| Summary: |
The physical characteristics of the watershed is the basic variables that
determine the hydrological processes in the watershed. Making the network of
rivers and watersheds of the manual hardcopy using topographic maps take a long
time and cost a very large, so we need a way to be able to save time and costs. Data
Digital Elevation Model (DEM) is a digital data that describe the geometry of the
shape of the earth's surface or part thereof which consists of a set of points
coordinates of the sampling results. DEM data in this study using data from the Arc
Second SRTM 1, this data is the latest version in which the DEM data has a smaller
pixel size is ± 30m
2
if compared to the previous version is ± 90m
2
.
The purpose of this study was to analyze the physical characteristics of the
watershed Progo using DEM data SRTM 1 Arc Second and software ArcGIS. In
this study, analysis of watershed delineation is obtained from the Watershed
features, while networking or stream flow is obtained from the feature Flow
Accumulation and Stream Order. Additional analysis in this study is a comparison
of elevation data DEM and DEM reconditioning, in order to compare and adjust
the DEM data of the topography in the field.
The difference value 6.0585 km
2
watershed with the percentage of 0.2462%
of the data from the agency. So that the method in this research can be used to
determine the boundary of the watershed. The length of the main river 121.71 km
with a difference in the value of 18.29 km, or 13.0665% of river length of BPDAS
Serayu Opak Progo Progo and the difference of 6.71 km or 5.8348% of the flow of
network data measurement from Badan Informasi Geospasial (BIG). The slope of
the land acquired in Progo watershed area is 15.94%, so it can be categorized quite
steep. Progo watershed land use is dominated by orchards, rice fields and upland
settlements, with a total area reaches 2.294.492.959m
2
. As for the type of soil in the
predominantly volcanic rocks mainly volcanic rocks parcel that reached broad
942.327.488,97m
2
.
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