The Tualatin River Basin along the east side of the Coastal Mountains in Oregon is subject to a complex mixture of land uses. Approximately half the area is devoted to forestry production. The remainder is divided between agriculture and urban uses. In addition to this diversity in land use, there...
The report describes the results of model calibration and validation, and evaluates the extent to which runoff response to timber harvesting and increased road densities in East Fork Lobster Creek Basin can be simulated, using Precipitation-Runoff Modeling System (PRMS), a deterministic, destributed-parameter-modeling system.
A study was conducted to compare snow accumulation and melt during rainfall in adjacent forest and clearcut plots in the
transient snow zone of the western Cascade Range in Oregon. Snow accumulation differences were determined by comparing the water equivalents of forest and clearcut snowpacks. During rain-on-snow periods, energy balances...
Characterizing the distribution of precipitation at regional
scales is a requirement for the development of regional scale,
spatially distributed hydrologic water balance models. This
study performs a preliminary assessment of the utility and
limitations of historical hydro-meteorological data for
providing spatially distributed precipitation estimates over
large areas. The historical data...
Ponding of water on roof systems leading to collapse causes expensive damage and jeopardizes the life safety of building occupants. Current building codes and design specifications for flat roof systems offer minimal guidance in designing for ponding loads. The present research investigated ponding load effects on a long span, lightweight...
The rainfall regime of the Cape Verde Islands is influenced
by the Intertropical Convergence Zone (ITCZ) resulting in strong
seasonal trends and frequent thunderstorm events. These
events are frequently responsible for the destruction of riverine
structures and valuable crop land.
A menu driven database program (RIS) was developed for
the...
One-minute rainrates were measured during two winter rainy
seasons in western Oregon to gain insights into the time-structure of
Oregon rainstorms. The averages of three non-dimensional relative
variance statistics were greater on the coast than inland. Rainrate
distributions showed that a greater portion of the total rain fell, at
higher...