There are three main objectives of this monograph: (i) to provide an introduction to geographical information technology along with an historical perspective on the evolving role of Geographic Information Systems (GIS) in planning, (ii) to overview relevant methods and techniques for GISbased land-use suitability mapping and modeling, and (iii) to identify the trends, challenges and prospects of GIS-based land-use suitability analysis. The monograph focuses on two perspectives of GIS-based land-use suitability analysis: the techno-positivist perspective and the socio-political, public participation perspectives. It is organized into six chapters. After an introductory setting chapter, which defines the scope of land-use suitability analysis, an overview of relevant GIS technology is provided in Chapter 2. Chapter 3 offers an historical account of the development of GIS. It also discusses the development of GIS in the context of evolving perspectives of planning. Chapter 4 gives an overview of the methods for GIS-based land-use suitability modeling. The overview provides a background against which selected case studies are discussed in Chapter 5. The concluding chapter summarized the main points of the monographs and discusses problems and prospects for GIS-based land-use suitability analysis.

ABSTRACT: This study addresses questions related to flood-control operating procedures followed by the U.S. Army Corps of Engineers, Rock Island District. Application is presented of a mixed integer linear programming model for a reservoir system analysis of three U.S. Army Corps of Engineers ’ projects on the Iowa and Des Moines rivers. A strategy for evaluating the value of coordinated reservoir operations is developed. Results of this study suggest that operating Coralville Reservoir, on the Iowa River, for flood control on the Mississippi River does not provide appreciable benefits and, therefore, an operation plan coordinating releases from Coralville Reservoir with the two reservoirs on the Des Moines River may be unnecessary. Damage-minimizing results were obtained by operating the three reservoirs independently for 8 of the 10 largest flood events on record. Also, a review of the operating procedures for the flood of 1993 illustrates how much damage could have been reduced if inflows could be predicted months in advance or if the existing operating rules were more averse to extreme flood events.

Risk management can enhance all aspects of the management of aging dams. Risk analysis can strengthen the identification and understanding of dam safety issues. Risk assessment can provide valuable information on the risk reduction characteristics and benefits of structural and non-structural risk reduction options. In addition, to being useful for technical purposes, risk assessment outcomes can strengthen the case for funding capital improvements, additional investigations, and on-going dam safety activities, such as monitoring and surveillance and emergency management. A portfolio risk assessment and an individual dam risk assessment, which the authors have completed for owners and a regulator, are summarized to provide specific examples of the use of risk analysis, risk assessment and risk management in gaining insights, exploring options, and justifying safety improvements at aging dams.

Implementation of this Comprehensive Conservation Plan and alternative management actions/programs has been assessed consistent with requirements of the National Environmental Policy Act (42 U.S.C. 4321 et seq.).

this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. The findings of this report are not to be construed as an official Department of the Army position, unless so designated by other authorized documents. PRINTED ON RECYCLED PAPER Technical Report EL-99-8 March 1999 Natural Attenuation of Explosives in Soil and Water Systems at Department of Defense Sites: Interim Report

The purpose of this study is to understand hydrologic behavior at a small semi-arid mountainous watershed in order to construct a hydrologic model, which can later be scaled up to larger watersheds in the same region. We took a data intensive approach to understand the hydrologic processes acting in the watershed. Measurements used included maps of snow water equivalence surveyed manually on a 30 m grid, streamflow, precipitation, weather and radiation. Wind driven snow drifting combined with variable radiation exposure on rough terrain produces a consistent (from year to year) spatial distribution of snowpack in the watershed. Spatial variability of surface water input is identified as the dominant hydrologic process in this watershed. We use the drift factor approach to parameterize wind blown snow drifting in the watershed. The drift factors are obtained by calibration using manually surveyed snow water equivalence maps during the accumulation and drift period. Earlier studies have ...

Computer Laboratory are freely available via the Internet:

Approved for public release; distribution is unlimited Prepared for U.S. Army Corps of Engineers Washington, DC 20314-1000ABSTRACT: Long-term monitoring (LTM) of remediated sites can be required on a quarterly basis for 30 or more years before site closure, with costs for sample collection, shipment, and analysis at an offsite fixed laboratory contributing 50 to 75 percent of the total expense. Cost-effective sampling techniques and field analysis could substantially reduce these costs. This technical report identifies and describes proven and promising sampling devices and onsite analytical instrumentation that potentially could be used now for LTM of ordnance-related compounds in groundwater. Instrumentation that generates data which can be used for regulatory decisions must be sufficiently sensitive to detect analytes of concern at action levels and must have excellent precision and accuracy to meet data quality requirements. Instrumentation for LTM must provide rigorous qualitative as well as quantitative identifications. The following general categories of field analytical technologies applicable to volatile organic chemicals and organic ordnance-related chemicals are included in this report: water quality monitors associated with low-flow purge techniques, discrete interval samplers, immunoassay for detection of explosives, gas

Acknowledgements: We would like to extend our appreciation to the following people who have provided valuable comments and insights during the course of this study: Kevin Berry and Leo Korn from New Jersey Department of Environmental Protection, Ann Ertman with Amy S. Greene Environmental Consultants, Inc. and members of the MidAtlantic Wetland Working Group. We also thank Pat Ryan and Paul Brangs for their roles as team leaders along with a host of technicians and students who helped with the field portion of this study. We greatly appreciate the efforts and patience of Niki Learn, Terri Tucker and Sue

has conducted an Environmental Assessment (EA) of the potential environmental