The lack of cost-effective, reliable sampling methods for many wetland
characteristics hinders efforts to describe the structural and functional
properties of wetlands. This study evaluated techniques for sampling the
subsurface hydrology and invertebrates of freshwater wetlands. The depth of
rusting on mild steel rods was compared with water well measurements...
Water tables in many soils of the Willamette Valley of Western
Oregon are often near the surface. This is because they are underlain
by a relatively impermeable layer at a shallow depth, and the rainfall
during the winter months greatly exceeds the evapotranspiration. The
high water tables combined with fine-textured...
Aerial photo cruising that can be accomplished quickly, cheaply and with a satisfactory degree of accuracy has been the goal of many forest mensurationists throughout the world. As early as 1925, photo cruising was accomplished successfully by Professor R. Hugershoff and his associates in Germany. The development of this technique...
Evapotranspiration (ET) is the process by which water is transferred from land to the atmosphere. ET is the second most important component of a hydrologic budget and remains difficult to estimate. The primary objective of this project was to determine the limitations of estimating ET from water table elevation fluctuations...
Groundwater is an important resource in
Oregon. As more people depend on groundwater,
some water tables around the State are dropping,
threatening their water supplies. State law
requires that groundwater be managed as a
renewable resource, and that water tables do not
drop permanently.
This study was designed and implemented to observe
the spatial and temporal dynamics of groundwater levels
and temperatures adjacent to a beaver pond in semi-arid
central Oregon. The study site was located on the eastern
boundary of Painted Hills National Monument along Bridge
Creek, a tributary to the John Day...