Municipal District

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)."

South East Municipal District

Rosario River Subwatershed (Southeastern Municipal District) consist of only 5 barangays yet it occupies over 25% of the total land area of the municipality, resulting to a sparsely populated settlement. Headwaters of several perennial rivers are also found in these subwatersheds.

East Municipal District

Similarly, the Lawaye River Subwatershed (Eastern Municipal District) consists of only 5 barangays but it comprises a fifth of the total land area of the municipality. The sizes in terms of land area of barangays in these subwatersheds (east and southeast) are evidently larger than the other two subwatersheds (west and northeast) . The general topography is hilly land and steep slopes making large portions of the arable land not suitable to residential, commercial nor industrial structures. Moreover, the timberland areas are also found in these subwatersheds.

North East Municipal District

The Malaquing Ilog Subwatershed (Northeastern Municipal District) comprise over a quarter of the total land area of the municipality and 3 out of 10 persons are based in this settlement, with a population density of 635 persons per square kilometer. and ranked 2nd to Calumpang River Subwatershed. There are 15 barangays in this Subwatershed. This Subwatershed is traversed over its entire length from east to west by the Rosario-San Juan National Road.

West Municipal District

The Calumpang River Subwatershed (Western Municipal District) is where the population is concentrated making it a high-density settlement with a gross density of 1,123 persons per square kilometer. Over half of the total population is in this Subwatershed covering 27.4% of the total land area and spread in 23 barangays. Most of the urban barangays, including the Poblacion, are situated in this 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:

RHU CAtchments

The RHU Catchment Areas, designated by the Department of Health (DOH), define the geographic zones served by each Rural Health Unit in Rosario, Batangas. 


Municipal Districts

The Municipal Districts, developed through the Watershed Approach to Land Use Planning, organize barangays based on shared natural resource systems such as watersheds. 

Barangay Clusters

The Barangay Clusters, a community organizing strategy introduced in 1995, divide the 48 barangays of Rosario, Batangas into eight clusters, each composed of six barangays. 

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