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If point rainfall station weights are not wished to be computed by one of the options offered, then combinations of station codes and weights can respectively be selected from and entered via the screen. Let c~k~ c{~}k~ ,(k=1,N) be the weight factors then the areal rainfall follows from: P~c

P_c,t~ = c~1~ P~1,t~ + c~2~ P~2,t~ _t = c₁ P_1,t + c₂ P_2,t + ... + c~k~ P~k,t~ c_k P_k,t + ... + a~N~ P~N,t~ a_N P_N,t

with:
P~k,t~ =

Section
Column width 4% Pk,t Pc,t Column width 96% point precipitation value at time t of series k

, P~c,t~ =

catchment precipitation value at time t

.
Note that the sum of weights not necessarily adds up to 1, in order to allow orographical adjustments. If for a time step at one or more of the point rainfall stations an observation is missing then automatically a missing value will be entered for the areal rainfall.
The combination of point rainfall stations codes and weights to compute the areal rainfall can be stored in the data base to be used at a later stage for different time periods.

Series

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Codes

Area Series can be selected by selecting a series in the series list box and pressing the Select button. Point Series are selected by selecting a series in the series list box and pressing the '>>' button. To deselect a point series, select the series in the spreadsheet and press '<<'. By selecting more point series at a time, multiple series can be added to the point series spreadsheet, therefore use the <Shift> or <CTRL> key together with your left mouse button.

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