WMS:Overview of Basin Data Equations: Difference between revisions
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Dodson (Dodson & Associates, 1992) compiled several equations from hydrologic publications. WMS has implemented many of these equations and allows choosing from the ones listed below to automatically compute lag times/times of concentration. Because most of the equations were developed for specific watersheds (e.g. size, land cover etc.) | Dodson (Dodson & Associates, 1992) compiled several equations from hydrologic publications. WMS has implemented many of these equations and allows choosing from the ones listed below to automatically compute lag times/times of concentration. Because most of the equations were developed for specific watersheds (e.g. size, land cover etc.), consider the assumptions made about a given equation, and try to identify one that used watershed conditions similar to the one being studied. The following is a list of the equations available in WMS. The SCS also found that for many cases the lag time could be related to the concentration time by the following equation: | ||
:<math>T_{LAG} = 0.6 \ast T_c </math> | :<math>T_{LAG} = 0.6 \ast T_c </math> | ||
This relationship is always used by WMS to determine lag time when a method for computing time of concentration is chosen, or to compute time of concentration when a method for lag time is chosen. Methods used for lag time begin with | This relationship is always used by WMS to determine lag time when a method for computing time of concentration is chosen, or to compute time of concentration when a method for lag time is chosen. Methods used for lag time begin with ''T<sub>LAG</sub> ='' whereas methods used to compute time of concentration begin with ''t<sub>c</sub>'' =. | ||
===Lag Time Based Equations:=== | ===Lag Time Based Equations:=== | ||
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{{WMSMain}} | {{WMSMain}} | ||
[[Category:Equations| | [[Category:Equations|Basin]] | ||
[[Category:WMS Basins|Basin]] | |||
Latest revision as of 15:53, 7 December 2016
Dodson (Dodson & Associates, 1992) compiled several equations from hydrologic publications. WMS has implemented many of these equations and allows choosing from the ones listed below to automatically compute lag times/times of concentration. Because most of the equations were developed for specific watersheds (e.g. size, land cover etc.), consider the assumptions made about a given equation, and try to identify one that used watershed conditions similar to the one being studied. The following is a list of the equations available in WMS. The SCS also found that for many cases the lag time could be related to the concentration time by the following equation:
This relationship is always used by WMS to determine lag time when a method for computing time of concentration is chosen, or to compute time of concentration when a method for lag time is chosen. Methods used for lag time begin with TLAG = whereas methods used to compute time of concentration begin with tc =.
Lag Time Based Equations:
- Colorado State
- Customized
- Denver
- Eagleson
- Espey
- Putnam
- Riverside County
- SCS
- Taylor Schwartz
- Tulsa District
Time of Concentration Based Equations:
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