From the Canyon Courier (Vicky Gits):
Aerating the lake during the summer months is expected to increase dissolved oxygen at the bottom of the lake, help lower the lake’s water temperature, produce cooler water going downstream over the dam and help reduce the amount of lakeweed or elodea in the water.
“The biggest concern we have is dissolved oxygen at the bottom of the lake,” said Gerry Schulte, executive director of the [Evergreen Metro District]. “If there isn’t enough (oxygen), the fish have a hard time, and it results in a process that releases iron and manganese into the water, and that creates a bigger treatment problem,” Schulte said.
The diffused aeration system is expected to increase dissolved oxygen concentrations. The new system is projected to run 10 hours at night only and recirculate the entire body of water every two days. The only visual effect will be bubbles on the lake.
Similar systems are currently at the wastewater plant in Kittredge and the Bear Creek reservoir east of Morrison. The Cherry Creek Water Authority is installing one in the Cherry Creek reservoir as well.
Aqua Sierra Inc. of Morrison will provide and install the equipment, which consists of eight underwater diffuser modules placed at an average depth of 20 feet or more. Modules will be placed 100 to 700 feet from the edge of the dam in the deepest part of the lake.
In addition to increasing the amount of dissolved oxygen, aeration is expected to counteract the heat-related water quality issues that occur in the summer months by creating a more constant temperature from top to bottom of the lake. So when the sun is out, it heats the top layer of water. The top layer goes over the dam and contributes to higher downstream temperatures.
More Bear Creek watershed coverage here.
Evergreen: Flushing the pipes
May 21, 2010
From the Canyon Courier:
The Evergreen Metropolitan District will begin the annual water-main flushing program the first week of June and continue through the summer. Affected areas will be Tanoa, El Pinal, Wah Keeney Park, Hiwan Hills and Hiwan. The purpose of water-main flushing is to remove fine particles that settle in the water mains that cause color, taste and odor issues. If you have any questions, contact the Evergreen Metropolitan District at 303-674-4112.
More infrastructure coverage here.
Idledale: Turning dirt for new storage tank project
December 5, 2009
From the Canyon Courier (Vicky Gits):
The construction site is about 5 miles up Grapevine Road on the northeast corner of Grapevine and Sawmill Gulch roads, west of Morrison off Highway 74. All of the water is sourced from four surrounding underground wells. Bosco Constructors of Englewood won the assignment with a bid of $436,000 from about five submissions. Construction is expected to be finished by March. The district is also seeking to replace the cast-iron water pipe that runs from the water storage tank to the distribution system, once all the easements have been obtained. The district is budgeting an increase in water rates of about $10 a month, starting in 2010, to cover debt repayment. The average water bill currently is about $75 a month. The upgrade is being financed with a 30-year, $920,000 loan supplied by U.S. Bank.
More infrastructure coverage here.
