Estimate of the coefficient of surface drainage "C" using ALOS images of medium resolution in the Hydrographic Unit of Paranoá Lake as an urban environmental planning and management tool

Abstract

Population growth, which often occurs in a disorderly way across Brazil, has undesirable consequences on the urban environment, causing flooding and waterlo gging. Some regions of the Brazilian, including those incorporated in the basin of Lake Paranoá have suffered from such situations in recent years. Based on this scenario, this study aims to estimate the runoff coefficient “C” for the hydrographic unit in question order to partition the study area, according to the use and occupation, an ALOS satellite image was used with medium spatial resolution and the SAM (Spectral Angle Mapper) method was applied. The calculation of “C” was carried out to evaluate two scenarios: first in the basin of Lake Paranoá and second for the area involving only the Administrative Regions ”“ RAs Brasilia (South and North Wings), Cruzeiro and Southwest/Octogonal. The “C” value found for the study area was consistent with the parameters used by New Capital of Brazil Urbanization Company (Novacap), responsible for implementation and maintenance of stormwater systems.