Final mandatory injunctions and res judicata bar fresh impeachment of a decree without a material legal change

A final mandatory injunction cannot be impeached or modified merely on asserted changed circumstances unless the legal basis of the decree has materially changed. The plaint challenging the earlier decree was also liable to rejection because it disclosed no legally cognisable cause of action under Article 131 and was barred by res judicata, including the effect of an earlier unconditional withdrawal. The challenge to the water dispute provision failed on similar threshold grounds, with the pleadings not showing prima facie constitutional invalidity. A final decree remains binding despite later litigation, and the Court may direct practical modes of implementation, including completion of the canal through a central agency.

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Issues: (i) whether the plaint filed by Punjab to discharge and impeach the decree in the earlier suit disclosed any cause of action under Article 131 and was barred by law, including res judicata and withdrawal of the earlier challenge to Section 78 of the Punjab Reorganisation Act, 1966; (ii) whether the challenge to Section 14 of the Inter-State Water Disputes Act, 1956 was maintainable; and (iii) whether Haryana was entitled to enforcement of the decree dated 15 January 2002 and ancillary directions for its implementation.

Issue (i): whether the plaint filed by Punjab to discharge and impeach the decree in the earlier suit disclosed any cause of action under Article 131 and was barred by law, including res judicata and withdrawal of the earlier challenge to Section 78 of the Punjab Reorganisation Act, 1966.

Analysis: A suit under Article 131 must disclose a dispute involving a legal right. A plaint that ex facie does not show a legal ground to seek modification of a decree can be rejected under the Supreme Court Rules. The Court held that the decree dated 15 January 2002 granted a final mandatory injunction and was not a continuing preventive injunction capable of prospective modification on changed circumstances. The grounds pleaded by Punjab, including pendency of a water dispute, alleged non-implementation of the Punjab Settlement, and alleged constitutional infirmity of the earlier decree, did not amount to a legally cognizable change in the basis of the decree. The challenge to Section 78 was also barred because the same issue had earlier been raised and the earlier suit had been withdrawn unconditionally, attracting the rule against bringing a fresh suit on the same subject-matter.

Conclusion: The plaint disclosed no maintainable cause of action for modifying or discharging the decree and was barred in law.

Issue (ii): whether the challenge to Section 14 of the Inter-State Water Disputes Act, 1956 was maintainable.

Analysis: The Court held that the challenge was barred by res judicata because the validity and effect of Section 14 had already been considered in the earlier proceedings. Independently, the plaint did not plead legally sustainable grounds for constitutional invalidity. Mere assertions of legislative incompetence or discrimination, without prima facie supporting grounds, were insufficient. The plea that the provision had become redundant or was based on an allegedly invalid settlement was not a recognised basis for striking down legislation.

Conclusion: The challenge to Section 14 failed and was liable to be rejected at the threshold.

Issue (iii): whether Haryana was entitled to enforcement of the decree dated 15 January 2002 and ancillary directions for its implementation.

Analysis: The decree was final and binding, and the mere filing of later proceedings did not suspend its operation. The Court held that the objections based on pending litigation, alleged political fallout, or alleged nullity of the decree were untenable. Under the Supreme Court (Decrees and Orders) Enforcement Order, 1954, read with the Court's powers to enforce decrees, the Court could direct a mode of implementation suitable to the relief granted. Since Punjab had not complied with the decree and the Union of India had not completed the canal, directions for transfer of the works to a central agency and for completion within a fixed time were justified.

Conclusion: Haryana was entitled to enforcement of the decree and to ancillary implementation directions.

Final Conclusion: The Punjab suit was rejected and dismissed, while Haryana's enforcement application was allowed with directions for completion of the canal through a central agency.

Ratio Decidendi: A final mandatory injunction is not open to impeachment or modification merely on asserted changed circumstances unless the legal basis of the decree itself has materially changed, and a plaint that ex facie shows no legal right or is barred by res judicata or prior withdrawal is liable to be rejected under the Supreme Court Rules.

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