Example 1: Given below are the ordinates o fa 6-h unit hydrograph for a catchment. Calculatethe ordinates of the DRH due to a rainfall excess of 3.5 cm occurring in 6 h.Time (h)0 3 6 912 15 18 24 30 36 42 48 54 60 69UH ordinate(m³/s)0 25 50 85 125 160 185 160 110 60 36 25168 0 Eхаmple 2:3.0 and 2.0 cm respectively occur successively. The 2-cm ER rain follows the 3-cm rain.The 6-h unit hydrograph for the catchment is the same as given in Example 1. Calculate theresulting DRH.Two storms each of 6-h duration and having rainfall excess values of

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Example 1: Given below are the ordinates o fa 6-h unit hydrograph for a catchment. Calculate the ordinates of the DRH due to a rainfall excess of 3.5 cm occurring in 6 h.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Precipitation

Precipitation forms the basis of the water cycle on the Earth. The air is packed with water molecules in the form of moisture or water vapor. This water vapor usually rises to the atmosphere due to density differences. Precipitation represents any form of water, in liquid form or frozen form that forms in the earth's atmosphere. The water vapor up in the atmosphere condenses due to low temperature and it leads to the formation of clouds. The water vapor that forms clouds on account of condensation, is preferably known as cloud droplet. These cloud droplets when become heavy and can no longer sustain the weight of condensed water droplets, they come to the Earth in the form of rain, snow, ice pellets, and hail. Precipitation patterns, evaporation, and condensation are the three parameters that decide the global water cycle, climate change, and weather. Additionally, smoke and dust particles are equally important parameters for precipitation, as they provide the surface area for the water vapors to get condensed and to form water droplets. So they are known as condensation nuclei. The presence of other pollutants in the air also serves as condensation nuclei. Precipitation always results in the pure water supply to earth, as the salt from the seawater does not evaporate with the water.

Question

Example 1: Given below are the ordinates o fa 6-h unit hydrograph for a catchment. Calculate
the ordinates of the DRH due to a rainfall excess of 3.5 cm occurring in 6 h.
Time (h)
0 3 6 9
12 15 18 24 30 36 42 48 54 60 69
UH ordinate
(m³/s)
0 25 50 85 125 160 185 160 110 60 36 25
16
8 0

Eхаmple 2:
3.0 and 2.0 cm respectively occur successively. The 2-cm ER rain follows the 3-cm rain.
The 6-h unit hydrograph for the catchment is the same as given in Example 1. Calculate the
resulting DRH.
Two storms each of 6-h duration and having rainfall excess values of

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