What are regulations on range of survey and scale of inland waterway topographic map in Vietnam?

Pursuant to Article 5 of the Circular 36/2021/TT-BGTVT (takes effect from 01/03/2022) stipulating range of survey and scale of inland waterway topographic map in Vietnam as follows:

- Range of inland waterway survey

+ Regular inland waterway survey shall be conducted within the waterway (based on the centerline of the waterway) and shoals mentioned under inland waterway management dossiers;

+ Periodic inland waterway survey shall be conducted within the width of inland waterway and both sides of inland waterway protective corridor towards the bank of the river, channel, canal, lagoon, gulf;

+ Irregular inland waterway survey shall be conducted in the area where the irregularity occurs within the inland waterway and protective corridor of inland waterway. In case of any irregularity that creates new inland waterway, surveying width shall not exceed 3 times the width of the new waterway and not exceed the bank of the river, channel, canal, lagoon, gulf. Length of survey shall be the length of the new inland waterway.

- Scale of inland waterway survey topographic map

+ Scales of topographic map serving the purpose of inland waterway survey consists of 1:1.000; 1:2.000 and 1:5.000;

+ Topographic map scale of 1:1.000 applies to irregular inland waterway survey. In case an irregularity creates a new inland waterway, scale of topographic map depending on surveying width shall comply with Point c, Point d, and Point dd of this Clause;

+ Topographic map scale of 1:1.000 applies to up to 50 m of surveying width;

+ Topographic map of 1:2.000 applies to surveying width that ranges from more than 50 m to 300 m;

+ Topographic map scale of 1:5.000 applies to surveying width of more than 300 m

Best regards!