Water regime is therefore taken as a basis for river classification. LAKE CLASSIFICATION APPROACH . broad units of government to strive to manage all lakes individually. For. Buffalo River . Fish. International Journal of Salt Lake Research 5: 35-44, 1996. E�C�IN�V��+���w7��U�Z�W�_X�V]xe �����M����:sS?�(���Ȟ�N�hQj/n�q����d�މ�d\���1+ǁ�� ���3 Chapter 4 Revised classification system and lake key 14 Chapter 5 Individual descriptions of the lake groups 21 Group A Small, predominantly northern dystrophic peat or heathland pools, dominated by Sphagnum spp. Printed in the Netherlands. Sorry, preview is currently unavailable. Keywords: classification of lakes, hydrography, Water law, Polish law. As a results, very shallow lakes are excluded this classification system. CLASSIFICATION OF LAKE TYPES IN NORTHERN IRELAND 45 Table 1. ����N�a?�0���5|#r�%�w=>=F��Ԏ��[�Ki 10 0 obj << /Linearized 1 /O 12 /H [ 840 236 ] /L 1255807 /E 1235202 /N 2 /T 1255489 >> endobj xref 10 22 0000000016 00000 n Lake Victoria is a large lake (68,800 km2) second only to Lake Superior in the world; has a long shoreline of 3450 km; a large catchment area of 193,000 km2., a mean depth of 40 m and maximum depth of 80 m. The lake is shared by Kenya (6%), Uganda (43%) and Tanzania (51%). That classification has been followed by many biologists in recent years and is especially useful in categorizing in a general manner the wetlands throughout the country over a span of years. LAKE CLASSIFICATION APPROACH . 0000031238 00000 n Lake Classifications Shoreland classifications include public water basins (lakes) down to 25 acres in size in unincorporated areas and ten acres in size in incorporated areas that have DNR-approved shoreland ordinances. 1. Organic lakes are formed by the action of flora or fauna. Serv., North. 0000061684 00000 n 0001224310 00000 n A DRAFT CLASSIFICATION OF NATURAL FRESHWATER LAKES AND PONDS IN NEW HAMPSHIRE December 30, 2015 3 ACKNOWLEDGEMENTS We thank the following biologists who provided comments on the classification framework for lake and pond systems in NH: Matt Carpenter, Sandy Crystall, Joann Hoy, Sara Steiner, and Barry Wicklow. 0000061733 00000 n Lake – Classification of Lakes Lakes are among the most varied features of the earth’s surface. However, in the context of lake use and assessments such a classification is of little value. Many big rivers fall into the Black Sea, making the salinity of its surface water half that of the ocean: 17‰. ABSTRACT The Lake Louise Study Area comprises about 107 km2 (41 mi2) in the vicinity of Lake Louise, Alberta, Canada. H�\Vt�W��>�o�ѐx67n���xF* �H%K��\�� A lake’s ability to support plant and animal life defines its level of productivity, or trophic state. 1, 400084 Cluj - Napoca, Romania Note 2: Caspian Sea and Dead Sea are lakes. Pedol. !FhX�3�(�ī��NK��!̴RաԲT�R:C�R�ʒ�ٹ�5�����}���?�����\��X��1c{F���X8��ٗs Maple Grove, MN 55369 . By using our site, you agree to our collection of information through the use of cookies. 0000064433 00000 n %PDF-1.2 %���� A lake is a large body of natural water accumulated in a depression. Buffalo River Watershed Lake Classification Approach . October 31, 2011 . implementation of the WFD. Data on submerged macro-phytes were only available from 1993 to 2002. In the fields of geology, physics and chemistry the classification is commonly based on the salinity of lake waters, hydrochemical types, saline mineral associations, mode of occurrence of lakes, relation and volume ratio of solid phase to liquid phase, origin of lake basins and useful minerals within the saline lakes (Jones et al., 1965; Eugster et ai., 1978). INTRODUCTION . 0000000840 00000 n These contribute to domestic and industrial water supplies, agricultural practices and fisheries, as well as supporting natural biota. An ecosystem is a self-contained unit of living things and their non-living environment. 0000001055 00000 n The Lake basin is estimated to have a population of 30 m people which is 0000001456 00000 n October 31, 2011 . Low productive oligotrophic lakes are generally deep and clear with little aquatic plant growth. Watershed . �1p5(L�0 �1= endstream endobj 31 0 obj 131 endobj 12 0 obj << /Type /Page /Parent 9 0 R /Resources 13 0 R /Contents 25 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 13 0 obj << /ProcSet [ /PDF /Text /ImageC /ImageI ] /Font << /TT1 19 0 R /TT2 15 0 R /TT3 24 0 R >> /XObject << /Im1 28 0 R /Im2 29 0 R >> /ExtGState << /GS1 26 0 R >> /ColorSpace << /Cs5 22 0 R /Cs9 21 0 R >> >> endobj 14 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 70 /FontBBox [ -498 -307 1120 1023 ] /FontName /DEAKCM+TimesNewRoman,Italic /ItalicAngle -15 /StemV 0 /FontFile2 16 0 R >> endobj 15 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 116 /Widths [ 250 0 0 500 0 0 0 0 333 333 0 0 0 0 0 0 0 500 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 667 0 0 0 0 0 0 0 0 556 833 0 0 0 0 0 500 0 0 0 0 0 0 0 0 0 0 0 0 0 500 0 444 500 444 278 500 500 278 0 444 278 722 500 500 0 0 389 389 278 ] /BaseFont /DEAKCM+TimesNewRoman,Italic /FontDescriptor 14 0 R >> endobj 16 0 obj << /Filter /FlateDecode /Length 14891 /Length1 25180 >> stream Organic lakes . Different fish species respond differently to water quality and habitat changes within a lake environment. The wetland classification system for the United States adopted by the Bureau of Sport Fisheries and Wildlife in 1953 is described by Martin et al (1953) and by Shaw and Fredine (1956). This classification should be viewed as a first step in a process of refinement so that, eventually, lakes within Lake Classification and Local Ordinance Development Grants NR 191.30, Wis. Admin. 0000031025 00000 n Classification of Lakes Temporary lakes. trailer << /Size 32 /Info 8 0 R /Root 11 0 R /Prev 1255479 /ID[] >> startxref 0 %%EOF 11 0 obj << /Type /Catalog /Pages 9 0 R >> endobj 30 0 obj << /S 78 /Filter /FlateDecode /Length 31 0 R >> stream Due to the absence of intermixing of the water, the bottom layer of the lake contains no dissolved oxygen and is therefore largely devoid of life except for the purple sulfur bacteria. As such, the water levels will be influenced by the climatic Classification of rivers, especially large ones, according to their hydrological features, is rather difficult. About 280 000 cu.km of water exists on earth in the form of lakes. Download Full PDF Package. 7.2.2 Classification of lakes As noted in the brief discussion above the first level of classification of lakes is defined by their origin. Canada, Finland and Siberia contain most of the fresh water lakes. Homogeneity of the lake types is given by the mean values* for indices (1 or 0) allocated to categories of each descriptor. lake classification system for Wisconsin lakes (i.e., one that allows lakes to change classes over time) for use in conser-vation management of inland Wisconsin fisheries. 0000017047 00000 n As a results, very shallow lakes are excluded this classification system. Meromictic Lakes. A lake (from the Latin word lacus) is an inland body of water, not part of the ocean, that is larger and deeper than a pond and is localized at the bottom of a basin. M-76-9. In total, 5,950 lakes were classified into 15 lake classes using a two-tiered approach. The majority of the lakes in the world are holomictic. The stratification in a lake is not always the result of variation to density because of thermal gradients. about lake classification CLASSIFYING LAKES FOR BETTER MANAGEMENT Why are lakes classified into different categories? To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. The stratification in a lake is not always the result of variation to density because of thermal gradients. Classification of lakes Lakes are classified on the basis of their water chem-istry. Lake, any relatively large body of slowly moving or standing water that occupies an inland basin of appreciable size. The majority of lakes on Earth are fresh water, and most lie in the Northern Hemisphere at higher latitudes. Shoreland classifications include public water basins (lakes) down to 25 acres in size in unincorporated areas and ten acres in size in incorporated areas that have DNR-approved shoreland ordinances. On the basis of their nutrient content. H�b```a``�``e`�:� ʀ �@V �(`��=(p&���9�2���h �@�� �� H�M C ������� � ��ps �H#;� �,#��g���5z�3� Intercalibration of the national classifications of ecological status for Central-Baltic Lakes Biological Quality Element: Fish fauna Part B and C . �9,;>'u�>TLٗ[�^ĕ��*S��_�w:A�ҟI��� It can even play a role in determining the types of birds and wildlife that are attracted to a waterbody. Clearly, the classification of lakes in the WFD must eventually be based on biological indicators, but TP is the main environmental stressor and the primary determining factor for numerous bio-logical variables, and it is also used in present-day lake classification (Vollenweider & Kerekes 1982; Wetzel 2001). The purpose in classifying the lakes was to (1) evaluate actual water-quality and eutrophic conditions, (2) estimate the percentage nutrient contribution from various sources of eutrophication, and (3) evaluate potential nutrient-enrichment sources. Original article Study Regarding Hydrochemical Classification of the main Lakes from Fize ş Watershed (Romania) Tania MIHAIESCU 1*, R. MIHAIESCU 2, E. MUNTEAN 1, Nicoleta MUNTEAN 1 1University of Agricultural Sciences and Veterinary Medicine Cluj - Napoca,Manastur St.,No. Low productive oligotrophic lakes are generally deep and clear with little aquatic plant growth. 0000001076 00000 n 15 The simplest classification is the dimension of a lake. because, as many lake residents already know, changes in water levels can influence the water quality of their lake including the amount of algae and/or aquatic plants growing in the water, fish species and abun-dance, and water clarity. For example, lakes can be classified to apply varying shoreland development standards. Classification of the lakes The purpose of the classification was to create lake cluster classifications according to the principle that each cluster was to have a fish species composition of its own particular type, so that each composition was to differ from all the others. to structure a classification system for lakes in Washington. Holomictic lakes exist in three distinct types, and they include monomictic lakes, dimictic lakes, and polymictic lakes. Watershed . Land classification of Lake Louise Study Area, Banff National Park. Republicii, No. The majority (383 or 85.3%) of the lakes examined in the period 2004-2006 were of satisfactory water quality, i.e. County Lake ID: City Name Basin Name: Alternative Name DNR Classification: County Classification City Classification: Aitkin 01020900 Cedar: Recreational Development Recreational Development: Aitkin 01014500 Chamberlin: Chamberline Natural Environment: Natural Environment Aitkin 01016400: Christmas Christman: A DRAFT CLASSIFICATION OF NATURAL FRESHWATER LAKES AND PONDS IN NEW HAMPSHIRE December 30, 2015 3 ACKNOWLEDGEMENTS We thank the following biologists who provided comments on the classification framework for lake and pond systems in NH: Matt Carpenter, Sandy Crystall, Joann Hoy, Sara Steiner, and Barry Wicklow. Publ. high usefulness of maps for the classification of lakes, field observations are recommended to verify the conclusions formed on the grounds of desk studies. Classification of fish species in Minnesota lakes for use in fish-based index of biological integrity. The classification of lakes by thermal stratification presupposes lakes with sufficient depth to form a hypolimnion. Lake, any relatively large body of slowly moving or standing water that occupies an inland basin of appreciable size. Aeolian lakes. 0000002065 00000 n Lake Shoreland Classifications List by County PDF While the number of lakes is constant, the demand for use of these lakes has increased dramatically. These lakes are relatively small in size and quite rare in occurrence. 0000062660 00000 n Food-web structure and mercury dynamics in a large subarctic lake following multiple species introductions. A lake is a large body of natural water accumulated in a depression. 2. In general, very few definitive tests of alternative classification schemes for wetlands are available with respect to describ-ing reference condition for either nutrient criteria or biocriteria. This is the " period of spring circulation," or the " spring overturning." Inf. }?At �S|�˨ư�#:)/�� ��v䪹d�b�ɨ�e��T$=2z+� %OːEw�{���R06�b��&��(�O��I�e'���4T���o�A��f yq�ԑExu�w�a�'ˍ�Ɖ����{�. 0000061913 00000 n Lakes are classified on the basis of a) Origin b) Trophic levels c) Mixing of water. a flexible lake classification framework in collaboration with ~100 fisheries biologists for improved fisheries conservation man- agement in Wisconsin, USA. Cent. All types of liquid surface waters are considered—rivers, reservoirs, lakes, bogs. classification of the lakes by number and surface area. was made in 1979 to sample lakes throughout the state and compile the results. 3 - 5, Cluj - Napoca, Romania 2Babes-Bolyai University, Kogălniceanu St.,No. Lake basins are formed due to endogenous geological processes like tectonism and volcanism and exogenous activities like landslides, glaciation, solution, river and wind action. Whether a lake is small, big or very large. Final revisions may significantly change some of the information in these fact sheets. I - Classification of Water Quality Standards - Yasumoto Magara ... Ambient water bodies are categorized into three types: rivers, lakes, and coastal waters. �Q-��R�L[h��(��):O������BO�)?��ܓc9���N���"~�7�6����\�|�/�Mv�N��$����&ID�%j�:��VT����Jl�Q�a7B�F��̸nv�8M5�wD�Y|,�*�~�i�m���͚lM�~`�g�R)UX/U��G����+�R�g|�ޤ3�ϸǾ�E8ʈ�����P�S%�Q��u�`%1���!�O�K�f�獶����~sV�3JlV�Bu=Z� =5(���H-,�QT'5�ϳ�{�Q� Co��›[R�1Ta9��!l�w����k�O6� آVJ�����Sz8=R���+���/�A��c8��. Res. 7.2.2 Classification of lakes As noted in the brief discussion above the first level of classification of lakes is defined by their origin. They are usually found in low lying areas and are fed from streams, rivers and runoff from the surrounding area. Lake Classification Fact Sheet Series For years NR 115 (the rule that governs shoreline zoning) has been going through a public process for revision. of classification schemes for wetlands, lakes, and riverine systems to promote cost-effective sampling and ease of interpretation. Lakes are classified into various types based on their origin or mode of formation. �H�%�������=�5��I|��Y"Y@�TM5���^�`4����]7�G��H��#��e&�J�����gxF�?-�����F��o�^�g���P*�:i�m���uK���poգ�;�v��&Nb�+\�#�xK��pT�=A���_� ���N%����Z�]�d.�Y\�HuVv�U�4��J�q�\`����Y��y�-l(�3EONY R.q���%['��w�͏� ���ه�R0u�$�q��L�DrR)�G�t����.��7�{��f�7�6�_�WnC�>f��(3K��4Y�YʬC�S�;��l process. You can download the paper by clicking the button above. Lake Classification. Within the global hydrologic cycle, freshwater lakes constitute only about 0.009 percent of all free water, which amounts to less than 0.4 percent of all continental fresh water. 0000065368 00000 n WHAT IS LAKE CLASSIFICATION? CLASSIFICATION OF PRECAMBRIAN SHIELD LAKES BASED ON FACTORS CONTROLLING BIOLOGICAL ACTIVITY By NELS CONROY, B.Sc.A. The basic terms used to describe these water bodies are defined. (763) 493-4522 . Lake basins are formed due to endogenous geological processes like tectonism and volcanism and exogenous activities like landslides, glaciation, solution, river and wind action. To learn more, view our, Food consumption and prey orientation of piscivorous brown trout (Salmo trutta) and pikeperch (Stizostedion lucioperca) in a large regulated lake, Fish and fisheries in large regulated peaking-power river reservoirs in northern Finland, with special reference to the efficiency of brown trout and rainbow trout stocking, Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes. There is, however, a lack of consensus on definitions used to distinguish between lakes and ponds. This report addresses the classification / grouping of lakes in the Buffalo River … The scientific output expressed does not imply a policy position of the European Commission. Materials and methods 2. INTRODUCTION . I. Such lakes … Can., Can. lakes, reservoirs, bogs) or solid (glaciers, snow cover) condition but this article does not attempt to cover the latter. o:�t�������=��'��t���_�;�N�WW�:O�*�ng�M�+zH��hL��1[8� The results of 273 sediment samples collected from 63 Illinois lakes were compiled and reported by Kelly and Hite in 1981. Survey of the lakes in the study area was carried out over a period of 6 months, from September 2009 till February 2010. 0000062125 00000 n Some people have even learned to foresee changes in their lake and use them to enhance their own personal management goals. Here is a description of these different types of lakes: 11. Lake residents can use their knowledge of lake morphometry when deciding where to build a lakefront home, boathouse, or dock. The wetland classification system for the United States adopted by the Bureau of Sport Fisheries and Wildlife in 1953 is described by Martin et al (1953) and by Shaw and Fredine (1956). Impacts of climate warming on long-term dynamics of key fish species in 24 European Lakes24 European long-term data series. Holomictic lakes have with uniform density and temperature regardless of depth in a particular period of the year. Salt LakesSalt Lake is an inland … River types are determined … The ecological classification of UK lakes using aquatic macrophytes Ref: LIT 7377 PDF , 5.34MB , 235 pages This file may not be suitable for users of assistive technology. Academia.edu no longer supports Internet Explorer. Classification of Tibetan lakes based on variations in seasonal lake water temperature | SpringerLink Based on the levels of salinity, they are known as freshwater, brackish or saline lakes. Stratigraphic classification of ancient lakes: Balancing tectonic and climatic controls Alan R.Carroll Department of Geological and Geophysical Sciences, University of Wisconsin, 1215 West Dayton Street, Madison, Wisconsin 53706, USA Kevin M.Bohacs Exxon Production Research Company, P.O. Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. Section 5: Lake and River Classifications. The numbers of lakes and the arithmetic mean values for altitude, area and alkalinity. That classification has been followed by many biologists in recent years and is especially useful in categorizing in a general manner the wetlands throughout the country over a span of years. Keywords: classification of lakes, hydrography, Water law, Polish law. (~) 1996 Kluwer Academic Publishers. Lake – Classification of Lakes Lakes are among the most varied features of the earth’s surface. Code Overview: Lake Classification projects will be conducted by counties to study the characteristics of lakes and assign them into different management classifications for the purpose of implementing lakes-based protection activities. Lake Lonar in Aurangabad). Houston Engineering Inc. 6901 E. Fish Lake Road, Suite 140 . However, in the context of lake use and assessments such a classification is of little value. The classification of lakes by thermal stratification presupposes lakes with sufficient depth to form a hypolimnion. TITLE: Classification of Precambrian Shield Lakes Based on Factors Controlling Biological Activity AUTHOR: Nels Conroy, B.Sc.A. the more intensive lake studies, yielded information necessary to structure a classification system for lakes in Washington. 1. There are several type, kinds and categories of lakes in the world. 0000001229 00000 n Lakes are commonly classified based on their productivity. For many years lakes have been subject to civil law provided they were classified as stagnant waters. Lake - Lake - Uses and abuses of lakes: In today’s industrial societies, requirements for water—much of which is derived from lakes—include its use for dilution and removal of municipal and industrial wastes, for cooling purposes, for irrigation, for power generation, and for local recreation and aesthetic displays. lakes created by beaver dams to lakes in depressions created by meteorite impact. For. Soon the surface and bottom layers come to have substantially the same temperature, and vertical currents extend from top to bottom. It lasts several weeks, but varies in duration in different years. 0000000786 00000 n 1. Minnesota's lakes range from the sterile, rock basin lakes of the Arrowhead region to the naturally fertile, shallow lakes of the southwest prairie region. Great Lakes of North America, Lake Baikal in Russia, Lake Wular and Loktak Lake in India. Lakes are classified in many different ways to help identify similarities and differences, to assess ecosystem health, and to help establish policies and regulations. For many years lakes have been subject to civil law provided they were classified as stagnant waters. oligotrophic or mesotrophic in status (Figure 3.1). The following chart shows the types of Natural Ecosystem − Lake Classification and Local Ordinance Development Grants NR 191.30, Wis. Admin. Meromictic lakes have layers of water that do not intermix. Houston Engineering Inc. 6901 E. Fish Lake Road, Suite 140 . (fact sheet #1 of the Shoreland Management and Lake Classification Series) BACKGROUND Wisconsin is home to 15,000 lakes of varying types: from massive flowages to small town millponds, from highly developed urban lakes to undeveloped fiwildernessfl lakes. A lake’s ability to support plant and animal life defines its level of productivity, or trophic state. Lakes produced as a result of the action of winds are called aeolian lakes. They are termed endorheic lakes. Enter the email address you signed up with and we'll email you a reset link. No. Environ. Lake Shoreland Classifications List by County; Natural Environment Lakes. e.g. Enzymological classification of salt lakes in Romania VASILE M U N T E A N 1, RADU CRISAN 1, DANIELA PA~CA 1, STEFAN K I S S 2 and MIHAIL DRAGAN-BULARDA 2 l lnstitute of Biological Research, Str. 0000064511 00000 n Note 1: Black Sea is not a lake since Bosporus and Dardanelles Straits connect it to the Mediterranean Sea. Maple Grove, MN 55369 Buffalo River . Kelly and Hite proposed a classification of Illinois lake sediments that was based on the statistical properties of the 1979 data. 1 | P a g e . The purpose in classifying the lakes was to (1) evaluate actual water-quality and eutrophic conditions, (2) estimate the percentage nutrient contribution from various sources of Trophic State Classification of Lakes with Aquatic Macrophytes' DANIEL E. CANFIELD, JR., KENNETH A. LANGELAND, M~CMAEL J. MACEENA, WIL~LIAM 'F. Rivers vary from the urbanized Mississippi in the Twin Cities to remote streams trickling into Lake Superior. it provides an opportunity to evaluate the classification of lakes relative to TP, which in turn might help the implementation of the WFD. For example, some are sensitive to poor water quality while others thrive in those conditions. Their types and classifications are given, and data are presented on the largest rivers, lakes and reservoirs. INTRODUCTION . Lake Classifications. Rep. NOR-X-160 and Alberta Inst. The ecological classification of UK lakes using aquatic macrophytes. The water quality of the remaining 66 lakes was less than satisfactory. %E^{i��9 ���������g�:m/�5�X�,+���k+�cn��9�L:�w��FP�F����l�� yo7�ќ�۩�Uq�{��_�P���A)�" ��+Na:���*����0��UtG@�X�A�>%+��;|�-X�G�����?`�V��×���o֣/�c��'�F�G����Hƻ��A4V-6�0��)�©-D�`(�Ǩc��j�)x�D>$g�HE]P rR&��E��{`Ta��Kԗ#���p�` ���؀͸D=h��mF����a� �BG�[I�DA�؍�8MA��=U����6|1K���i��~}\v��9�)�K�I�ۉ��ç�z�L�����ft��9�u���`'f�5�In��1\�����t�{��k�mj��@O�$�*� 0000001678 00000 n d) Nature of Inflow-outflow. Lakes are commonly classified based on their productivity. A Thesis Submitted to the School of … The variety of geographical and climatic conditions is very wide. 27 slightly. (University of Guelph) SUPERVISOR: Professor J. R. Kramer NUMBER OF PAGES: vii, 142 ii . 37 Full PDFs related to this paper. Freshwater lakesMost of the lakes in the world are freshwater lakes. Ph. This paper. Important Lakes on Earth. Lake Classification. Document number wq-iw5-06o. Lakes formed in the craters developed due to the impact of meteorites (e.g. CLASSIFICATION OF LAKES. Classification suggests that it makes sense to place lakes into categories with management strategies best suited to the types of lakes found in each category. Within the global hydrologic cycle, freshwater lakes constitute only about 0.009 percent of all free water, which amounts to less than 0.4 percent of all continental fresh water. 1. 0000031550 00000 n The second classification of lakes based on thermal stratification is meromictic. HALLEK, AND JEROME V .SHIREMAN Cerlterfor Aquatic- Weeds, University qf Florida, Gainesvi[le, FL 3266 1 USA AND %OHN R. JONES Scr'zool of Fcsresfq', Fisheries, crnd Wildlife, Universiqi of la/Pissouri, Columhis~, M8 652 16, USA Lakes are most often classified based on 9 m). lakes (e.g., Bangs Lake) to a group of large, centrally located, moderately deep lakes with relatively small littoral zones (e.g., Lake Sangchris). A short summary of this paper . One of the main reasons for the desire to own lakes is the economic aspect related to, among others, the possibility to run fish farms. Code Overview: Lake Classification projects will be conducted by counties to study the characteristics of lakes and assign them into different management classifications for the purpose of implementing lakes-based protection activities. PDF | Lakes occupy about 1.8 % of the earth’s surface.