diff --git a/spec/macrorugo/concentration_blocs.spec.ts b/spec/macrorugo/concentration_blocs.spec.ts
index 8bdf8fa20a0ffe1d3a680310ed317f87e4ed6a3d..efe34000464f0ec81f7907bdac9a2328fbc1e71e 100644
--- a/spec/macrorugo/concentration_blocs.spec.ts
+++ b/spec/macrorugo/concentration_blocs.spec.ts
@@ -18,7 +18,7 @@ describe("Class ConcentrationBlocs − ", () => {
     });
 
     it("calc C", () => {
-        nub.prms.C.singleValue = 666;
+        nub.prms.C.singleValue = 1;
         nub.prms.C.setCalculated();
         const res = nub.CalcSerie();
         expect(res.vCalc).toBeCloseTo(0.49, 2);
@@ -26,7 +26,7 @@ describe("Class ConcentrationBlocs − ", () => {
     });
 
     it("calc C, round N", () => {
-        nub.prms.C.singleValue = 666;
+        nub.prms.C.singleValue = 1;
         nub.prms.N.singleValue = 9.89;
         nub.prms.C.setCalculated();
         const res = nub.CalcSerie();
@@ -85,7 +85,7 @@ describe("Class ConcentrationBlocs − ", () => {
     });
 
     it("calc D", () => {
-        nub.prms.D.singleValue = 666;
+        nub.prms.D.singleValue = 2;
         nub.prms.D.setCalculated();
         const res = nub.CalcSerie();
         expect(res.vCalc).toBeCloseTo(0.35, 2);
diff --git a/spec/pab/pab_jalhyd131.spec.ts b/spec/pab/pab_jalhyd131.spec.ts
index 280a02ad1eed83dbd0dd48d5bfa5ec1158cf3a86..9d356530d57c16a2a07268f95c2743626c8d3355 100644
--- a/spec/pab/pab_jalhyd131.spec.ts
+++ b/spec/pab/pab_jalhyd131.spec.ts
@@ -51,7 +51,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 215219.392
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -71,12 +71,12 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "alpha2",
                                         "mode": "SINGLE",
-                                        "value": 547480.854
+                                        "value": 90
                                     },
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 695727.833
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -101,7 +101,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWR",
                                         "mode": "SINGLE",
-                                        "value": 471832.179
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -166,7 +166,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 72612.054
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -221,7 +221,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdO",
                                         "mode": "SINGLE",
-                                        "value": 254975.526
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -246,7 +246,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWSL",
                                         "mode": "SINGLE",
-                                        "value": 143157.249
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -271,7 +271,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWR",
                                         "mode": "SINGLE",
-                                        "value": 119796.263
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -326,12 +326,12 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "alpha2",
                                         "mode": "SINGLE",
-                                        "value": 844538.962
+                                        "value": 90
                                     },
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 657719.871
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -386,7 +386,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdO",
                                         "mode": "SINGLE",
-                                        "value": 396113.123
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -406,12 +406,12 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "alpha2",
                                         "mode": "SINGLE",
-                                        "value": 381441.611
+                                        "value": 90
                                     },
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 629687.001
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -436,7 +436,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWR",
                                         "mode": "SINGLE",
-                                        "value": 410711.955
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -491,12 +491,12 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "alpha2",
                                         "mode": "SINGLE",
-                                        "value": 12030.035
+                                        "value": 90
                                     },
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 54831.623
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -516,7 +516,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdO",
                                         "mode": "SINGLE",
-                                        "value": 919858.034
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -576,7 +576,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWR",
                                         "mode": "SINGLE",
-                                        "value": 69976.261
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -601,7 +601,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWSL",
                                         "mode": "SINGLE",
-                                        "value": 524111.51
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -656,7 +656,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdO",
                                         "mode": "SINGLE",
-                                        "value": 769223.09
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -681,7 +681,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWSL",
                                         "mode": "SINGLE",
-                                        "value": 184926.268
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -701,12 +701,12 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "alpha2",
                                         "mode": "SINGLE",
-                                        "value": 520326.61
+                                        "value": 90
                                     },
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 516359.934
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -761,7 +761,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdO",
                                         "mode": "SINGLE",
-                                        "value": 464769.605
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -821,7 +821,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWR",
                                         "mode": "SINGLE",
-                                        "value": 706623.422
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -841,12 +841,12 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "alpha2",
                                         "mode": "SINGLE",
-                                        "value": 325309.763
+                                        "value": 90
                                     },
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 816772.664
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -866,12 +866,12 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "alpha2",
                                         "mode": "SINGLE",
-                                        "value": 418326.307
+                                        "value": 90
                                     },
                                     {
                                         "symbol": "CdT",
                                         "mode": "SINGLE",
-                                        "value": 608510.929
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -931,7 +931,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWSL",
                                         "mode": "SINGLE",
-                                        "value": 235453.03
+                                        "value": 10
                                     }
                                 ]
                             },
@@ -956,7 +956,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdWR",
                                         "mode": "SINGLE",
-                                        "value": 900438.187
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -1011,7 +1011,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdO",
                                         "mode": "SINGLE",
-                                        "value": 700902.051
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -1066,7 +1066,7 @@ function getPabJalhyd131(): Pab {
                                     {
                                         "symbol": "CdO",
                                         "mode": "SINGLE",
-                                        "value": 160953.984
+                                        "value": 10
                                     }
                                 ]
                             }
@@ -1148,7 +1148,7 @@ function getPabJalhyd131(): Pab {
                                 {
                                     "symbol": "CdWR",
                                     "mode": "SINGLE",
-                                    "value": 391320.536
+                                    "value": 10
                                 }
                             ]
                         },
@@ -1168,7 +1168,7 @@ function getPabJalhyd131(): Pab {
                                 {
                                     "symbol": "CdWR",
                                     "mode": "SINGLE",
-                                    "value": 114113.602
+                                    "value": 10
                                 },
                                 {
                                     "symbol": "minZDV",
@@ -1203,7 +1203,7 @@ function getPabJalhyd131(): Pab {
                                 {
                                     "symbol": "CdO",
                                     "mode": "SINGLE",
-                                    "value": 715404.326
+                                    "value": 10
                                 }
                             ]
                         }
diff --git a/spec/structure/dever_jalhyd123.spec.ts b/spec/structure/dever_jalhyd123.spec.ts
index 693c7ffc8ed29b6fb9e311cca5274ecf1ccfc626..ab0979408d2ff9ee849c75bd0254a759ebf33498 100644
--- a/spec/structure/dever_jalhyd123.spec.ts
+++ b/spec/structure/dever_jalhyd123.spec.ts
@@ -5,7 +5,7 @@ describe("Dever", () => {
     describe("jalhyd#123", () => {
         it("1-CalcSerie() should return consistent result with no NaN or Infinity", () => {
             // tslint:disable-next-line:max-line-length
-            const sessionJson = `{"header":{"source":"jalhyd","format_version":"1.1","created":"2019-08-02T13:08:02.502Z"},"session":[{"uid":"ZTVndH","props":{"calcType":"Dever"},"children":[{"uid":"YWdpdz","props":{"calcType":"Structure","loiDebit":"TriangularTruncWeirFree"},"children":[],"parameters":[{"symbol":"ZDV","mode":"SINGLE","value":435224.52874659264},{"symbol":"BT","mode":"SINGLE","value":834000.9388248117},{"symbol":"ZT","mode":"SINGLE","value":122035.3210189593},{"symbol":"CdT","mode":"SINGLE","value":373098.1230344667}]}],"parameters":[{"symbol":"Q","mode":"CALCUL"},{"symbol":"Z1","mode":"SINGLE", "value": 435224.52874657186},{"symbol":"BR","mode":"SINGLE","value":377590.4669003834},{"symbol":"ZR","mode":"SINGLE","value":1783112.6327096}]}]}`;
+            const sessionJson = `{ "header": { "source": "jalhyd", "format_version": "1.1", "created": "2019-08-02T13:08:02.502Z" }, "session": [ { "uid": "ZTVndH", "props": { "calcType": "Dever" }, "children": [ { "uid": "YWdpdz", "props": { "calcType": "Structure", "loiDebit": "TriangularTruncWeirFree" }, "children": [], "parameters": [ { "symbol": "ZDV", "mode": "SINGLE", "value": 435224.52874659264 }, { "symbol": "BT", "mode": "SINGLE", "value": 834000.9388248117 }, { "symbol": "ZT", "mode": "SINGLE", "value": 122035.3210189593 }, { "symbol": "CdT", "mode": "SINGLE", "value": 10 } ] } ], "parameters": [ { "symbol": "Q", "mode": "CALCUL" }, { "symbol": "Z1", "mode": "SINGLE", "value": 435224.52874657186 }, { "symbol": "BR", "mode": "SINGLE", "value": 377590.4669003834 }, { "symbol": "ZR", "mode": "SINGLE", "value": 1783112.6327096 } ] } ] }`;
             Session.getInstance().unserialise(sessionJson);
             const nub = Session.getInstance().findNubByUid("ZTVndH");
             nub.CalcSerie();
diff --git a/src/open-channel/remous_params.ts b/src/open-channel/remous_params.ts
index a34b7ac5c812c2f36e986185212e0f801208d99a..3f3ff119f29f623155dac9b2c33f9d1d7d9b25a0 100644
--- a/src/open-channel/remous_params.ts
+++ b/src/open-channel/remous_params.ts
@@ -89,9 +89,9 @@ export class CourbeRemousParams extends ParamsEquation {
      * durant le calcul
      */
     public setYamontYavalFromElevations() {
-        this._Yamont.singleValue = (this._Z1.v - this._ZF1.v);
+        this._Yamont.singleValue = Math.max(1e-12, (this._Z1.v - this._ZF1.v));
         this._Yamont.v = this._Yamont.singleValue;
-        this._Yaval.singleValue = (this._Z2.v - this._ZF2.v);
+        this._Yaval.singleValue = Math.max(1e-12, (this._Z2.v - this._ZF2.v));
         this._Yaval.v = this._Yaval.singleValue;
     }
 }
diff --git a/src/param/param-definition.ts b/src/param/param-definition.ts
index e6bb41292a943f4e50a76249f426e1350453fd6b..223444b3af1960d81adc1fd6e42acf87499e7736 100644
--- a/src/param/param-definition.ts
+++ b/src/param/param-definition.ts
@@ -435,6 +435,7 @@ export class ParamDefinition implements INamedIterableValues, IObservable {
 
     public set singleValue(v: number) {
         this.checkValueMode([ParamValueMode.SINGLE, ParamValueMode.CALCUL, ParamValueMode.LINK]);
+        this.checkValueAgainstDomain(v);
         this.paramValues.singleValue = v;
         this.initValue = v;
         this.notifyValueModified(this);