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WARMF: Engineering Module
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The engineering module is a dynamic watershed simulation model that calculates daily runoff, ground water flow, hydrology and water quality of river segments and stratified reservoirs.
WARMF divides a watershed into land catchments, stream segments, and lake layers. Land catchments are further divided into canopy and soil layers. These watershed compartments are connected to form a network for hydrologic and water quality simulations. |
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land surface is characterized by its land uses and cover, which may
include forested areas, agriculture lands, or urbanized cities.
Daily precipitation, which includes rain and snow, is deposited on
the land catchments. WARMF performs daily simulations of snow and soil
hydrology to calculate surface runoff and groundwater accretion to river
segments. The water is then routed from one river segment to the next
downstream river segment until it reaches the terminus of the watershed.
The associated point and nonpoint loads are also routed through the
system. Heat budget and mass balance calculations are performed to
calculate the temperature and concentrations of various water quality
constituents in each soil layer, river segment, and lake layer. |
Dillon Reservoir Watershed
application of WARMF
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WARMF catchment input dialog
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The algorithms of WARMF were derived from many well established codes. Algorithms for snow hydrology, groundwater hydrology, river hydrology, lake hydrodynamics and mass balance for acid base chemistry were based on the ILWAS model. Algorithms for erosion, deposition,
resuspension, and transport of sediment were adapted and modified from ANSWERS. The pollutant accumulation on land surface was modified from the Storm Water Management Model. Instead of using export coefficients, the algorithm for mixing and washoff was used to simulate the processes that generate nonpoint source loading. The first order decay of coliform and BOD and its impact on dissolved oxygen follows the traditional water quality models. The sediment
sorption-desorption of pesticides and phosphorus and the kinetics of nutrients and algal dynamics were adapted from WASP5.
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