belongs to [[Lake Taharoa|Taharoa Lakes]] Trust and the land around it is private. Waikato Biodiversity Forum said, "''We know of only one other shallow lake in the region that is comparable in terms of water quality''."<ref>{{Cite news|url=https://issuu.com/nzarm/docs/broadsheet_august2011_issue15_web|title=NZARM Broadsheet Newsletter Aug 2011|work=Issuu|access-date=2018-07-14|language=en}}</ref> It is ranked eighth in regional importance as a Category Two Lake – high condition, high vulnerability.<ref>Waikato Regional Policy Statement (November 2010)</ref>
== Biota ==
Lake Harihari has the best quality of all the Waikato dune lakes<ref name="niwa">{{cite web|url=https://www.waikatoregion.govt.nz/assets/PageFiles/5703/tr07-35.pdf|title=The condition of lakes in the Waikato Region using SPI|publisher=Waikato Regional Council}}</ref> with [[Trophic state index#Oligotrophic|oligomesotrophic]] water quality.<ref name="eco" /> Works such as a trial fish passage structure (installed in 2009), fencing a 37 to 80m buffer (started in 2005),<ref>{{cite web|url=http://www.waikatoregion.govt.nz/PageFiles/19603/Presentation%20to%20West%20Coast%20Catchment%20Liaison%20Subcommittee%206%20August%202013.pdf |title=2013 WRC update with map and photos |format=PDF |date= |accessdate=2013-10-26}}</ref> and about 10,000<ref>{{cite web|url=http://waikatoregion.govt.nz/PageFiles/19541/Agenda%20Package%20-%2015%20August%202013.pdf |title=Regional Pest Management Committee Aug 2013 with before and after photos |format=PDF |date= |accessdate=2013-10-26}}</ref><ref>{{Cite web|url=https://www.waikatoregion.govt.nz/assets/Uploads/Agenda-pack-WCC-21-May-2018.pdf|title=West Coast Catchments Committee Open Agenda|date=21 May 2018|website=Waikato Regional Council}}</ref> new plants, selected to withstand the harsh coastal winds and dry summers,<ref>{{cite web|title=Waikato BioForum Newsletter August 2011 Number 32|url=http://waikatobiodiversity.org.nz/newsletters/newsletter_number_32_august_2011/|publisher=Waikato Biodiversity Forum}}</ref> aim to improve the lake's [[Ecosystem services#Economics|value]].<ref name="eco">{{cite web|url=https://www.waikatoregion.govt.nz/assets/PageFiles/19300/2011-05.pdf|title=Significant Natural Areas of the Waikato Region – Lake Ecosystems|date=2011|publisher=Waikato Regional Council}}</ref> Biota recorded include [[New Zealand grebe|dabchicks]],<ref name="eco" /> shells, a large [[Freshwater bivalve|freshwater mussel]] population,<ref name="eco" /> freshwater [[sponge]]s (common), native snails,<ref name="eco" /> native fish, the [[common bully]] and [[New Zealand smelt]].<ref name="eco" />
The health of the lake is indicated by the variety of [[zooplankton]] in it - [[rotifer]]s (''Anuraeopsis fissa'', ''Synchaeta grandis'', ''S. longipes'', ''Ascomorpha ovalis'', ''[[Brachionus]] angularis'', ''B. caliciflorus'', ''[[Keratella cochlearis]]'', ''K. tecta'', ''[[Polyarthra (rotifer)|Polyarthra]] dolichoptera'', ''Trichocerca similis''), ''[[Bosmina meridionalis]]'', ''[[Calamoecia lucasi]]'', ''[[Mesocyclops leuckarti]]'', [[Crustacean larvae#Nauplius|nauplii]].<ref>{{cite web|url=http://researchcommons.waikato.ac.nz/bitstream/handle/10289/7014/Duggan%20Assessment%20of%20the%20water%202007.pdf?sequence=1 |title=An Assessment of the Water Quality of Ten Waikato Lakes Based on Zooplankton Community Composition 2007 |date= |accessdate=2013-10-26}}</ref> Harihari has the lowest non-native zooplankton of all Waikato lakes,<ref name=":0" /> though alligator weed control was carried out in 2018.<ref>{{Cite web|url=https://www.waikatoregion.govt.nz/services/regional-services/plant-and-animal-pests/pest-plant-control-over-water/|title=Pest plant control over water operations under Resource Consent 124871|website=Waikato Regional Council|language=en-NZ|access-date=2018-07-14}}</ref> There are also other weed species such as [[willow]], [[Cortaderia selloana|pampas]], [[Pennisetum clandestinum|kikuyu]]<ref name="eco" /> and [[Elodea canadensis|Canadian pondweed]].<ref name="niwa" />
== History ==
The archaeology map shows a dozen sites around and near the lake.<ref>{{cite web|url=https://archsite.eaglegis.co.nz/NZAAPublic|title=archaeology map|publisher=Nzaa.eaglegis.co.nz|access-date=2018-07-14|archive-date=2019-12-19|archive-url=https://web.archive.org/web/20191219221127/https://archsite.eaglegis.co.nz/NZAAPublic|url-status=dead}}</ref>
== See also == * [[List of lakes in New Zealand]]
== References == {{Reflist}}
== External links == *[http://www.niwa.co.nz/sites/default/files/import/attachments/3._The_state_of_Waikato_shallow_lakes_Neilson.pdf NIWA Shallow Lakes report with photo of Lake Harihari] *[http://www.nztopomaps.com/25571/Lake-Harihari/Waikato 1:50,000 map]
{{Waitomo District}}
[[Category:Waitomo District]] [[Category:Lakes of Waikato|Harihari]]