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ABSTRACT
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This research has focused on the hydrological study in the upper Ligeiro river watersherd,
located in the southwestern region of the State of Paraná, in the Pato Branco City,
morphometry study of watershed, water quality, the peak flood and model remain curve. The
methodology is based confection mapping, with the maps thematic of altitude, drainage and
land use, by 1980 and 2008 survey historical occupation of the watershed. Collected
superficial water sample for rating of water quality and field survey for visualization of
Ligeiro river environmental conditions. Model remain curve staying followed the procedures
defined by the project HG-52 from Central hydraulics and Hydrology Professor Parigot de
Souza and obtaining the ability of soil saturation as the peak flow by method applied curve
number (CN) developed by SCS (Soil Conservation Service) and empirical equation of Ven
Te Chow. The results obtained for morfometric watershed is what presents elongated format,
average elevation of 799 m and order 3. The quality of surface water proved to be outside the
bounds of classification by CONAMA 357/2005 for the values of Biochemical Oxygen
Demand and Chemical Oxygen Demand that ranked water as class 4 for navigation purposes
or landscaping without primary contact. For model remain curve, this presented for Q90% and
Q95% is 6,79 L/s.km² and 4,83 L/s.km², respectively, and considering the area of the watershed
for 68,26 km², the values obtained were: Q90% = 0.464 m³/s and Q95% = 0, 32957 m³/s
minimum to flow. The increase of urbanized areas reflected directly in elevations of peak
flows. Considering the time of the recurrence of 25 years (duration rainwater 0,3 hours), the
peak flow 83,81 m³/s in 1980 to 98,40 m³/s in 2008, and for a recurrence time of 100 years,
125,16 m³/s in 1980 to 151,25 m³/s in 2008.
Key-words: Upper Ligeiro river watershed, Number Curve, Maxims Flow Methods and
Water Quality.