diff --git a/src/structure/structure.ts b/src/structure/structure.ts
index a1bed2727d2da4dfe06a8f316bb955a6a312d2a1..6274720a964e03f1c881d8bcc911f5bb13aa2815 100644
--- a/src/structure/structure.ts
+++ b/src/structure/structure.ts
@@ -202,11 +202,13 @@ export abstract class Structure extends Nub {
             );
         }
 
+        this.prms.update_h1h2();
+
         // Gestion du débit nul
         const flagsNull = { ENUM_StructureFlowMode: StructureFlowMode.NULL,
                             ENUM_StructureFlowRegime: StructureFlowRegime.NULL };
         if (sVarCalc === "Q") {
-            if (this.prms.Z1.v <= this.prms.ZDV.v || this.prms.Z1.v === this.prms.Z2.v || this.prms.W.v <= 0) {
+            if (this.prms.h1.v <= 0 || Math.abs(this.prms.h1.v - this.prms.h2.v) < 1E-20 || this.prms.W.v <= 1E-20) {
                 return new Result(0, this, flagsNull);
             }
         } else if (this.prms.Q.v === 0) {
@@ -234,7 +236,7 @@ export abstract class Structure extends Nub {
                 let rPrm: number;
                 switch (sVarCalc) {
                     case "ZDV":
-                        rPrm = Infinity;
+                        rPrm = Math.max(this.prms.Z1.v, this.prms.Z2.v);
                         break;
                     default:
                         rPrm = 0;
diff --git a/src/structure/structure_orifice_submerged_params.ts b/src/structure/structure_orifice_submerged_params.ts
index 68b0fc8ce2eef16034c0bcdc38eb38daaebd6a02..12e69efb48fc319db8ce38fa8a9f5e0ece6a9436 100644
--- a/src/structure/structure_orifice_submerged_params.ts
+++ b/src/structure/structure_orifice_submerged_params.ts
@@ -23,7 +23,7 @@ export class StructureOrificeSubmergedParams extends StructureParams {
      * @param rS    Surface de l'orifice (m2)
      */
     constructor(rQ: number, rZ1: number, rZ2: number, rCd: number, rS: number) {
-        super(rQ, -Infinity, rZ1, rZ2);
+        super(rQ, 100, rZ1, rZ2);
         this.S = new ParamDefinition(this, "S", ParamDomainValue.POS_NULL, rS);
         this.addParamDefinition(this.S);
         this.Cd = new ParamDefinition(this, "Cd", ParamDomainValue.POS_NULL, rCd);