Merge pull request #354 from ImperialCollegeLondon/barneydobson-patch-2

Update design_graphfcns.py

src/swmmanywhere/graphfcns/design_graphfcns.py

@@ -151,15 +151,15 @@ def process_successors(
         hydraulic_design (parameters.HydraulicDesign): A HydraulicDesign parameter
             object
     """
+    # Find contributing area with ancestors
+    # TODO - could do timearea here if i hated myself enough
+    anc = nx.ancestors(G, node).union([node])
+    tot = sum([G.nodes[anc_node]["contributing_area"] for anc_node in anc])
+    M3_PER_HR_TO_M3_PER_S = 1 / 60 / 60
+    Q = tot * hydraulic_design.precipitation * M3_PER_HR_TO_M3_PER_S
+
     for ix, ds_node in enumerate(G.successors(node)):
         edge = G.get_edge_data(node, ds_node, 0)
-        # Find contributing area with ancestors
-        # TODO - could do timearea here if i hated myself enough
-        anc = nx.ancestors(G, node).union([node])
-        tot = sum([G.nodes[anc_node]["contributing_area"] for anc_node in anc])
-
-        M3_PER_HR_TO_M3_PER_S = 1 / 60 / 60
-        Q = tot * hydraulic_design.precipitation * M3_PER_HR_TO_M3_PER_S
 
         # Design the pipe to find the diameter and invert depth
         diam, depth = design_pipe(