Considerations for channel tracing

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2015-04-30 15.59.44No, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no. no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no,

First of all, it is important to collect as much basic engineering information as you can access, as they are:

nn

    nt

  • Topography plans

    • nt

  • Satellite images

    • nt

  • Geological studies, salinity, soils and other important information

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When we already have such information we must proceed to the work of cabinet, where we must carry out a preliminary stroke, which must then be reconsidered on the ground, to make the adjustments that may be necessary. In this way we will be able to arrive at a definitive trace of a channel.

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If we cannot have topographical information of the site, it is advisable to follow the following instructions:

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    nt

  1. Ground recognition: You must go through the area and write down all the details that may be necessary, (details that influence the probable axis of channel layout) georeference the start and end of the channel

    2. nt

  2. Preliminary stroke: A topographical survey is carried out, tracing with stakes mainly the preliminary polygonal and then a survey must be carried out to level that polygonal to make a cross section survey. In high relief terrain sections are recommended every 5 [m] and on more homogeneous terrains is recommended every 20 [m].

    3. nt

  3. The definitive layout is performed. Depending on the scale of the topography of the place:

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For land with cross slope greater than 25%, it is recommended 1:500

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For land with cross slope less than 25% it is recommended 1:1000 to 1:2000

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Source: MANUAL – HYDRAULICAL WORKS DESIGN CRITERIA FOR MULTISECTORIAL HYDRAULICAL AND HYDRO-AFFAZING FORMULATION.

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