ऐसा वक्र जो किसी कारक जैसे क्षेत्रफल तथा समय के विपरीत खींचे गए विभिन्न कारकों उदाहरणत: वर्षा अपवाह इत्यादि के सभी अधिकतम अथवा न्यूनतम मानों को आवरित कर रहा हो।
A smooth curve covering either all peak values or all trough values of certain quantities e.g. rainfall, runoff etc. plotted against other factors such as area and time.
A smooth curve covering either all peak values or all trough values of certain quantities e.g. rainfall, runoff etc. plotted against other factors such as area and time.
