Corps of Engineers' Experience with Automatic Calibration of a Precipitation-runoff Model
Corps of Engineers' Experience with Automatic Calibration of a Precipitation-runoff Model

Author: David T. Ford

Publisher:

Published: 1980

Total Pages: 20

ISBN-13:

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Computer program HEC-1, a precipitation-runoff model widely used throughout the United States, includes the capability to estimate automatically any of twelve parameters necessary to model the precipitation-runoff process and the channel routing process. The parameter estimation scheme employs Newton's method to minimize a weighted sum of squares of differences between observed and computed hydrograph values. Applications of this parameter estimation procedure are presneted, and typical steps of the procedure for deterimining optimal parameter estimates are outlined. Recent efforts to improve the estimation algorithm and recent use of the calibration capability to update sequentially parameter estimates in a flood forecasting application are discussed. (Author).

Documentation Needs for Water Resources Models
Documentation Needs for Water Resources Models

Author: William K. Johnson

Publisher:

Published: 1982

Total Pages: 28

ISBN-13:

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Computer program documentation is important to proper model use. Common causes of poor documentation include: organizational negligence and lack of capability, difficulty in clearly communicating a description of the model, motivation on the part of the modeler to prepare good documentation, absence of examples of good documentation, inadequate time funds, staff. (Author).

Determination of Land Use from Satellite Imagery for Input to Hydrologic Models
Determination of Land Use from Satellite Imagery for Input to Hydrologic Models

Author: Robert P. Webb

Publisher:

Published: 1980

Total Pages: 28

ISBN-13:

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A land use/land cover identification methodology using LANDSAT imagery has been applied to six watersheds across the U.S. The land use information is stored in a grid cell data bank and is the basis for calibration of hydrologic parameters for watershed models. Flood frequency studies have been completed on four of the watersheds with land use derived from both satellite data and conventional low altitude aerial photography. This paper discusses our experience using the LANDSAT land use classification procedure and compares hydrologic results obtained from the alternative determinations of land use. (Author).

Training the Practitioner
Training the Practitioner

Author: William K. Johnson

Publisher:

Published: 1981

Total Pages: 32

ISBN-13:

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The Hydrologic Engineering Center, Corps of Engineers has been training water resource professionals since 1964. The Center's training program includes training courses, workshops, seminars, individual training, a university cooperative advanced study program, video tape library and numerous publications. (Author).

Developing and Managing a Comprehensive Reservoir Analysis Model
Developing and Managing a Comprehensive Reservoir Analysis Model

Author: Richard J. Hayes

Publisher:

Published: 1988

Total Pages: 22

ISBN-13:

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The Corps' Hydrologic Engineering Center (HEC) has developed a generalized simulation model capable of analyzing complex river-reservoir systems. The development of the model, 'HEC-5, Simulation of Flood Control and Conservation Systems' (Eichert, 1974, 1975) has been paced by the changing mission of the Corps as well as the evolution of computer systems. HEC-5 development and management, including code development, testing, documentation, training and field application experience, is discussed. (fr).