Rural Water - Quarter 1, 2011 - (Page 21)
ARRA-funded North Dakota water project pioneers environmentally friendly angle well construction. BY SHARON BORANYAK
ONE OF THE first water supply projects in the U.S. to use angle wells to tap a water source has begun construction of more angle wells in its second phase. The American Recovery and Reinvestment Act (ARRA) of 2009 is funding 75 percent of Phase 2 of the North Burleigh Water Treatment Facility expansion project for a growing rural water district in North Dakota. Topeka, Kan.-based engineering firm Bartlett & West designed a system of wells that drill at a low angle from the banks of the Missouri River to a thin aquifer zone 30 to 40 feet beneath the riverbed, where sand and gravel naturally filter high-quality water conditioned by the river water from above.
“Bartlett & West has come up with an out-of-the box solution to help handle our increasing water demand,” says Doug Neibauer, executive director of South Central Regional Water District, a rural water system located in Burleigh County, north of Bismarck. The district needed a cost-effective method of reaching water from the Missouri River, but traditional river intake was not an option with river depths running only four to 10 feet in Burleigh County. “Angle wells meet all of our criteria for water quality, yield, location and budget constraints.” Neibauer points out water quality has improved since Phase 1 went online in 2008, winning statewide taste tests two years in a row and ranking in the top ﬁve in the National Rural Water Conference taste test in Washington, D.C., in 2009. Angle wells: fewer wells, improved yield, small footprint James Landenberger, P.E., project manager with Bartlett & West’s Bismarck ofﬁce, says that besides providing clean water, angle well construction can be “a cost-saving, environmentally friendly alternative to conventional vertical wells — especially for shallow aquifers and aquifers along water channels.” In describing the emerging water supply technology, he explains that angle wells are strategically placed at an optimum angle to target the place in the aquifer with the best quality water. The lower the angle of the well, the longer the length of well screen in the targeted water zone, and potentially the greater the well’s yield. The wells constructed in both phases will leave a total footprint of only 650 feet, Landenberger continues. Five wells were installed during Phase 1 of the North Burleigh Water Treatment Facility expansion project at shallow angles ranging from 14 to 23 degrees
Angle well set up for well development. One of the Phase 2 angle wells (foreground) is installed and ready for development. The reverse rotary dual tube rig is still in place and is connected to a temporary pump (not shown) to discharge water and fine materials from the well and adjacent aquifer. The technician in the background is preparing to test the yield of an adjacent Phase 2 angle well (already installed and developed). Once the yield is tested and found satisfactory, the well will be joined with the existing angle wells to provide raw water to the nearby water treatment plant.
First Quarter 2011 • 21
Table of Contents for the Digital Edition of Rural Water - Quarter 1, 2011
Rural Water - Quarter 1, 2011
From the President
Engineering Contracts 101
Design-Build is New and Different, But it Works
A New Angle: Environmentally Friendy Angle Well Construction
This Ain't Business...It's Just Personal
Fill Up Your CUPSS Today!
A Joint Letter to NRWA and AWWA Memberships
Throwing My Loop
Index to Advertisers/Advertisers.com
From the CEO
Rural Water - Quarter 1, 2011