What is "time weight" in the time gage Meteorologic model?

[Ginger]

Could someone tell me to what refers the parameter called "Time Weight" in the Gage Weight method for the meteorologic method, when I have to give a depth weight and a time weight to apply my various hyetograph to my subbasins.

Actually, I would like to know how does the software create the "balanced" hyetograph which will be attributed to my subbsain.

Thank you for your help.

[mf78]

"Time-Weights" are used to compute the time pattern of the computed hyetograph. The temporal pattern comes from the precipitation gage data. The program uses the depth-weights first to compute the total storm precipitation depth for the subbasin. Then the time-weights are used to compute a time pattern to distribute the total depth. The gage weights method does not compute a "balanced" hyetograph. It will compute a hyetograph that is similar to the gaged data. The frequency storm method will compute a "balanced" hyetograph.

[liamwelin]

If I assign two rainfall stations R1 and R2 with gage-weights 0.8 and 0.2 respectively to a subbasin, the total subbasin rainfall will be computed using weighted average method using the specified gaged-weights 0.8 and 0.2

If I assign time-weights as 1 and 0 respectively, does it mean temporal distribution will be proportional to hyetograph at R1?

And if the time-weights are 0.6 and 0.4 will the temporal distribution be proportional to a hyetograph derived from a weighted average hyetograph derived using the specified time-weights 0.6 an 0.4?

[ellie]

Hello,

Can any of you help me with my query here:
http://www.bossintl.com/forums/hec-h...lculation.html ?

You mention above, mf78, "The program uses the depth-weights first to compute the total storm precipitation depth for the subbasin. Then the time-weights are used to compute a time pattern to distribute the total depth." Do you have a source for the equations HEC-HMS uses to do this?

Many thanks,
Ellie.