Abstract
For Engineers involved in planning and construction of water resources building, hydrology becomes very important data. In terms of planning stage in water resources especially waterworks, it is known that design flood discharge closed to field realistic conditions is often needed in order that a planned construction is able to control flood discharge. Several previous researches in choosing flood discharge selection method have diverse depending on observed watershed. One method in determining selected flood discharge by verification using Creager diagram, by comparing discharge calculation results of several Synthetic Unit Hydrograph (SUH) with infrastructure flood discharge (AWLR result) in observation point. This research aims to obtain the most suitable synthetic unit hydrograph and close to analysis result of measured discharge frequency, and Creager diagram in Kelara watershed (DAS). Based on the calculation of design flood discharge according to rainfall data using synthetic unit hydrograph of Nakayasu, ITB I, ITB II, and SCS (HEC-HMS) as well as the calculation of design flood discharge according to collected data, it is concluded that the synthetic unit hydrograph method closest to design flood discharge with measured discharge rate and Q1000 rate of Creager diagram is SCS. Flood discharge rate obtained according to HSS SCS method using HEC-HMS 4.8 application in period of 2 years is 658,40 m3/s, 25 years is 682,70 m3/s, 50 years is 787,00 m3/s, 100 years is 885,70 m3/det, and 1000 years is 1202,60 m3/s
Highlights
IntroductionRiver functions to contain rainfall and flows it to the sea
In terms of hydrology, river functions to contain rainfall and flows it to the sea
Critical data required in hydrological analysis are topographyy, rainfall rate, land use pattern, type of soil and the data collected from measured observations including water level and discharge rate of a watershed [2]
Summary
River functions to contain rainfall and flows it to the sea. An area where river first get the rainfall water is rain catchment area known as Watershed (DAS). It is so that Watershed can be seen as a unitary unit of rainfall area becoming river flow [1]. Critical data required in hydrological analysis are topographyy, rainfall rate, land use pattern, type of soil and the data collected from measured observations including water level and discharge rate of a watershed [2]. If a city is trying to improve or fix a water availability problem, the first step to it for the engineer is to find out a watershed in highlands area and estimate its ability to provide water. Engineers must be able to predict potential flood in the watershed [3]
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