User's guide of Proceessing Modflow 5.0

Processing Modflow 257
analytical solutions because it can be used to simulate complex systems. An example (Folder:
\pm5\examples\basic\basic7a\) containing a stream system (Fig. 6.31) is used to illustrate
most of the features of the Streamflow-Routing package. The example assumes that an aquifer
of 6,000 ft wide by 6,000 ft long is divided into six equally spaced rows and columns. The
2
transmissivity of the aquifer is 0.08 ft /s. Recharge to the aquifer occurs only from stream
leakage. The example includes 7 stream segments with totally 16 reaches. There is one diversion
(segment 2) and two places where streams join (segments 2 and 4 join to make segment 5 and
segments 3, 5, and 6 join to make segment 7). Stream stages are also computed for each reach.
The streams range in width from 5 to 10 ft. Streambed conductance values also vary depending
on the length and width of each stream reach. The hydraulic conductivity of the streambed
-4
deposits is 4 x 10 ft/s.
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
Solution from equation 5
Flow assigned to stream
for each stress period
1.8
0 10 20 30 40 50 60 70 80 90
Times, in days since start of flood
Fig. 6.29 Distribution of streamflow for a 30-day flood event used for the simulation (after
Prudic, 1988)
Fig. 6.30 Model calculated river stage
6.2.7 Simulation of a Flood in a River