WMOD00423

• Title: Currents…Developing Technology for Tomorrow's Challenges
• Date: 1/1/1993
• Weather Modification - Doc Type: Report

- North Unit 5 - See additional test sec-
tions below
- North Unit 6 - Steel-fiber reinforced
shotcrete
- North Unit 7 - Phillips polymer-fiber
reinforced shotcrete
- North Unit 8 - Harbourite polymer-
fiber reinforced shotcrete
- North Unit 9 - Unreinforced shotcrete

Additional test sections may include:

1. Soil Cement (North Unit 5)
2. Exposed modified-bitumen geomem-
brane
3. Geocomposite clay liner (bentonite
clay sandwiched between two layers of
geotextile)

Visual inspection of both the Arnold
and North Unit test sections took place in
spring 1993. Most test sections were in
excellent condition; however, durability
and vandalism may prove problematic for
the exposed systems that do not have a con-
crete cover. Post-construction ponding
tests were also performed on the Arnold
Canal in the spring 1993. These ponding
tests showed that the seepage had de-
creased essentially to zero, indicating that
the liners were installed over this rough,
angular subgrade without significant dam-
age. Future inspections, O&M reports,
laboratory tests, and ponding tests (years
5 and 10) will determine durability and

Canals built through fractured basalt are typical for central
Oregon. Subgrade materials are quite permeable, and seepage
losses are high.

27

life-cycle costs. A report covering construc-
tability, initial ponding tests, construction
costs, and short-term durability is being
prepared for publication in early 1994.
Much of the technology tested at
Deschutes will have application in other
geologic and climatic conditions, espe-
cially those that enjoy higher value
agricultural bases and less severe geologic
conditions. However, the expansion of the
research to include potential test sites in
other geographic locations will also pro-
vide information useful in other areas of
the West.

Acknowledgements: Eric Glover (PN-
700), Jack Haynes (PN-713), Alice Comer
(D-3732), and Jay Swihart (D-3732) serve
as Principal Investigators/or this pro-
gram.. ..

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Ponding tests on the Arnold Canal. In the fore-
ground Is exposed HOPE geomembrane. On the
other side of the ponding dike is a laminated
PVC/geotextile composite.

Visual inspection of the North Unit Canal shows that shotcrete
cover (3 Inches thick) Is performing well after 1 year of service.

-

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,0 u.s. GOVERNMENT PRINTING OFFICE, 1993-840-248