diff --git a/pymt_rafem/data/Rafem/input.yaml b/pymt_rafem/data/Rafem/input.yaml
index 88483c2..a785f7a 100644
--- a/pymt_rafem/data/Rafem/input.yaml
+++ b/pymt_rafem/data/Rafem/input.yaml
@@ -13,7 +13,7 @@ max_rand: 0.1  # multiply by slope for max height of a random perturbation
 dt_day: {{ time_step }}  # timestep (days)
 
 # Random seed
-rand_seed: 1988  # seed for random number generator
+rand_seed: {{ random_seed }}  # seed for random number generator
 
 # Sea level and subsidence parameters
 Initial_SL: {{ sea_level_initial }}  # initial sea level
@@ -32,7 +32,7 @@ sed_sg: {{ sediment_specific_gravity }}  # sediment specific gravity
 init_cut_frac: 1  # initial cut of the channel into land surface
 
 # Avulsion parameters
-super_ratio: 1.0  # normalized SE ratio to trigger avulsion
+super_ratio: {{ superelevation_ratio }}  # normalized SE ratio to trigger avulsion
 short_path: 1  # flag for using shortest path to complete avulsion
 
 # Floodplain and Wetland parameters
diff --git a/pymt_rafem/data/Rafem/parameters.yaml b/pymt_rafem/data/Rafem/parameters.yaml
index 933a579..6541e9a 100644
--- a/pymt_rafem/data/Rafem/parameters.yaml
+++ b/pymt_rafem/data/Rafem/parameters.yaml
@@ -63,6 +63,16 @@ time_step:
       max: 1.0
     units: day
 
+random_seed:
+  description: Random random seed
+  value:
+    type: int
+    default: 1988
+    range:
+      min: 0
+      max: 999999999
+    units: '-'
+
 sea_level_initial:
   description: Initial sea level
   value:
@@ -143,6 +153,16 @@ sediment_specific_gravity:
       max: 100.0
     units: '-'
 
+superelevation_ratio:
+  description: Critical superelevation ratio
+  value:
+    type: float
+    default: 1.0
+    range:
+      min: 0.0001
+      max: 10.0
+    units: '-'
+
 wetland_elevation:
   description: Elevation that wetlands maintain above sea level
   value: