diff --git a/lecture/mhs/groundwater/contourplots.py b/lecture/mhs/groundwater/contourplots.py
index 63438a53d3f2b81ee3a6c12856e927319cbabade..b0d227ddf4d82a30dde205f710f59306ba8b4cb0 100644
--- a/lecture/mhs/groundwater/contourplots.py
+++ b/lecture/mhs/groundwater/contourplots.py
@@ -2,7 +2,7 @@ import matplotlib.pyplot as plt
 import numpy as np
 import pandas as pd
 
-#Instructions: First execute the `groundwater` test, a file called "contourFile.txt" will be written to the respective build-cmake folder. Within the build-cmake/.../groundwater folder you can then run the python script via e.g. `python3 contourPlots.py` to plot the contour and streamlines of the given problem.
+#Instructions: First execute the `groundwater` test, a file called "contourfile.txt" will be written to the respective build-cmake folder. Within the build-cmake/.../groundwater folder you can then run the python script via e.g. `python3 contourPlots.py` to plot the contour and streamlines of the given problem.
 
 plt.rcParams.update({'font.size': 10})
 
@@ -27,7 +27,7 @@ cells = parameters.get("Cells").split()
 nx = int(cells[0])
 ny = int(cells[1])
 #read in the data which should be plotted
-myData = pd.read_csv('contourFile.txt') #choose the correct name of the data file
+myData = pd.read_csv('contourfile.txt') #choose the correct name of the data file
 
 #-------PREPARING DATA FOR CONTOUR PLOT-------
 xArray = myData['x'].values #read in a pandas data column and immediately convert it to a numpy array
diff --git a/lecture/mhs/groundwater/groundwaterproblem.hh b/lecture/mhs/groundwater/groundwaterproblem.hh
index 7396bb8d1a38f3443a9df4fec35a5f8fcb9be549..0e05b99dc3f3bc1458ad14dc80c36dda9054c887 100644
--- a/lecture/mhs/groundwater/groundwaterproblem.hh
+++ b/lecture/mhs/groundwater/groundwaterproblem.hh
@@ -416,7 +416,7 @@ public:
         std::cout << "------------------------------------------------------------"<<std::endl;
 
         std::ofstream contourFile;
-        contourFile.open("contourFile.txt");
+        contourFile.open("contourfile.txt");
         contourFile << "x,y,h,v_x,v_y" << std::endl;
 
         for (const auto& element : elements(this->gridView()))
@@ -439,8 +439,6 @@ public:
 
             contourFile << std::setprecision(15) << x << "," << y << "," << piezo << "," << v_x << "," << v_y << std::endl;
         }
-
-        contourFile.close();
     }
 
 private: