2002-03-13 CC Packet - Laserfiche WebLink

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MAR-[l4-2002 11 : 40 V)I y.j~ <o;U~ . ~~~ tlF' ~ ~,~."I ~ ""'''m''''= ~Q- ~:JY Peltier Lake is a bypereutropbic lake located In the headwater reaion of Rille Creek. This lake bas two different distinct water quality areas, The area to the south of the islanci is largely shallow water (tnellI1 depth 7 feet) with very few rooted aq\.l8tic macrophytes. This portion of the lake is very hiib in DJJtrients and experIcnce3 excessive growth of phytopbmkton (aIiae). The growth of algae limits light penetration into the water column, therefore Hmrtil1g the avallab1e habitat for rooted macrophyte growth. Large algal growths can also contribute to low periods of dissolved oxy&Cll. during low Iigbt condltions. This is caused by plant respiration or deeomposition of the: alia! material RICE CREEK WTRSHED 651 766 4196 P.02,03 March I, 2002 The area north of the island bas a diffi:rent water quality characteristic. This area of the lake ill generally 3 to 5 feet deep and bas extensive rooted aquatil: macrophyte coverage (mainly cooDlail). The density of rooted macrophytes helps consolidate the lake bonom sediments and also consumes available hutrients, therefore leaving less available nutrients for algal uptake. The water clarity in the northern pornoll of Peltier Lake is generally much cle= t:blIn In the southern portion. During !lll.lch of the growing season (May through September) the rooted macrophytC$ wculd consume nulrients from bolh the water column and also have SOIl!l: nutrient uptake through the root systems. Removal of aquatic mac:ropbytcs would have some impact on the water quality of the north basin. Some possible iIlJpacts would be redistribution of bottom llCtliments, and introduction of additioDlll nutrients to the water column. Without adequate phurt material to bulfer wave action caused by boating and wind. bottom sediments would suspend and be transported either into the south basin or into the water cohmm of the north basin. This action could increase the DIltriellt load to the water colu:rnn, decrease water clarity, cause stress on rcsidellt fish populatlollB, and potential1y give algae the competitive edge to expacd their range ml have even more severe blooms. Rooted aquatic J1IlIl:1'Opbytes benefit the water quality of lakes. There is evidence 1hat healthy aquatic macrophytes do not excrete large quantities of nutrients into the water column during active growiDg periods (Barko and Smart, 1980). 'Ihily do tend to concentrate sediment-supplied nutrients in their tissue. These nutrients arc partWly .....