Hydrology
The Hillsdale wetlands and the Flint Hills National Wildlife Refuge
wetlands both can be found along latitude 38 degrees. Even though they share
this commonality, they vary greatly in size. The drainage area for the
gauging stations near each wetland also are drastically different in size.
The Hillsdale Lake gauging station has a drainage area of only 144 square
miles. The gauging station closest to Flint Hills National Wildlife Refuge,
the Neosho River at Strawn, KS guaging station, has a drainage area of 2,933
square miles. This is more than 20 times that of Hillsdale.
Below are maps of the locations of each guaging station.
Neosho River at Strawn, KS guaging station:

Image taken from USGS website.
Hillsdale gauging station:

Image taken from USGS website.
Annual Mean Stream Flow and Monthly Mean Stream Flow are both available for
each site.
Hillsdale Annual Mean Stream Flow
Year | Cubic feet per second |
| 1983 | 902
| 1987 | 907
| 1988 | 911
| 1989 | 913
| 1990 | 917
| 1991 | 916
| 1992 | 917
| 1993 | 919
| 1994 | 917
| 1995 | 917
| 1996 | 917
| 1997 | 917
| 1998 | 918
| 1999 | 917
| | | | | | | | | | | | | |
New Strawn's Annual Mean Stream Flow
Year | Cubic feet per second |
| 1949 | 1569
| 1950 | 1507
| 1951 | 5097
| 1952 | 876
| 1953 | 99.4
| 1954 | 80.1
| 1955 | 164
| 1956 | 54.7
| 1957 | 1012
| 1958 | 1472
| 1959 | 1324
| 1960 | 1626
| 1961 | 918
| 1962 | 917
| | | | | | | | | | | | | |
Notice how the Strawn station showed its highest
flow in 1951. This was probably due to the flood of 1951. It appears that the
construction of the John Redmond Damn which began in June of 1959, the embankment
was completed in September of 1963, and the damn was
completed for full flood control operation by September of 1964 (USACE John Redmond)[May 1st, 2003],
did not greatly alter the annual mean stream flow of Strawn.
It is interesting to note that Strawn's flow is typically about 600-1000 cfs
higher than Hillsdale's. This could cause the wetlands at Flint Hills to be moister
or it may mean that there is more water available to the wetlands of Flint Hills than
Hillsdale's wetlands. Hillsdale does not show a record of extremely high stream
flow, even in 1993 when flooding occured throughout the state. This may be due to the
damn itself and its regulatory capabilities.
Hillsdale Monthly Mean Stream Flow (cubic feet per second)
Year | Jan | Feb | Mar | Apr | May | Jun | Jul | aug | Sep | Oct | Nov | Dec |
1982| | | | | 894 905 901 898 898 898 898 898
1983 899 899 898 909 910 907 907 906 901 898 897 893
1984 893 893 896 901 899 906 901 900 901 906
1985 911 913 918 917 917 921 917 917 917 920 916
1986 915 915 916 918 917 918 917 918 927 919 915
1987 907 907 910 907 906 906 907 906 906 905 905 906
1988 907 908 908 913 913 912 913 912 912 912 911 912
1989 912 912 912 913 913 914 914 913 913 913 915 915
1990 915 915 917 918 922 921 917 917 917 916 916 916
1991 916 916 916 916 917 918 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |