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How do I decide on outdoor lighting? - Video
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San Diego, Calif. It is officially summer. The sun is shining and the grass in your backyard is growing quickly. At home, mowing the lawn is one of summertime's most frequent chores and its no different for the solar industry.
Credit: Nihon Shokusei
Weed or vegetation management is particularly important for ground-mounted solar systems. Tall weeds growing around the installation can create shading, which can negatively impact system production. It can also cause hot spot heating if a part of the solar cell is shaded, the cell can heat up to such extreme temperatures that a module can burn out causing permanent damage.
After the feed-in tariff (FIT) program was launched in Japan a few years ago, many ground-mounted PV systems started popping up in the country where small residential roof-top solar systems used to dominate. System owners recognize that growing vegetation under and around PV systems must be minimized to protect their valuable investment.
There are several weed control methods used for PV ground-mount systems in Japan; mowing, spraying herbicide, grazing sheep/goats, and covering the area with weed control sheets, for example. Controlling weeds incurs additional operation and maintenance (O&M) expenses for PV system owners and the long-term costs and benefits need to be carefully examined.
Mowing is the most commonly used method in Japan at this point, but we are looking into other methods, said a project developer in Japan.
Mowing is very labor-intensive and needs to be repeated twice or three times a year. Besides hiring people or renting mowing equipment, there are fees for hauling and disposing the grass clippings. Another project developer commented that it costs between 100-200 yen (US $1-2) per square meter for a 2-MW system, which is typically about 40,000 square meters. Spraying herbicide is relatively inexpensive and requires a low initial investment. But spraying has to be done repeatedly over time and there are environmental concerns associated with certain chemicals in herbicides.
Herbivorous Animals to the Rescue
Last summer, Oita Sekiyu, a gasoline distributor and PV system reseller, built a 1.1-MW solar system on an old salt-pan site in Usa city, Oita prefecture. The company chose emu, the second largest bird in the world and native to Australia, to graze the vegetation growing under the solar system.
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Getting Out of the Weeds: How To Control Vegetative Growth Under Solar Arrays
FAIRBANKSA sinkhole opened up directly beneath a University of Alaska Fairbanks employee this morning, nearly swallowing a riding lawn-mower the size of a golf-cart.
A UAF facilities services employee was mowing the lawn on the hillside near the Taku parking lot on the east side of campus just off Farmers Loop when the ground opened up beneath the mower's front left wheel.
The hole was approximately 10 feet deep, according to estimates. At the surface the hole was about 4 feet by 5 feet across and widened a bit below, according to university spokeswoman Marmian Grimes.
No one was injured in the incident, Grimes said. Facilities Services has since filled in the hole.
A handful of sinkholes have been reported in Fairbanks in the last week, following several weeks of heavy rainfall. The university has dealt with at least three sinkholes on its property one in front of the West Ridge research building and another on the east side of campus, in addition to the one that opened this morning.
Sinkholes can be caused by a number of phenomena. Occasionally they appear due to subsurface erosion from groundwater and can take place in areas where ground has been filled in and not compacted.
Darrin Edson, the superintendent of operations for facilities services, said it's unclear exactly what caused this particular sinkhole, but he said it probably didn't come from recent changes to the soil in the area.
"That hasn't been touched in over 15 years. There's a lot of frozen soils in that area so my guess would be something down below thawed and created a cavity over time, and it just collapsed on that cavity," Edson said. "All the water we've had lately just adds to it and speeds it up."
Contact staff writer Weston Morrow at 459-7520. Follow him on Twitter: @FDNMschools.
Contact staff writer Weston Morrow at 459-7520. Follow him on Twitter: @FDNMschools.
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Sinkhole nearly swallows mower at university campus in Fairbanks
A week following a lawn-mower accident in North Augusta, Dean Perrin said the image of his son, Luke, propped underneath the family's riding-mower is like a 'still picture' embedded in his memory. When I try to sleep, it just flashes to him underneath that tractor, said Perrin Wednesday, minutes after admitting the two-and-a-half year old into emergency surgery at the Children's Hospital of Eastern Ontario. The picture of him haunts me. Luke, who underwent a second surgery Wednesday following the accident on June 29, appears to be recovering well, says his father, despite an enormous wound on his son's right leg. Now they're going to do skin grafting, where they take skin from his inner thigh and put it where the wound is, Perrin added. The procedure has a 95 per cent success rate, he said. But for both parents of the tiny, blonde-haired tot, the events of that day are never far from memory. On the morning of June 29, Dean Perrin began mowing his 38-acre property in North Augusta, including a large fenced-in dog run. As Perrin began mowing the inside of the 100-foot enclosed space, he saw that his son who loves running and playing outdoors was on the outside of the fence, and at the opposite end of the dog-run. When I was halfway to the back... I looked back and saw that he was still at the front gate outside the fence, Perrin said while recalling the incident. I drove another 15-feet, I hit a little stump... Put my foot on reverse and then I turned around and I don't know how he got there but he was right there, underneath the tractor. Perrin said he managed to lift the tractor with one hand while using the other to scoop his son out from under the tractor, ultimately fearing the worst. I frantically looked and just pictured him having no legs, said Perrin, while his wife, Theressa, was in the house with their other children. I said 'Oh my God' he has all of his limbs, and I turned him sideways a bit and I saw the massive gash. While Theressa Perrin called 9-1-1, Dean said he held Luke in his arms, knowing an ambulance might take 20 minutes to get there. I jumped in the truck, I yelled to my little seven-year-old, whos outside screaming, to go get mommy and a towel and get in the truck. Between the time of the accident and before arriving at Brockville General Hospital, Perrin said something miraculous happened. The family quickly sped towards Brockville, says Perrin, but just before arriving at County Road 6, he received a call from Ontario Provincial Police. They said: 'Okay, we're going to meet you and guide you to the hospital. Look for OPP and flash your lights. Driving between 130-140 kilometres-per-hour, Perrin arrived at Parkedale Avenue and North Augusta Road to find that OPP and Brockville Police had worked together to create a pathway. There were road blocks at three different intersections, and every street guiding us all the way to the hospital, Perrin said, referring to the effort has an amazing thing. Just 15 minutes after arriving at BGH, health-care specialists were preparing to transfer Luke to CHEO for further treatment and surgery. And while Perrin said he feels guilty for what happened, the family remains optimistic, hoping to raise an estimated $7,000 for two-months of uncovered home-care treatment. In an effort to help with home-care services and an advanced-healing vacuum unit, family members have set up a donation and Facebook page for anyone who may be interested in helping. But despite the accident, several surgeries and eventual home-care services, the Perrin's said they're just relieved to know Luke will play outside again soon.
FACTBOX: HOW TO HELP Donations for Lukes ongoing care can be made online at: http://www.gofundme.com/HELP-LUKE-WADE https://www.facebook.com/lukewaderecovery
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Horrible injury spawns heart-warming response
Got bugs?
State forestry officials want them specifically any that resemble the dreaded Asian longhorned beetle, an invasive species that can cut a destructive path through maples, elms, willows and other hardwoods.
Turns out the black-and-white tree feasters are drawn to swimming pools. But theyre lousy swimmers. Entomologists discovered pool filters and baskets are a treasure trove for insects of all kinds. In a preemptive strike to keep the Asian longhorned beetle from getting a foothold in the Granite State, state officials are enlisting the help of pool owners across the state.
What were asking people is to just look in their pool filters and look for these huge, glossy black-and-white longhorned beetles, said Kyle Lombard, forest entomologist with the state Division of Forest and Lands.
If anything resembling the longhorned beetle shows up, state officials ask pool owners to take a picture of it and upload the photo at nhbugs.org/asian-longhorned-beetle. To date, the Asian longhorned beetle has not been found in New Hampshire.
Weve learned pool filters are probably the best insect collector in the country, Lombard said Thursday.
State forestry officials got the pool survey idea from Worcester, Mass., where the Asian longhorned beetle caused major damage after first being detected there in 2008, Lombard said.
This thing is a lazy flier and tended to show up in swimming pools in Worcester, Lombard said.
Noel Negroni knows all about bugs in pools. The Manchester resident said he has never seen so many in the 14 years hes had an inground pool at his 204 Prospect St.
Its an infestation, Negroni said. Its like hundreds of them in the pool when I get up every morning.
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Check those pool filters for another invasive species
Posted on Thursday, July 10, 2014 at 9:47 am
Elected officials and the Ashland community will soon have to decide just how much the towns pool in Carter Park is worth. Rough estimates to replace or renovate the aging aquatic facility are running in the neighborhood of at least $1 million, which poses tough questions for a town that had to dip heavily into its savings account just to balance this years budget.
Last spring, the town identified major problems at the pool and decided to start setting aside money for a possible renovation or full-on replacement. Since then, Charles Hartgrove, town manager, said theyve been working with Doug Aurund, of Siska Aurund, a landscape architectural firm based in Tidewater, who is also the original, early 1990s designer of the pool, to identify possible long-term solutions. Current options include renovation and expansion of the existing pool or new construction altogether.
Were just trying to get a baseline of things that we can bring forward as a staff to Parks and Rec and council, Hartgrove said.
Town council voted last year to set aside $100,000 in the capital improvement plan, funding repeated in this years budget for a full, on-hand amount of $200,000.
Though the current pool is fully operational, Hartgrove said that a steady stream of maintenance costs have warranted taking a deeper look at whether continuing to fix problems as they emerge is sustainable.
The most prominent problem, and one that kicked off the initial talks concerning a possible replacement of the pool, was a mysterious leak. Hartgrove said the pool continues to lose water, but theyve been working with contractors to fix what they can.
Just like anything thats got that type of age on it, the best analogy I can give is its like an old car you have to decide at some point, do you replace the transmission and engine and keep running the car for a long time or do you finally bite the bullet and go buy another used car or a new car altogether? Hartgrove said. And I think thats where were at with the pool. Pool future in doubt?
The other, rather obvious, decision the towns elected officials and the greater community will have to make is: Does Ashland continue operating a pool? Thats not a forgone conclusion, Hartgrove said. Ive not heard a lot of feedback that leads me in that direction, but thats definitely something the community needs to discuss and that council needs to discuss: if thats a service they want to continue as part of our Parks and Rec program. Hartgrove has recommended to council assembling a pool committee comprised of community stakeholders, the town Parks and Recreation committee and anyone else in town with any expertise and who might want to help out, with the goal of having a final recommendation in six months to a year. Staff is not going to make a recommendation without clearly vetting this through the community and, ultimately, to town council, he said.
Citizens will also have the chance to weigh in. Later this summer, the town will conduct a citizen survey the first in three years and Hartgrove hopes to tailor a questionaire concerning how the town should address the pool going forward.
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Town officials mull over the options on Carter Park pool
