Creation of the Municipal Districts

Section 5, Article IV of the Comprehensive Zoning Ordinance of the Municipality of Rosario, Batangas, as adopted through Municipal Ordinance No. 574, Series of 2020, dated December 7, 2020, provides as follows: 

"Section 5.   Division into Zones or Sub-Zones

To effectively carry out the provisions of this Ordinance, the municipality is hereby divided into four (4) Municipal Districts derived from its subwatershed boundaries as follows:

01. The South East Municipal District (Rosario River Subwatershed);

02. The East Municipal District (Lawaye River Subwatershed);

03. The North East Municipal District (Malaquing Ilog River Subwatershed); and 

04. The West Municipal District (Calumpang River Subwatershed)."

Watershed Delineation

For the subwatershed delineation of the municipality, several approaches were used. First, original DEM data from ASTER GDEM was processed using SAGA GIS 2.1.2 Terrain Analysis to generate the watershed basins. ASTER GDEM is the property of METI and NASA. To further refine the delineation, the rivers and creeks network of the municipality extracted from the Cadastral Survey CAD-426-D for the Municipality of Rosario, Batangas was overlaid to the watershed basins generated. Finally, where the watershed divide falls within the barangay, the barangay shall be construed to be within the subwatershed where the major portion of the barangay is located. For convenience, where the barangay is not contiguous to its subwatershed because of political boundary (e.g. municipal boundary), it is assigned to the adjacent subwatershed within the municipality.

Terrain Analysis using ASTER GDEM data, Cadastral Maps CAD-426-D and NAMRIA Topographic Maps suggest there are at least four major subwatersheds or sub-river basins in the municipality. These are: the Malaquing Ilog Subwatershed and the Lawaye River Subwatershed to the east; the Rosario River Subwatershed to the south; and the Calumpang River Subwatershed to the west.

The following barangays fall along the watershed divide from north to south: Quilib, San Jose, Tiquiwan, Lumbangan, Cahigam and Mayuro.  Barangays Cahigam and Mayuro were assigned the Calumpang River Subwatershed because major portions of these barangays are within the said subwatershed. 

Barangay Quilib was found to be not contiguous to its indicated subwatershed obtained by terrain analysis. However, it is assigned to the Calumpang River Subwatershed because at least 3 creeks pass through it that drain to the Calumpang River Subwatershed. 

Barangays San Jose, Tiquiwan and Lumbangan were assigned the Malaquing Ilog Subwatershed because major portions of these barangays are within the said subwatershed.

References:

1. COMPREHENSIVE LAND USE PLAN AND ZONING ORDINANCE: 2016-2030 VOLUME 1 - THE COMPREHENSIVE LAND USE PLAN 6.1 with PLUC Comments Adopted

2. COMPREHENSIVE LAND USE PLAN AND ZONING ORDINANCE: 2016-2030 VOLUME 2 - ZONING ORDINANCE Version 6.1 with PLUC Comments Adopted

3. COMPREHENSIVE LAND USE PLAN AND ZONING ORDINANCE: 2016-2030 VOLUME 3 - THE SECTORAL AND SPECIAL AREA STUDIES, Version 6.5 with PLUC Comments Adopted