Normal Flow of Rivers Regulations 1941

GN 255/1941
(Lane III/640) - section 92 - 25 October 1941

In this regulation Parties wishing to have the normal flow of a river fixed shall make their application to the Permanent Secretary stating-

(a) the reasons for which the normal flow should be fixed;
(b) the site or sites at which the normal flow is to be ascertained;
(c) the manner in which they wish to proceed to ascertain the normal flow according to these regulations;
(d) the temporary works if any which are deemed necessary for the purpose and the reasons therefore.

The application shall be accompanied by a plan or plans showing the site or sites at which the normal flow is to be ascertained, the catchment area above each site, the position of all existing dams, canals, pipe lines or conduits taking off from the river or its tributaries above such site or sites, a statement giving the mean annual rainfall in the catchment area above each site and particulars of the records of rainfall in the locality from which the mean annual rainfall has been deduced, and a statement giving the particulars of all grants of water from the river and its tributaries whether permanent or temporary, public or private, made under the laws of Mauritius.

Amended by [GN No. 54 of 1968]

All works which may have been approved by the President as being ,necessary for ascertaining the normal flow and all gaugings and measurements shall be executed under the direction and supervision of the Permanent Secretary.

Amended by [GN No. 61 of 1968]; [Act No. 48 of 1991]

6. The normal flow at any site may be ascertained with reference to the catchment area above the site and the mean annual rainfall over the catchment area. The limits of the catchment area shall be ascertained by inspection or survey and shall be shown on the one inch contour map of the island or other accurate map on a larger scale and its area shall be calculated and expressed in square miles. The normal flow per square mile of catchment area corresponding to any mean annual rainfall shall be taken from the table appended to these regulations. If the mean annual rainfall is the same over the whole catchment area the normal flow at the site shall be the product of the area in square miles by the normal flow per square mile corresponding to the mean annual rainfall over the area. If the mean annual rainfall is different over different parts of the catchment area the normal flow at the site shall be the sum total of the products of the area in square miles of each part of the catchment area by normal flow per square mile corresponding to the mean annual rainfall over that part of the catchment area.

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