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Encyclopedia > Antecedent moisture

Antecedent moisture is a term from the fields of Hydrology and sewage collection and disposal that describes the relative wetness or dryness of a watershed or sanitary sewershed. Antecedent moisture conditons change continuously and can have a very significant effect on the flow responses in these systems during wet weather. Antecedent moisture conditions can have a very significant impact on the response to rainfall in hydrologic systems and separate sanitary sewer system. Within the field of hydrologic modeling, there are several techniques and commercially available packages that attempt to address the impacts of antecedent moisture conditions. They include programs such as HSPF, Mouse RDII and i3D. Water covers 70% of the Earths surface. ... Urban areas require some method for collection and disposal of sewage. ... Watershed has more than one meaning: Look up watershed in Wiktionary, the free dictionary. ...


HSPF

HSPF or the Hydrologic Simulation Program - Fortran is a conceptual, continuous hydrological transport model designed to simulate all the water quantity and water quality processes that occur in a watershed, including sediment transport and movement of contaminants. Although it is usually classified as a lumped model, it can reproduce spatial variability by dividing the basin in hydrologically homogeneous land segments and simulating runoff for each land segment independently, using different meteorologic input data and watershed parameters. The model includes fitted parameters as well as parameters that can be measured in the watershed. HSPF is a model based on first principles, such as the principles of energy, momentum and continuity, and relies on measurements of many parameters for input and simulation. HSPF has its origin in the Stanford Watershed Model developed by Crawford and Linsley (1966). This model, frequently cited in the literature as being one of the first comprehensive watershed models, has been widely used and has undergone numerous modifications and additions. River in Madagascar relatively free of sediment load An hydrological transport model is a mathematical model used to simulate river or stream flow and calculate water quality parameters. ... Watershed has more than one meaning: Look up watershed in Wiktionary, the free dictionary. ... In a formal logical system, that is, a set of propositions that are consistent with one another, it is probable that some of the statements can be deduced from one another. ...


Mouse RDII

Mouse RDII or the Rainfall Dependent Inflow & Infiltration Module of the commercially available Mouse program from the Danish Hydraulic Institute (DHI) provides detailed, continuous modeling of the complete land phase of the hydrologic cycle, providing support for urban, rural, and mixed catchments analyses. Precipitation is routed through four different types of storage: snow, surface, root zone and ground water, resulting in more accurate hydrographs. The model allows a continuous, long-term analysis that can be used to look at periods of both wet and dry weather, as well as inflows and infiltration to the sewer network. Mouse RDII is a model based on first principles, such as the principles of energy, momentum, and continuity. The model relies on measurements of many parameters for input and simulation. In a formal logical system, that is, a set of propositions that are consistent with one another, it is probable that some of the statements can be deduced from one another. ...


i3D

i3D stands for inflow and infiltration identification and is a commercially available program from i3D Technologies. i3D is a hydrologic model for simulating antecedent moisture effects on wet weather events in sanitary collection systems. The i3D model was developed from system identification theory, which is a scientific field of modeling within control systems and aerospace engineering. System identification is applied in several fields beyond engineering, ranging from economics to astronomy and comes under other names such as inverse modeling, time series analysis, and empirical physical modeling. The modeling approach is unique because it is guided by system observations (i.e. data) and mathematical routines are used to generate the correct model structure, rather than physically based first principles such as conservation of energy, momentum, and continuity. This is in contrast to assuming that the correct model is known before hand, as is typically the case for modeling within civil engineering. The i3D technique allows information within the observations to guide the modeling algorithms so that only the relevant and observed dynamics are present in the model structure. The resulting models are not black box and have parameters and structure that tie directly to physical understanding and interpretation. System identification is a general term to describe mathematical tools and algorithms that build dynamical models from measured data. ... A control system is a device or set of devices that manage the behavior of other devices. ... Aerospace engineering is the branch of engineering that concerns aircraft, spacecraft, and related topics. ... System identification is a general term to describe mathematical tools and algorithms that build dynamical models from measured data. ... Engineering is the application of scientific and mathematical principles to develop economical solutions to technical problems, creating products, facilities, and structures that are useful to people. ... Face-to-face trading interactions among on the New York Stock Exchange trading floor Economics, as a social science, studies human choice behavior and how it effects the production, distribution, and consumption of scarce resources. ... A giant Hubble mosaic of the Crab Nebula. ... In a formal logical system, that is, a set of propositions that are consistent with one another, it is probable that some of the statements can be deduced from one another. ... Black box is technical jargon for a device or system or object when it is viewed primarily in terms of its input and output characteristics. ...


 
 

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