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HEC-HMS Technical Reference Manual > Canopy, Surface, Infiltration, and Runoff Volume > Infiltration

Green and Ampt Loss Model

area in a time interval as: f_t=K[\frac{1+(\phi-\theta_i)S_f}{F_t}] in which ft = loss during period t, K … at time t. The precipitation excess on the perviou …

HEC-HMS Technical Reference Manual > Channel Flow

Available Channel Routing Methods

Lag https://www.hec.usace.army.mil/confluence/hmsdocs/hmstrm/channel-flow/lag-model Lag and K …

HEC-HMS Technical Reference Manual > Modeling Reservoirs > Reservoir Routing Concepts and Equations

Spillways

International units (2.0 to 3.0 US Customary units) (Note: RAS manual says 2.6-3.1). For each time step within the simulation … of reservoir pool elevation, a …

HEC-HMS Technical Reference Manual > Evaporation and Transpiration

Hamon Method

radiation. For simulation time steps less than one day, potential evapotranspiration is redistributed for each time step based on a sinusoidal distribution bet …

HEC-HMS Technical Reference Manual > Transform

Available Transform Methods

-Specified Unit Hydrograph User-Specified S-Graph Snyder Unit Hydrograph SCS Unit Hydrograph Clark Unit …

HEC-HMS Technical Reference Manual > Calibration

Calibration Summary Statistics

simulated and observed runoff values, respectively. HEC-HMS also reports observed and computed maximum flow, time … and monthly time step at watershed scale …

HEC-HMS Technical Reference Manual > Canopy, Surface, Infiltration, and Runoff Volume > Infiltration

Deficit and Constant Loss Model

storage capacity. The deficit is the amount of water required at any point in time to bring the soil layer … for every time interval when there is no precipit …

HEC-HMS Technical Reference Manual > Modeling Reservoirs

Outflow Structures Routing Method

For the Outflow Structures Routing Method, the routing is computed by evaluating all outlets defined by the user. After the routing is complete, the program wil …

HEC-HMS Technical Reference Manual > Primer on Models

References0

Diskin, M.H. (1970). "Research approach to watershed modeling, definition of terms." ARS and SCS watershed modeling workshop, Tucson, AZ. Ford, D.T., and Hamil …

HEC-HMS Technical Reference Manual > Geographic Information System (GIS)

Basin Characteristics

the time of concentration for a watershed. Centroidal Flowpath (Lca) The Centroidal Flowpath is a subset of longest …

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