Table of Contents

Volume 4. Morong Sub-basin ...... 2 Geographic Location ...... 3 Political and Administrative Boundary ...... 4 Land Cover ...... 5 Sub-basin Characterization and Properties...... 7 Drainage Network ...... 7 Sub-sub basin Properties ...... 9 Water Quantity ...... 10 Stream Flow ...... 10 Water Balance ...... 11

LIST OF FIGURES Figure 4-1 Geographical Map ...... 3 Figure 4-2 Political Boundary Map ...... 5 Figure 4-3 Land Cover Map ...... 6 Figure 4-4 Drainage Map ...... 8 Figure 4-5 Sub-sub basin Map of Morong Sub-basin ...... 9 Figure 4-6 Annual Stream flow, 1990 - 2004 ...... 10 Figure 4-7 Water Balance Percentage, 1990 - 2004 ...... 11

LIST OF TABLES Table 4-1 Geographic extent ...... 4 Table 4-2 Covered Municipalities and Barangays ...... 4 Table 4-3 Land cover and Area ...... 6 Table 4-4 Drainage Properties ...... 7 Table 4-5 Morong Sub sub-basin properties ...... 10 Table 4-6 Yearly Water Balances based on model simulation (mm)...... 11

Technical writer Engr. Erwin Kim P. Mercado, LLDA-PDMED

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, LLDA-PDMED

Volume 4. Morong Sub-basin

Geographic Location The Morong Sub-basin is located north of the central bay of the Laguna Lake. For Morong, it is located at 1240 57’ longitude and at 1400 50’ latitude (LGU-Morong 2002). Teresa, on the other hand, is located at 1240 35’ north longitudes and 1210 12’ east latitude just north of Morong and they share a common boundary. The total land area of the sub-basin is 9,926.531 hectares Table 4-1. The Morong Sub-basin is bounded on the north by the city of Antipolo, to the south by the Central Bay of Laguna Lake, to the east by the municipalities of Baras and Tanay, and the west southwest by Binangonan, Angono and Cardona Figure 4-1.

Source: LLDA GIS Figure 4-1 Geographical Map

Table 4-1 Geographic extent CORNERS NORTHING (UTM) EASTING (UTM) Upper Left 1602844.54934 313433.75000 Upper Right 1602844.54934 304769.37500 Lower Right 1618972.75000 304769.37500 Lower Left 1618972.75000 313433.75000 Source: LLDA GIS

Political and Administrative Boundary Politically, Morong and Teresa belong to the Second District of Rizal along with the municipalities of Baras, Cardona, Jala-jala, Morong, Pililla, Rodriquez, San Mateo, and Tanay.

Morong has eight (8) barangays, namely: San Pedro, San Juan, and San Jose (Poblacion barangays), Maybancal, Lagundi, Bombongan, San Guillermo, and Calero-Caniogan-Lanag (LGU-Morong 2002); while Teresa has nine (9) barangays, namely: Bagumbayan, Dalig, Dulumbayan, May-iba, Poblacion, Prinza, San Gabriel, San Roque, and Calumpang – Sto. Cristo (Table 4-2). At present, Teresa is comprised of nine (9) barangays: Bagumbayan, Dalig, Dulumbayan, May- iba, Poblacion, Prinza, San Gabriel, San Roque, and Calumpang – Sto. Cristo. There is a proposal to name the eastern section of the municipality, the area from the Marcos Highway towards General Nakar in Quezon Province, as the 10th barangay. The section however, is part of the disputed political claim among Teresa, Baras, and Tanay municipalities.

Table 4-2 Covered Municipalities and Barangays Municipality Number of Barangays AREA (ha) % OF WATERSHED Morong 8 4,856 72.3% Teresa 9 1,860 27.7% Total 17 6,716 100% Source: NSO, 2007

The total population in the watershed area is 72,234 with Morong having 58.8% (42,489) and Teresa with 41.2% (29,745). Teresa registered a 2.98% growth rate while Morong 2.61% or an average of 2.80% growth rate for the sub-basin, slightly higher than the national average of 2.3%.

Source: LLDA GIS Figure 4-2 Political Boundary Map

Land Cover There are seven classes of land cover in Morong sub-basin (urban, forest, arable, plantation, grassland, brushland and marshland), as a result of the land cover validation conducted by LLDA. Grassland and urban areas dominates the whole sub-basin with area of 5,796.99 hectares is seen in the south-eastern to mid-portion of the watershed while forest has the smallest area with area of 0.96 hectares. Arable areas has a total of 1338.45 ha. (Figure 4-3 and Table 4-3).

Table 4-3 Land cover and Area Land Cover Area (ha) Percentage Urban 1874.354 19.99 Forest 0.96 0.01 Arable 1338.451 14.27 Plantation 436.428 4.65 Grassland 3922.645 41.83 Brushland 1620.512 17.28 Marsh 179.986 1.92 Water 0 0.00 Unclass 0 0.00 Cloud 4.739 0.05 Total 9378.075 100.00 Source: LLDA GIS

Source: LLDA GIS Figure 4-3 Land Cover Map

Sub-basin Characterization and Properties

Drainage Network The drainage properties of the Morong Sub-basin which is elongated in shape is presented and summarized in Table 4-4.

Table 4-4 Drainage Properties

Parameters Values Area (ha) 9,926.531

Perimeter (m) 44,760.478

Total number of streams 77 Total length of streams (m) 85134.351

Stream Density (stream/ha) 0.00776 Drainage Density (m/ha) 8.5764

Constance of Channel 0.1166 Maintenance (ha/m) Length of Overland Flow (m) 4.2882226

Source: LLDA GIS

Source: LLDA GIS Figure 4-4 Drainage Map

Sub-sub basin Properties

Source: LLDA GIS Figure 4-5 Sub-sub basin Map of Morong Sub-basin

Table 4-5 Morong Sub sub-basin properties Sub-sub basin Name Area (Ha) Perimeter (m) SSB-4A 164.314 6514.573 SSB-4B 3436.607 61028.510 SSB-4C 124.221 4804.958 SSB-4D 121.824 6478.066 SSB-4E 538.699 11146.660 SSB-4F 216.431 7325.619 SSB-4G 459.689 11727.437 SSB-4H 506.494 11966.917 SSB-4I 481.831 9523.277 SSB-4J 245.296 7253.925 SSB-4K 401.285 9244.999 SSB-4L 277.663 7400.654 SSB-4M 797.057 13475.353 SSB-4N 1171.349 23818.142 SSB-4O 489.292 11481.407 SSB-4P 494.478 8884.890 Source: LLDA GIS Water Quantity

Stream Flow The annual stream flow of the Morong sub-basin is presented in Figure 4-6. The maximum and minimum stream flow is in the year 1991 and 2004 amounting to 7.079695 m3 per second and 3.36557 m3 per second, respectively,

Source: LLDA PDMED Figure 4-6 Annual Stream flow, 1990 - 2004 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 Laguna de Bay. 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, precipitation has the main impact on runoff.

For Morong River Basin, the long term water balances of the basin based on the simulation is shown in the table below . The 15-year average would show that 56.10% of the total rainfall becomes surface run-off, and about 30.30% of rainfall is lost as actual evapotranspiration. The base flow component of the total run-off is quite minimal, with only about 12.90% of rainfall, while the remaining 0.701% is stored as soil moisture and contributes to groundwater aquifer (Figure 4-7).

Table 4-6 Yearly Water Balances based on model simulation (mm). Actual Evapo- Direct Change in YEAR Rainfall Baseflow transpiration Runoff Storage 1990 2,396 689 1,459 404 (157) 1991 2,430 583 1,620 257 (31) 1992 2,121 568 1,272 217 64 1993 1,945 551 999 259 136 1994 2,149 744 1,165 315 (75) 1995 2,220 622 1,155 305 138 1996 1,961 765 957 297 (58) 1997 1,586 647 777 258 (96) 1998 2,160 575 1,136 196 253 1999 2,885 763 1,751 392 (22) 2000 2,852 775 1,710 349 18 2001 2,084 781 1,037 296 (30) 2002 2,349 712 1,344 268 25 2003 1,944 643 1,064 246 (10) 2004 2,274 702 1,263 245 64 Average 2,224 675 1,247 287 15

Source: LLDA PDMED Figure 4-7 Water Balance Percentage, 1990 - 2004