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Environmental issue has been considered more significant in many aspects of engineering deci- sion-making process particularly in river management. There is an increasing effort to conserve functioning of rivers for human use as well as nature, therefore environmental flow assessment has been widely developed. This paper discusses on environmental flow assessment of the Sekam- pung River, particularly on its middle reach. A new analytical approach based on water-sediment equations was introduced in order to determine a minimum environmental flow at the certain cross section of a river. The result of the new method was then compared with a minimum envi- ronmental flow provided by using two hydrological based methods, namely, Tennant and Flow Duration Curve Analysis (FDCA) method. The result shows that the concerned discharge provided by the water-sediment method (3.5 m 3 /s) is the smallest compare with a minimum environmental flow that is provided by both Tennant (5.7 m 3 /s) and FDCA method (4.5 m 3 /s). It is promising that the water-sediment method can be used as a simple approach on preliminary state of environ- mental flow assessment. The method involves not only water discharge but also its related sedi- ment flow of the river in order to mitigate further ecological and morphological risks.

Environmental Flow Assessment Using Water-Sediment Approach at the Sekampung River, Indonesia