User's guide of Proceessing Modflow 5.0

Processing Modflow 93
< Parameter Number is used to assign the streambed hydraulic conductance C as a
STR
parameter for an automatic calibration by the inverse models PEST or UCODE, see PEST
Q 1 ' C STR @ (H s & h) h>S BOT
Q 1 ' C STR @ (H s & S BOT ) h#S BOT
d '
< Parameter List... or UCODE < Parameter List....
Similar to the River package, leakage (Q ) to or from the aquifer through the streambed is
1
computed by:
Q@n
C@w@S 1/2
3/5
Fig. 3.23 The Streamflow-Routine Package dialog box
(3.23)
where H is the head in the stream, h is the head in the model cell beneath the streambed and
s
S is the elevation of the bottom of the stream.
BOT
If the option Calculate stream stages in reaches is checked, the depth d in each reach is
calculated from Manning's equation under the assumption of a rectangular stream channel:
(3.24)
3 -1
where Q [L T ] is the calculated stream discharge, n [ - ] is Manning's roughness coefficient,
-1
w [L] is the width of the channel, S [LL ] is the slope of the stream channel and C is a
conversion factor (see eq. 3.22). Although n and C appear separatly here, only the values of n/C
or C/n are used in the computer code. You need therefore only to specify the value of n/C in
PMWIN.
3.6.1 MODFLOW