Abstract
Abstract: Various kinds of buildings in civil engineering require careful planning. For example, in the planning of a water building needed a method to calculate the design flood discharge before starting to plan the dimensions of the building to meet the effectiveness of the water structure. Design flood discharge can be determined using several hydrograph methods that have been used in water building planning in Indonesia. One of the popular hydrograph method used is the Nakayasu Synthetic Unit Hydrograph method. In this case, the design flood discharge is located in the Garang watershed, precisely in Semarang City, province of Central Java, using rainfall data for the past 16 years. Hydrological analysis is carried out first before determining the design flood discharge with a return period of 2, 5, 10, 25, and 50 years. The results of the design flood discharge using Nakayasu method respectively were 305,522 m3/s, 390,742 m3/s, 447,783 m3/s, 520,560 m3/s, and 574,912 m3/s.
Highlights
The calculation of design flood discharge is the most important aspect of planning the water structure
Design flood discharge can be calculated using rational methods and several hydrograph methods that previously have been used in the planning of water structures in Indonesia
The method used in this study is Nakayasu Synthetic Unit Hydrograph method
Summary
The calculation of design flood discharge is the most important aspect of planning the water structure. Design flood discharge is a component which is needed to determine the magnitude of peak flow discharge in a Watershed. This flood discharge will be used in calculating the dimensions of water structures such as dams, groundsill, and so on. Design flood discharge can be calculated using rational methods and several hydrograph methods that previously have been used in the planning of water structures in Indonesia. Rain intensity is the level of rainfall per unit of the time, it can be calculated using the Manonobe method which is described as follows [3]: I=. The Nakayasu Synthetic Unit Hydrograph method is the first hydrograph method developed in Japan[5] This method has been applied several times in water structures in East Java.
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