Table of Contents

Volume 24. Sub-Basin ...... 3 Geographic Location ...... 3 Political and Administrative Boundary ...... 4 Land Cover ...... 5 Sub-basin Characterization and Properties...... 7 Drainage Network / Properties ...... 7 Sub-sub basin Properties ...... 9 Water Quantity ...... 10 Water Balance ...... 10

LIST OF FIGURES Figure 24-1 Geographical Map of the Taguig Sub-basin ...... 3 Figure 24-2 Political Map of Taguig Sub-basin ...... 5 Figure 24-3 Land Cover Map of TaguigSub-basin ...... 6 Figure 24-4 Drainage Map of the Taguig Sub-basin ...... 8 Figure 24-5 Sub-sub basin Map of Taguig Sub-basin ...... 9 Figure 24-6 Water Balances based on model simulation, 1990-2004 ...... 11

LIST OF TABLES Table 24-1 Geographic Extent of Taguig Sub-basin ...... 4 Table 24-2 and Barangays Covered by Taguig Sub-basin ...... 4 Table 24-3 PopulationDistribution by , 2007 ...... 4 Table 24-4 Area Distribution of Land Cover in Taguig Sub-basin ...... 6 Table 24-5 Some Relief Features and Other Geo-Morphological Parameters ...... 7 Table 24-6 Taguig Sub-sub basin properties ...... 10 Table 24-7 Yearly Water Balances based on model simulation (mm) ...... 10

Technical writer Mr. Manuel V. Quinto

Technical editors Ms. Adelina C. Santos-Borja Engr. Emiterio C. Hernandez Officer-In-Charge Officer- In Charge Resource Management and Development Officer Project Development Management and Evaluation Division

Map production Mr. Neil V. Varcas

Volume 24. Taguig Sub-Basin

Geographic Location The Taguig Sub-basin located in the northwestern part of the de Bay spread over the cities of , , and Taguig and the municipalities of , , and Taytay. The total area of the sub-basin is about 4,596.741hectares, a big part of which (48.74%) is within the territorial jurisdiction of Taguig City followed by the City of Pasig at 26.77%. The coordinates of the sub- basin is shown in Table 24-1 while the satellite image is illustrated in Figure 24-1. However, Makati City is not within the territorial jurisdiction of LLDA.

Source: LLDA PDMED Figure 24-1 Geographical Map of the Taguig Sub-basin

Table 24-1 Geographic Extent of Taguig Sub-basin CORNERS NORTHING (UTM) EASTING (UTM) Upper Left 1604069.87500 298342.40625 Upper Right 1604069.87500 288892.71197 Lower Right 1614439.00000 288892.71197 Lower Left 1614439.00000 298342.40625

Political and Administrative Boundary

The sub-basin is politically and administratively composed of 6 cities and municipalities located in the cities of Makati Taguig, Pasig, Pateros in Metro and Angono and Taytay in . In addition, the sub-basin has a total of 56 barangays (Table 24-2). Figure 24-2 illustrates the political map of the sub-basin which also shows the distribution.

Table 24-2 Municipalities and Barangays Covered by Taguig Sub-basin MUNICIPALITY / CITY NO. OF BARANGAYS AREA (HA) PERCENTAGE (%) Angono 1 17.461 .38 Makati 7 299.423 6.51 Pasig City 19 1230.462 26.77 Pateros 10 183.916 4.00 Taguig City 15 2240.376 48.74 Taytay 4 625.103 13.60 TOTAL 56 4596.741 100 National Statistics Office, 2007 Census of Population

The Taguig Sub-basin has a total population of 822,562 inhabitants based on 2007 NSO census. 85% or 699,511 come from the Cities of Pasig and Taguig. The average annual growth rate within the sub-basin is 2.82%. Table 24-3 shows the detailed population data of each municipalities as well as the annual growth rate.

Table 24-3 PopulationDistribution by Municipality, 2007 CITY/MUNICIPALITY POPULATION ANNUAL GROWTH RATE (%) Angono 20,578 2.49 Taytay 45,672 3.95 Pasig City 238,278 2.81 Pateros 56,798 1.05 Taguig City 461,233 3.81 TOTAL 822,562 National Statistics Office, 2007 Census of Population

Source: LLDA GIS

Figure 24-2 Political Map of Taguig Sub-basin

Land Cover

The Taguigsub-basin is basically classified as urban, marshy, grass, water, and arable (Table 24- 4). Almost the entire sub-basin (84%) is classified as urban or highly built-up area such as residential, commercial and industrial use (Figure 24-3).

The arable areas are mostly found in Taguig City (parts of Barangays Hagonoy, Bambang, Ususan, Calzada, LigidTipas, Palingon, Sta. Ana, , and ), Pateros (parts of Barangays San Roque and Santa Ana. Most of the grasslands are found in parts of Barangays Hagonoy, Wawa, Palingon, Napindan, and Ibayo-Tipas in Taguig City.

Table 24-4 Area Distribution of Land Cover in Taguig Sub-basin LAND COVER AREA (ha) PERCENTAGE (%) Arable 94.824 2% Grass 145.438 3% Marsh 173.951 4% Urban 3958.001 87% Unclass 2.712 0% Water 165.932 4% TOTAL 4540.858 100% Source: LLDA GIS

Source: LLDA GIS Figure 24-3 Land Cover Map of TaguigSub-basin

Sub-basin Characterization and Properties

Drainage Network / Properties

The drainage map of the Taguig Sub-basin is shown in Figure 24-4 while the important watershed characteristics and geomorphological features are in Table 24-5.

Table 24-5 Some Relief Features and Other Geo-Morphological Parameters PARAMETERS VALUES

Area (ha) 4537.585 Perimeter (m) 36071.932 Total number of streams 35 Total length of streams (m) 35543.015 Stream Density (stream/ha) 0.0077 Drainage Density (m/ha) 7.8330 Constance of Channel Maintenance (ha/m) 0.1277 Length of Overland Flow (m) 3.9165

Source: LLDA GIS

Source: LLDA GIS

Figure 24-4 Drainage Map of the Taguig Sub-basin

Sub-sub basin Properties

Source: LLDA GIS Figure 24-5 Sub-sub basin Map of Taguig Sub-basin

Table 24-6 Taguig Sub-sub basin properties SUB-SUB BASIN NAME AREA (Ha) PERIMETER (m) SSB-24A 312.753 13112.417 SSB-24B 427.886 10553.933 SSB-24C 1008.513 21603.160 SSB-24D 1470.164 23742.811 SSB-24E 199.999 6093.295 SSB-24F 156.847 6007.135 SSB-24G 785.101 14396.381 SSB-24H 175.474 7031.794 Source: LLDA GIS

Water Quantity

Water Balance

The Sacramento Soil Moisture Accounting (SAC SMA) Hydrologic Model is used to simulate watershed rainfall-runoff relationship and to generate the long-term water balance of the 24 sub- basins of . The SAC SMA accounts for all water entering, stored in, and leaving a drainage basin. Though many parameters are used in this water balance accounting process, has the main impact on runoff.

The 15-year rainfall data simulation shows that on the average, 56.8% of total rainfall goes to direct run off, while 31% is lost to evapotranspiration. (Figure 24-9).

Table 24-7 Yearly Water Balances based on model simulation (mm) ACTUAL EVAPO- DIRECT CHANGE IN YEAR RAINFALL BASEFLOW TRANSPIRATION RUNOFF STORAGE 1990 2,249 702 1,297 387 (136) 1991 2,293 609 1,485 221 (23) 1992 2,369 618 1,445 237 68 1993 1,813 511 926 237 138 1994 2,094 671 1,263 271 (110) 1995 2,006 580 1,024 245 157 1996 1,271 636 548 177 (90) 1997 657 554 162 82 (141) 1998 801 375 256 42 129 1999 1,752 601 931 97 123 2000 2,734 751 1,723 280 (19) 2001 2,506 703 1,444 278 82 2002 2,628 749 1,569 283 28 2003 3,053 646 2,052 318 38 2004 2,016 674 1,056 263 22 AVERAGE 2,016 625 1,145 228 18 Source: LLDA PDMED

Figure 24-6 Water Balances based on model simulation, 1990-2004