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Leonard Orzol

Hydrologist

Contact Info


Short Biography

Lenny has spent much of his life in Oregon after moving from upstate New York in 1977. After receiving Bachelor of Science degrees in Geology and Mathematics from Portland State University, he stayed to complete a Master of Science degree in Geology while Lisa, his wife, began a teaching career in the Portland area. Lenny began his USGS career while finishing his M.S. He was hired to work on the Volcanic Hazards Program at the Cascades Volcano Observatory at Vancouver, Washington, where he modeled debris flows from Castle Lake on Mt. St. Helens, Washington and from other moraine lakes in the Three Sisters and Mt. Hood areas in Oregon. Lenny was hired to assist in the groundwater investigation of the Portland Basin at the Portland Office of the USGS Oregon Water Science Center. During this investigation, he began to develop his computer programming skills which led to the publication of many useful applications for groundwater modeling such as Modflowarc and Modtools. He has since provided programming skills to assist on many USGS groundwater investigations in Oregon, Florida, and Massachusetts. He currently works mainly for the USGS National Water Information System (NWIS) program that provides web access to the data collected by the USGS at sites in the 48 Water Science Centers nationwide. He continues to assist in current groundwater investigations in Oregon such as the Upper Klamath Basin and other basins of Oregon. In addition, he has developed web sites that provide innovative access to data and results from these investigations to the public.



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Publications

Hinkle, Stephen R.; Morgan, David S.; Orzol, Leonard L.; Polette, Danial J., 2007. Ground Water Redox Zonation near La Pine, Oregon: Relation to River Position within the Aquifer-Riparian Zone Continuum. Geological Survey (U.S.) Scientific Investigations Report 2007-5239, Report: vi, 29 p.; Plate: 30 x 34 inches [Link]

Renken, R. A.; Patterson, R. D.; Orzol, L. L.; Dixon, Joann, 2001. Approach for delineation of contributing areas and zones of transport to selected public-supply wells using a regional ground-water flow model, Palm Beach County, Florida. Water-Resources Investigations Report 2001-4158, 56 p. [Link]

Orzol, Leonard L.; Wozniak, Karl C.; Meissner, Tiffany R.; Lee, Douglas B., 2000. Ground-water and water-chemistry data for the Willamette basin, Oregon. U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], Water-Resources Investigations Report 99-4036, v, 141 p. :ill., maps (some col.) ;28 cm. +1 computer optical disc (4 3/4 in.) [Link]

Orzol, L. L.; Truini, Margot, 1999. Evaluation of factors that influence estimated zones of transport for six municipal wells in Clark County, Washington. U.S. Dept. of the Interior, U.S. Geological Survey ; Branch of Information Services [distributor], Water-Resources Investigations Report 97-4224, iv, 65 p. :ill. (some col.), maps (some col.) ;28 cm.

Snyder, D.T., Wilkinson, J.M., Orzol, L.L., 1998, Use of a ground-water flow model with particle tracking to evaluate ground-water vulnerability, Clark County, Washington: U.S. Geological Survey Water-Supply Paper 2488, 63 p. (Available at http://pubs.er.usgs.gov/publication/wsp2488) [Link]

Orzol, L. L., 1997. User's guide for MODTOOLS; computer programs for translating data of MODFLOW and MODPATH into geographic information system files. U.S. Geological Survey ; Information Services [distributor], Open-File Report 97-240, vii, 86 p. :ill. ;28 cm.

Snyder, D. T.; Wilkinson, J. M.; Orzol, L. L. , 1996. Use of a ground-water flow model with particle tracking to evaluate ground-water vulnerability, Clark County, Washington. U.S. Geological Survey ; Branch of Information Services [distributor], Open-File Report 96-328, vii, 71 p. :ill. (some col.), maps (some col.) ;28 cm.

Orzol, Leonard L.; McGrath, Timothy S. , 1992. Modifications of the U.S. Geological Survey modular, finite-difference, ground-water flow model to read and write geographic information system files. U.S. Geological Survey, Open-File Report 92-50, v, 202 p. ill. ;28 cm.

Laenen, Antonius; Orzol, L. L., 1987. Flood hazards along the Toutle and Cowlitz rivers, Washington, from a hypothetical failure of Castle Lake blockage. U.S. Geological Survey, Water-Resources Investigations Report 87-4055, vii, 29 p. :ill., maps ;28 cm.

Laenen, Antonius; Scott, K. M.; Costa, J. E.; Orzol, L. L., 1987. Hydrologic hazards along Squaw Creek from a hypothetical failure of the glacial moraine impounding Carver Lake near Sisters, Oregon. U.S. Geological Survey, Open-File Report 87-41, viii, 48 p. :ill., maps ;28 cm.






                           

My Science Topics


Science Topic
Subtopic
Water Resourcesground water



My USGS Science Strategy Areas

Data Integration & Interoperability

Hydrology and USGS data on the Web

Hydrology

Currently, Lenny is assisting in the development of an approach to estimate groundwater pumpage and surface water diversions for irrigation and recharge associated with agricultural areas in the Columbia Plateau region of Washington and Oregon. The approach uses a spatially distributed soil water balance model (SOWAT) to account for these estimates. SOWAT makes innovated use of actual evapotranspiration (ET) derived from remotely-sensing land-surface temperature data which are combined with other spatially distributed data sets such as precipitation, seasonality in climatic supply and demand, soil moisture storage, and irrigation practices. The SOWAT model uses simple relations among climatic, soils, land cover, and irrigation data, to compute monthly irrigation requirements and surplus moisture available for recharge.  These values of recharge will be used as input to a numerical groundwater flow model being developed for the Columbia Plateau area.

USGS data on the Web

Lenny continues to provide development and support to access surface water, groundwater, and water-quality information collected by the USGS at sites nationwide via the web. The USGS provides much of these data to the public by way of the National Water Information System (NWIS) which provides access to data collected at approximately 1.5 million sites nationwide as well other nations worldwide. Lenny helps design and implements access to these data. In addition, he has developed many study specific web pages that provide access to data and results from studies conducted the USGS Oregon Water Science Center using new and innovative approaches.

 

 


Contact Information

Leonard Orzol
2130 SW 5th Avenue
Portland, OR 97201
llorzol@usgs.gov
503-251-3270
503-251-3470 - Fax
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