Initial cond: Add Discharge generator.

src/Model/InitialConditions/InitialConditions.py

@@ -226,3 +226,7 @@ class InitialConditions(object):
             reverse = not is_reverse,
             key = lambda d: d['kp']
         )
+
+    def generate_discharge(self, discharge:float):
+        for d in self._data:
+            d['flow'] = discharge