词条 | Lake Ivanhoe (New Hampshire) |
释义 |
| name = Lake Ivanhoe | other_name = Round Pond | image = | caption = | image_bathymetry = | caption_bathymetry = | location = Carroll County, New Hampshire | coords = {{coord|43|36|7|N|70|59|25|W|type:waterbody_region:US|display=inline, title}} | type = Oligotrophic | inflow = | outflow = Overland to Great East Lake | catchment = {{convert|455|acre}} | basin_countries = United States | length = {{convert|3371|ft}}[1] | width = {{convert|1851|ft}}[2] | area = {{convert|68|acre}} | depth = {{convert|12|ft}} Average transparency: {{convert|4.7|m}} | max-depth = {{convert|20|ft}} | volume = {{convert|992,000|m3}} | residence_time = 1.1 years | shore = {{convert|8,858|ft}} | elevation = {{convert|571|ft}} | islands = | cities = Wakefield[3] }} Lake Ivanhoe (also known as Round Pond) is located in Carroll County, New Hampshire, in the United States. The lake has no traditional inlets or outlets. Historically, a small stream drained Lake Ivanhoe to Great East Lake, but construction filled in that stream many years ago and now drainage flows over land to Great East Lake. Lake Ivanhoe is classified as "Potentially Impaired" according to the New Hampshire Department of Environmental Services water quality parameters. Lake Ivanhoe receives this designation due to its in-lake phosphorus concentration which exceeds the water quality standards for oligotrophic lakes. The Lake Ivanhoe watershed is {{convert|455|acre}} and is 64% forested. The watershed is currently 17%, developed with 59% of the watershed being buildable area. The Lake Ivanhoe shoreline is primarily composed of low density residential houses and camps (66%). The majority of these structures (88%) are within 50 feet of the water's edge. Lake Ivanhoe water quality monitoring has been collected since 1981. During this period, 16 years of secchi disk transparency data, 17 years of total phosphorus (TP) data, 16 years of chlorophyll-a (Chl-a) data, and 14 years of dissolved oxygen (DO) data have been collected. From this data, the median TP concentration is 8.0 parts per billion (ppb) and the mean transparency is {{convert|4.7|m}}.[4] See also
References1. ^ESRI ArcGIS 2. ^ESRI ArcGIS 3. ^{{cite web|url=http://www.fbenvironmental.com/images/PDF/SalmonFallsHeadwatersWBMP.pdf |title=Archived copy |accessdate=2011-12-14 |deadurl=yes |archiveurl=https://web.archive.org/web/20120426051426/http://www.fbenvironmental.com/images/PDF/SalmonFallsHeadwatersWBMP.pdf |archivedate=2012-04-26 |df= }} 4. ^{{cite web|url=http://www.fbenvironmental.com/images/PDF/SalmonFallsHeadwatersWBMP.pdf |title=Archived copy |accessdate=2011-12-14 |deadurl=yes |archiveurl=https://web.archive.org/web/20120426051426/http://www.fbenvironmental.com/images/PDF/SalmonFallsHeadwatersWBMP.pdf |archivedate=2012-04-26 |df= }} 2 : Lakes of Carroll County, New Hampshire|Lakes of New Hampshire |
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