diff --git a/core/src/parameter.jl b/core/src/parameter.jl
index d16b793a8..88ee5d5b1 100644
--- a/core/src/parameter.jl
+++ b/core/src/parameter.jl
@@ -241,12 +241,9 @@ struct TabulatedRatingCurve{C} <: AbstractParameterNode
 end
 
 """
-Requirements:
-
-* from: must be (Basin,) node
-* to: must be (Basin,) node
-
 node_id: node ID of the LinearResistance node
+inflow_id: node ID across the incoming flow edge
+outflow_id: node ID across the outgoing flow edge
 active: whether this node is active and thus contributes flows
 resistance: the resistance to flow; `Q_unlimited = Δh/resistance`
 max_flow_rate: the maximum flow rate allowed through the node; `Q = clamp(Q_unlimited, -max_flow_rate, max_flow_rate)`
@@ -254,6 +251,8 @@ control_mapping: dictionary from (node_id, control_state) to resistance and/or a
 """
 struct LinearResistance <: AbstractParameterNode
     node_id::Vector{NodeID}
+    inflow_id::Vector{NodeID}
+    outflow_id::Vector{NodeID}
     active::BitVector
     resistance::Vector{Float64}
     max_flow_rate::Vector{Float64}
@@ -263,8 +262,11 @@ end
 """
 This is a simple Manning-Gauckler reach connection.
 
-* Length describes the reach length.
-* roughness describes Manning's n in (SI units).
+node_id: node ID of the ManningResistance node
+inflow_id: node ID across the incoming flow edge
+outflow_id: node ID across the outgoing flow edge
+length: reach length
+manning_n: roughness; Manning's n in (SI units).
 
 The profile is described by a trapezoid:
 
@@ -288,13 +290,15 @@ Requirements:
 * from: must be (Basin,) node
 * to: must be (Basin,) node
 * length > 0
-* roughess > 0
+* manning_n > 0
 * profile_width >= 0
 * profile_slope >= 0
 * (profile_width == 0) xor (profile_slope == 0)
 """
 struct ManningResistance <: AbstractParameterNode
     node_id::Vector{NodeID}
+    inflow_id::Vector{NodeID}
+    outflow_id::Vector{NodeID}
     active::BitVector
     length::Vector{Float64}
     manning_n::Vector{Float64}
diff --git a/core/src/read.jl b/core/src/read.jl
index 9b84fed30..042454dde 100644
--- a/core/src/read.jl
+++ b/core/src/read.jl
@@ -230,7 +230,7 @@ function initialize_allocation!(p::Parameters, config::Config)::Nothing
     return nothing
 end
 
-function LinearResistance(db::DB, config::Config)::LinearResistance
+function LinearResistance(db::DB, config::Config, graph::MetaGraph)::LinearResistance
     static = load_structvector(db, config, LinearResistanceStaticV1)
     defaults = (; max_flow_rate = Inf, active = true)
     parsed_parameters, valid =
@@ -242,8 +242,12 @@ function LinearResistance(db::DB, config::Config)::LinearResistance
         )
     end
 
+    node_id = NodeID.(NodeType.LinearResistance, parsed_parameters.node_id)
+
     return LinearResistance(
-        NodeID.(NodeType.LinearResistance, parsed_parameters.node_id),
+        node_id,
+        inflow_id.(Ref(graph), node_id),
+        outflow_id.(Ref(graph), node_id),
         BitVector(parsed_parameters.active),
         parsed_parameters.resistance,
         parsed_parameters.max_flow_rate,
@@ -321,7 +325,7 @@ function TabulatedRatingCurve(db::DB, config::Config)::TabulatedRatingCurve
     return TabulatedRatingCurve(node_ids, active, interpolations, time, control_mapping)
 end
 
-function ManningResistance(db::DB, config::Config)::ManningResistance
+function ManningResistance(db::DB, config::Config, graph::MetaGraph)::ManningResistance
     static = load_structvector(db, config, ManningResistanceStaticV1)
     parsed_parameters, valid =
         parse_static_and_time(db, config, "ManningResistance"; static)
@@ -330,8 +334,12 @@ function ManningResistance(db::DB, config::Config)::ManningResistance
         error("Errors occurred when parsing ManningResistance data.")
     end
 
+    node_id = NodeID.(NodeType.ManningResistance, parsed_parameters.node_id)
+
     return ManningResistance(
-        NodeID.(NodeType.ManningResistance, parsed_parameters.node_id),
+        node_id,
+        inflow_id.(Ref(graph), node_id),
+        outflow_id.(Ref(graph), node_id),
         BitVector(parsed_parameters.active),
         parsed_parameters.length,
         parsed_parameters.manning_n,
@@ -1029,8 +1037,8 @@ function Parameters(db::DB, config::Config)::Parameters
         error("Invalid edge(s) found.")
     end
 
-    linear_resistance = LinearResistance(db, config)
-    manning_resistance = ManningResistance(db, config)
+    linear_resistance = LinearResistance(db, config, graph)
+    manning_resistance = ManningResistance(db, config, graph)
     tabulated_rating_curve = TabulatedRatingCurve(db, config)
     fractional_flow = FractionalFlow(db, config)
     level_boundary = LevelBoundary(db, config)
diff --git a/core/src/solve.jl b/core/src/solve.jl
index 75c594ff4..4fb734021 100644
--- a/core/src/solve.jl
+++ b/core/src/solve.jl
@@ -336,24 +336,24 @@ function formulate_flow!(
     (; graph) = p
     (; node_id, active, resistance, max_flow_rate) = linear_resistance
     for (i, id) in enumerate(node_id)
-        basin_a_id = inflow_id(graph, id)
-        basin_b_id = outflow_id(graph, id)
+        inflow_id = linear_resistance.inflow_id[i]
+        outflow_id = linear_resistance.outflow_id[i]
 
         if active[i]
-            h_a = get_level(p, basin_a_id, t; storage)
-            h_b = get_level(p, basin_b_id, t; storage)
+            h_a = get_level(p, inflow_id, t; storage)
+            h_b = get_level(p, outflow_id, t; storage)
             q_unlimited = (h_a - h_b) / resistance[i]
             q = clamp(q_unlimited, -max_flow_rate[i], max_flow_rate[i])
 
             # add reduction_factor on highest level
             if q > 0
-                q *= low_storage_factor(storage, p.basin.node_id, basin_a_id, 10.0)
+                q *= low_storage_factor(storage, p.basin.node_id, inflow_id, 10.0)
             else
-                q *= low_storage_factor(storage, p.basin.node_id, basin_b_id, 10.0)
+                q *= low_storage_factor(storage, p.basin.node_id, outflow_id, 10.0)
             end
 
-            set_flow!(graph, basin_a_id, id, q)
-            set_flow!(graph, id, basin_b_id, q)
+            set_flow!(graph, inflow_id, id, q)
+            set_flow!(graph, id, outflow_id, q)
         end
     end
     return nothing
@@ -438,17 +438,17 @@ function formulate_flow!(
     (; node_id, active, length, manning_n, profile_width, profile_slope) =
         manning_resistance
     for (i, id) in enumerate(node_id)
-        basin_a_id = inflow_id(graph, id)
-        basin_b_id = outflow_id(graph, id)
+        inflow_id = manning_resistance.inflow_id[i]
+        outflow_id = manning_resistance.outflow_id[i]
 
         if !active[i]
             continue
         end
 
-        h_a = get_level(p, basin_a_id, t; storage)
-        h_b = get_level(p, basin_b_id, t; storage)
-        bottom_a = basin_bottom(basin, basin_a_id)
-        bottom_b = basin_bottom(basin, basin_b_id)
+        h_a = get_level(p, inflow_id, t; storage)
+        h_b = get_level(p, outflow_id, t; storage)
+        bottom_a = basin_bottom(basin, inflow_id)
+        bottom_b = basin_bottom(basin, outflow_id)
         slope = profile_slope[i]
         width = profile_width[i]
         n = manning_n[i]
@@ -478,8 +478,8 @@ function formulate_flow!(
 
         q = q_sign * A / n * R_h^(2 / 3) * sqrt(Δh / L * 2 / π * atan(k * Δh) + eps)
 
-        set_flow!(graph, basin_a_id, id, q)
-        set_flow!(graph, id, basin_b_id, q)
+        set_flow!(graph, inflow_id, id, q)
+        set_flow!(graph, id, outflow_id, q)
     end
     return nothing
 end