Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
Welcome to CivilGEO Knowledge Base
The canopy component represents the presence of plants in the landscape. Plants intercept precipitation, reducing the amount of precipitation that arrives at the ground surface. Intercepted water evaporates between storm events. Plants also extract water from the soil in a process called transpiration. Evaporation and transpiration are often combined as evapotranspiration.
In GeoHECHMS, the Simple Canopy method is used to compute the precipitation loss due to evapotranspiration. Selecting a canopy method is optional and generally used for continuous simulation applications. If no canopy method is selected, the subbasin will not compute any losses due to evapotranspiration and all precipitation will be treated as direct precipitation.
The Simple Canopy method provides a simple representation of a plant canopy. In this method, all the precipitation is intercepted until the canopy storage capacity is full. Once the canopy storage is filled, all further precipitation falls to the surface or directly to the soil if no surface representation is included. All potential evapotranspiration will be used to empty the canopy storage until the water in storage has been eliminated. The potential evapotranspiration is multiplied by the crop coefficient to determine the amount of evapotranspiration from canopy storage and later from surface and soil components. Only after the canopy storage has been emptied will the surface, and soil components, use the unused potential evapotranspiration.
Note that the Dynamic Canopy and Gridded Simple Canopy methods are not supported in GeoHECHMS since they are mostly used by researchers or the Army Corps of Engineers.
Follow the steps given below to select a canopy method:
If Kinematic Wave is selected as the runoff method, then the Canopy Data panel will be divided into two surface area sections as shown below.
By default, Surface area #1 is active with the Subbasin area field set as 100 %. However, changing the Subbasin area in Surface area #1 activates the Surface area #2 fields.
In addition, changing the Subbasin area in either Surface area #1 or Surface area #2 adjusts the Subbasin area in the other counterpart such that the total Subbasin area adds to 100%.
To learn how to select a runoff method for a subbasin, refer to this article in our knowledge base.
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