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- PIM PIER Np Ll NRE RR 7 RA LR IRN Lk. Scugog weeds (From page 1) there will be a reduction in water levels due to evaporation regardless of how the dam is operated. Operation of the dam can benefit water levels primarily by increasing storage at the beginning of the summer season so the effects of evaporation won't be so noticeable. By operation of the dam at Lindsay, Parks Canada tries to counter summer evaporation loss. The lake is filled in the spring four inches higher than the summer navigation level. This provides a buffer for evaporation. Parks Canada also leaves all of the stoplogs in place during the sum- mer, except when a heavy rainfall nec- essitates a release of water. The lock at Lind- say is operated to minimize water loss from the passage of boats. As far as water depth is concerned, experts point out Lake Scugog is shallower than it used to be, and yet water eleva- tions recorded by Parks Canada have not sign- ificantly changed over the years. The build-up of organic matter on the bottom of the lake accounts for the reduction in water depth. As weeds and other aquatic vegetation - decomposes it is laid down in layers on the lake bottom. This effec- tively reduces the water depth by raising the lake bottom. The surface of the water, however, stays at the same eleva- tion above sea level. Suggestions have been made to permanently fill the lake to a higher level. This would provide greater depth of water but it could also be a danger to existing shoreline property sub- jected to continued high water. . A higher level on the lake would also reduced flood storage and in the event of a severe rain, flooding might occur as water could not be released fast enough from the lake to provide flood storage. "Structurally it's possible to raise the water level and we're willing to look at it," said Fred Aylea of Parks Canada, 'but it must be determined whose pro- perty could be affected negatively by higher levels. We could be liable to any damage caused by such an action." To top everything off, Lake Scugog is a shallow eutrophic lake. Nutrient enrichment of the lake water is primarily due to a combination of the flooding of low land at the creation of the lake and the present surroun- ding land drainage. The nuisance weed af- fecting the lake is Eura- sion water milfoil, a non- native species which is virtually uncontrollable through reductions in nutrient supply. This is due to the relatively low proportion of con- trollable nutrient supply and the ability of the Eurasian water milfoil to grow at its maximum rate in low phosphorus concentrations. Approximately 57 per cent of the phosphorus in Lake Scugog comes from land drainage into the lake. A further 23 per cent comes from precipitation onto the lake surface. Phosphorus input from shoreline cot- tages and Port Perry residents represents on- ly 20 per cent. According to Geoff Carpenter of the Ministry of the Environ- ment, the weeds have been slowly moving north, adapting to lakes where, "Theeretically they're not even suppos- ed to survive." And although he couldn't readily explain why, he said there is 'Some sort of biological check. Something even- tually seems to come in to get rid of milfoil." In the meantime, however, the shoreline residents at the meeting aren't willing to wait for a biological check that could come "some day." Many suggestions, reasonable and unreasonable, were pro- ffered, but the majority of people in attendance wanted immediate ac- tion, this summer. In all likelihood, they won't see it. Parks Canada has agreed to spray the Trent channels at least once, and twice if necessary in order to keep a pathway for boats clear. The channel wasn't sprayed last year, according to MP Allan Lawrence Also this year, 23 new markers will be put out along the channel, ad- ding to the 13 markers previously existing. Members of the task force are hoping a clearly-marked channel will keep boats to gne path, which will also Help keep weeds at bay. '""'And if you think .there's a need for addi- tional markers, com- plain about it,"' Mr. Lawrence said. According to Mayor Taylor, the task force has spent many hours looking at possible solu- tions, but none yet have been chosen. The choices come down to mech- anical cutting and harvesting, expensive and not permanent, chemical treatment, which, at $300 an acre is the cheapest treatment but needs to be done each year; lining the bottom of the lake with a plastic blanket, preventing sunlight from reaching the bottom and stopping weed growth at a cost of $3,000 per acre (and can- not be applied to the en- tire lake) ; and dredging of specific channels or areas of the lake bottom. Bad and good points of each solution were discussed by the people at the meeting and most agreed on two things; the majority didn't like the thought of pouring chemicals in the lake "(despite assurance from Environment represen- tative Geoff Carpenter, that the chemical Reglone-A is completely harmless to everything except plants) ; and they were in favour of dredging. "Dredging was .my first choice too, until the idea had so many holes shot through it, said Mayor Taylor. Not only would the operation cost be pro- hibitive, it would also ruin the natural balance of the lake. And accor- ding to Mr. Carpenter, it Turn to page 2 4) PRE-INVENTOR d i ! Y / ~ nf, 7. Jy nN fia os MAY 29 - 30 - 31 IVES FLORIST WATER STREET PORT PERRY CASH & CARRY PORT PERRY STAR -- Tuesday, May 28, 1985 -- 7 TIME FOR MAKING..: PICKWICK EASTERN PINE Reg. 8.99 ... WHITE PINE - LAVAN BACK Reg. 11.55 ............... COLONIAL PINE PANEL Reg. 1795 .................... BEIGE BURLAP ON LAVAN Reg. 19.60 .............c.cooiiiiii. HOMESTEADER BURNISHED Brown - Reg. 17.20 ..................... VINTAGE PINE PANELLING SALE Now 7.99 Now 10.39 pile Now 15.25 (fi | Now 17.65 tli Now 14.69 \; Now 6.75 4 x 8 Sheets - Cash & Carry \ \ WELDWOOD VINYL SIDING IE, 75.00 Reg. 89.00 96 sq.ft. VINYL GUTTER : Jer) 8 i ty Aluminum SE STEP LADDERS 5 - reg. 38.28... 33.95 | 6 - reg. 44.50. 39.95 / 5" Wide - 10' Long wes] 50) CUPRINOL PAINT REMOVER 20 litre can ................. 89.95 WATER SOFTENER SALT 40 kg. Select - reg. 8.95 7.99 40 kg. Com. - reg. 769.6.99 20 kg. Select - reg. 499 4.49 INTERIOR or EXTERIOR GLIDDEN PAINT 10% Off...... || =~ DOES NOT APPLY TO PAINT ALREADY ON SALE. LAKE SCUGOG LUMBER CO. LTD. 11 VANEDWARD DRIVE - (OSHAWA ROAD) A Sa o QUALITY PRODUCTS ROOF TRUSS DIVISION o QUALIFIED SERVICE DOMTAR SHINGLES 10 Year 4 49 True Seal a Bundle 15 Year 1 1 Hy Endura . Bundle CASH & CARRY .50 BUNDLE DELIVERY LAWNMOWER | One Only - Reg. 267.00 Now 189.00 SHELVING White - 12°x8' - reg 895 7.99 White - 16"x8' - reg. 1150 10.50 Brown - 12°x8" - reg 560 4.99 Brown - 16"x8 reg. 815 7.40 12'x8" reg 895 1.99 reg 1150 10.50 oo PORT PERRY - ONTARIO - PHONE 985-7391 VISA ee - CALL 985-3121 i; i torr 5 Midy have te he Ordered eo COMPETITIVE PRICING