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Category IV -Nutrient Traps No numeric standards for water quality parameters are defined for this category. Water bodies in this category are intended to reduce downstream loading of phosphorus and other nutrients that contribute to water pollution. These ponds are generally artificially modified to improve their nutrient trapping capacity. These ponds may become hypereutrophic, and frequent summer algal blooms would be considered normal. These ponds are designed to have phosphorus removal efficiencies of at least ~0% and the depth of these ponds should be managed to prevent or reduce odors associated with algal blooms. Category V -Sediment Traps These water bodies are similar to category IV water bodies, but are too small to effectively remove a significant fraction of nutrients. These basins will generally have phosphorus removal efficiencies of 50%. A~lar~l~ l~~aiet• bo~/re,,~ ia~ill trot be ~rrai~cr~d by tla~ C~Lr1,1-~0, el~ef~ th~~t~gh theymrr~~ heclnt~s~i~rec~n accorda~~ce tivitl~ these GL i~MO categories. The GI_WMO Board will deslgt~ate those ~raler bodies tivrth tii~hich the UL1~rMU titi-ill be directly irwolved. Othef•.;~ tii~ill be mai~a~c~d big the cotes to achieve both the I~%l~> '.t~ goals and the cities 'goals. V11M0-IVlanaged Water Bodies anc!'Application ®f Gtassifacati®n system WMO-managed water bodies are those waters determined b~~ the GLWNIO Board to have broad watershed significance; they are important to a`larger population rxar~ than just the municipalities in which they are located. The WMO will c(assify~ WMO-managed water bodies ~~°~" "° °'°°~~~°~' °°~d i~n.~ ~o based oil their existing water quality, takinginto accounttheir use, and/or the presence of ecologically or biologically unique resources, according to irs-i-n~g the proposed classification system. This preliminary classificationmav be revised, based on existing and desired usesofthe ~~daterbodie;s and thG projUCted future eater duality of the water- bodies: ~Fh~~~ill~~eall°~' +r,° `'°,,:~+;,,,. ^~^~~~~^^+~^~ " The WMO will set manage»tentclassification based on ~~heth~r T~° ~xraan ..,;n +r.,,~ °°~' +° a°*°~~~~° ~~the water bodies should be managed to maintain or improve their water quality.- « >, Table 1 illustrates the implications of WMO management of water bodies and the respective rolesof the Wlvl® and the cities in «-titer quality tasks, Grass_lake_class_system Page 4 10/22/99