KAJIAN SISTEM DRAINASE KAWASAN PUSAT PERKANTORAN BUKIT PELANGI SANGATTA

Abstract

Flooding problems in the Sangatta city, especially in the central offices of the rainbow
hill that occur almost every year in the rainy season of concern that need to be addressed. This
thesis to analyze the ability of the existing drainage channel (actual) to accommodate surface
runoff and stream flow, condition, shape, construction and the direction of the flow channel in
the area of the floodwaters. Boundary problem in terms of this thesis is a hydrological analysis to
analyze rainfall plans, rainfall intensity and time of concentration, while the analysis of
hydraulics to analyze the ability of existing channels (actual) at a location to be review, namely
the central office of Rainbow Hill Sangatta to accommodate runoff and stream discharge.
The method used of data collection and analysis. The data used are primary data and
secondary data are then analyzed based on the analysis of hydrology and hydraulics analysis and
evaluated based on the actual of the discharge channel with discharge plan.
To determine rainfall plans to use two types of distributions are widely used in the fields
of hydrology, distribution Log Person III and Gumbel distribution, then take of rainfall over the
plan period 2, 5, 10, 25 years. Flood discharge plan is calculated using Rational method and
Nakayasu Synthetic unit hydrograph method.
From the calculation of flood discharge on the actual channel with the largest channel
dimensions b = 0.65 m and h = 0.70 m when compared with the discharge plan flood return
period of 25 years there are some channels that don’t meet so necessary to change the
dimensions of the channel becomes b = 0.8 m and h = 1 m.