Lake Onega water per year, of which 46% are industrial and household water, 25% is stormwater runoff and 16% is melioration-related drainage. This drainage contains of phosphorus and of nitrogen; respectively of these elements are removed through the River Svir whereas the rest accumulates in the lake. Ships and motor boats (about 8,000 units) bring oil pollution at the level of about per navigation year, as well as phenols (), lead () and oxides of sulfur, nitrogen, and carbon. The lake basin is a major source of granite, marble and black schist in Russia which have been exploited in the area since
Lake Karrinyup Country Club and the short par-4 14th which, due to clever bunkering, presents a number of options off the tee. The championship course scorecard is as follows. Please note that all measurements are from the Black (Championship) tees. Lake Karrinyup is consistently ranked as one of the top 20 courses in Australia. A slip in its ranking early in the 2000s was part of the motive for the Clayton redesign. Lake Karrinyup has played host to four Australian Opens (1952, 1960, 1968, 1974), two Johnnie Walker Classics (2002, 2003), and was the venue for the Perth International since 2012. Lake Karrinyup Country