Abstract
Accurate estimation of runoff and sediment yield amount is not only an important task in physiographic but also important for proper watershed management. This paper proposes a seasonal relationship between Soil Conservation Services, runoff curve number (CN) and sediment yield (SY). Short-term sediment yield value of duration range from 1 to 30 day was correlated with the runoff CN derived for the respective duration from observed rainfall–runoff data. It is derived empirically from short-term (10 years) daily rainfall–runoff data of the Shakkar watershed of Narmada Basin falling in Madhya Pradesh (India). The resulting coefficient of determination (R2) values range (0.76–0.79) strongly support the versatility of the derived relationship and invokes determination of SY from the available National Engineering Handbook (NEH-4) CN values.
Highlights
This paper proposes a seasonal relationship between Soil Conservation Services, runoff curve number (CN) and sediment yield (SY)
Information on sediment yield from a catchment is very often required for planning, designing and evaluation of soil conservation projects, design and operation of reservoirs, environmental and water pollution control measures, and drought and flood control programs
Mathematical and physical justification of SY–CN rationale invokes the existence of a relationship between the duration-dependent SY and runoff curve numbers
Summary
Information on sediment yield from a catchment is very often required for planning, designing and evaluation of soil conservation projects, design and operation of reservoirs, environmental and water pollution control measures, and drought and flood control programs. The need for accurate information on watershed runoff and sediment yield has grown rapidly during the past decades because of the acceleration of watershed management programs for conservation, development, and beneficial use of all natural resources, including soil and water (Gajbhiye and Mishra 2012; Mishra et al 2013). Many empirical statistical models were established, their involving in factors was not same. Foreign statistical models such as USLE (Wischmeier and Smith 1978) and RUSLE (Renard et al 1991), in which sediment yield rules and mechanism in different scales were not better presented
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