The area is based on the “footprint” of the roof, which can be calculated by finding the area of the building and adding the area of the roof’s overhang. A catchment has an area of 150 ha and a runoff/rainfall ratio of 0.40.If due to a 10 cm rainfall over the catchment a stream flow at the catchment outlet lasts for 10 h, the average stream flow in the period is GE2229 WATER AND THE ENVIRONMENT River Basin Formula method, and the SCS Dimensionless Unit Hydrograph for an excess rainfall of 1 cm. Hydrology -Collection of formulas- (Aid for the Exam and the Assignments) Zurich, 2011. The upper reaches of the Cauvery River lie within the Nilgiri and Anaimalai … Please read our short guide how to send a book to Kindle. If you are using the roof of a building for this purpose, calculate the square footage of this area by taking the length of the building, including the overhang(s) and multiply this by the width measurement plus the overhang(s) of the building. Classification of Catchment Areas 6. Watershed Leakage 5. The interactions between hydrology and hydraulics (e.g. Hydrologic Processes Time-area method is based on the concept of time-area histogram, i.e. Catchment Area [raster]

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