Table of Contents

Volume 9. Sta. Maria Sub-basin ...... 3 Geographic Location ...... 3 Political Boundary ...... 4 Land Cover ...... 5 Sub-basin Characterization and Properties...... 7 Drainage Network ...... 7 Sub-sub basin Properties ...... 9 Water Quantity ...... 9 Stream flow ...... 9 Water Balance ...... 10

LIST OF FIGURES Figure 9-1 Geographical Map ...... 3 Figure 9-2 Political Map of Sta. Maria Sub-basin...... 5 Figure 9-3 Land Cover Map ...... 6 Figure 9-4 Drainage Map ...... 7 Figure 9-5 Sub-sub basin Map ...... 8 Figure 9-6 Stream flow trend...... 9 Figure 9-7 15-Year Average Water Balances (mm) ...... 10

LIST OF TABLES Table 9-1 Geographic extent ...... 4 Table 9-2 Area Distribution of Barangays ...... 4 Table 9-3 Population, 2007 ...... 4 Table 9-4 Land Cover ...... 6 Table 9-5 Drainage Properties ...... 7 Table 9-6 Sta. Maria Sub-sub basin properties ...... 9 Table 9-7 Yearly Water Balances (mm) ...... 10

Technical writer Mr. Dennis A. Tiongson, 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 9. Sta. Maria Sub-basin

Geographic Location The Sta. Maria Sub-basin is a multi-municipality sub-basin composed of 8 municipalities from three provinces of , and namely Jala-Jala, , and Tanay, Rizal, , , , Santa Maria, Laguna and Real, Quezon. The total land area of Sta. Maria Sub-basin is 20,531.545 hectares. Almost half of the sub-basin is covered by the Municipality of Sta. Maria (49%). Close to one-fourth of the sub-basin is covered by the Municipality of Mabitac. Some 2,144.69 hectares is in the Municipality of Pililla (10.47%). However. Real, Quezon is not within the territorial jurisdiction of LLDA.

To the northwest is Tanay, Rizal while to the northeast is Real, Quezon. To the east is , Laguna while to west is Pililla, Rizal and to the south of the sub-basin is the Lake. The coordinates and the satellite image of the sub-basin are shown in Table 9-1 and Figure 9-1, respectively.

Source: LLDA GIS Figure 9-1 Geographical Map

Table 9-1 Geographic extent CORNERS NORTHING (UTM) EASTING (UTM) Upper Left 1585870.37500 336177.87500 Upper Right 1585870.37500 321603.09375 Lower Right 1611947.87500 321603.09375 Lower Left 1611947.87500 336177.87500 Source: LLDA GIS

Political Boundary The sub-basin is politically and administratively composed of 7 municipalities located in , Pililla, and Tanay in Rizal and Mabitac, Pakil, Pangil, and Sta. Maria in Laguna.. In addition, the sub-basin has a total of 55 barangays (Table 9-2). Figure 9-2 illustrates the political map of the sub-basin which also shows the distribution.

Table 9-2 Area Distribution of Barangays Municipality / City No. of Area (ha) Percent (%) Barangays JalaJala 1 663.739 3.25 Pillla 4 1259.846 6.17 Tanay 2 1319.412 6.46 Mabitac 15 5299.883 25.95 Pakil 6 1390.795 6.81 Pangil 6 328.403 1.61 Sta. Maria 25 10158.818 49.75 TOTAL 55 20420.799 100 Source: LLDA GIS

The Sta. Maria Sub-basin has a total population of 269,261 inhabitants based on 2007 NSO census (Table 9-3).

Table 9-3 Population, 2007 JalaJala 28,738 Pillla 58,525 Tanay 94,460 Mabitac 17,608 Pakil 20242 Pangil 23421 Sta. Maria 26,267 TOTAL 269,261 Source: NSO, 2007

Source: LLDA GIS Figure 9-2 Political Map of Sta. Maria Sub-basin

Land Cover The Sta. Maria sub-basin is basically classified as urban, marshy, grass, water, and arable (Table 9-4). Almost the entire sub-basin (78%) is classified as brush, forest and plantation (Figure 9-3). The situation clearly indicates the importance of agriculture which is the major source of livelihood in the sub-basin.

Table 9-4 Land Cover Sta. Maria Sub-basin Type Hectares Percentage ARABLE 1859.952 9.06% BRUSH 9608.037 46.79% CLOUD 0.844 0.00% FOREST 2895.068 14.10% GRASS 1250.476 6.09% MARSH 197.371 0.96% PLANTATION 3700.934 18.02% URBAN 1022.098 4.98% TOTAL 20534.780 100.00% Source: LLDA GIS

Source: LLDA GIS Figure 9-3 Land Cover Map

Sub-basin Characterization and Properties

Drainage Network The drainage properties of the Santa Maria Sub-basin which is elongated in shape is presented and summarized in Table 9-5.

Table 9-5 Drainage Properties

Parameters Values Area (ha) 20531.545 Perimeter (m) 78828.922 Total number of streams 102

Total length of streams (m) 247651.039 Stream Density (stream/ha) 0.00497 Drainage Density (m/ha) 12.0620 Constance of Channel 0.0829 Maintenance (ha/m) Length of Overland Flow (m) 6.030988

Source: LLDA GIS

Source: LLDA GIS Figure 9-4 Drainage Map

Source: LLDA GIS Figure 9-5 Sub-sub basin Map

Sub-sub basin Properties

Table 9-6 Sta. Maria Sub-sub basin properties Sub-sub basin Name Area (Ha) Perimeter (m)

SSB-9A 376.326 8434.773 SSB-9B 1228.741 21090.230 SSB-9C 1609.504 18597.797 SSB-9D 1035.970 24471.059 SSB-9E 2032.606 22013.237 SSB-9F 439.887 11120.604 SSB-9G 1252.864 15949.336 SSB-9H 957.335 13705.264 SSB-9I 932.524 15808.881 SSB-9J 415.474 11220.701 SSB-9K 895.952 12754.212 SSB-9L 2848.806 43807.288 SSB-9M 2104.934 28997.611 SSB-9N 1322.942 23001.037 SSB-9O 405.925 9215.062 SSB-9P 629.261 12639.442 SSB-9Q 424.510 11897.809 SSB-9R 996.243 13585.679 SSB-9S 621.676 12453.013 Source: LLDA GIS

Water Quantity

Stream flow The highest stream flow rate was recorded in 1999 with 14.99 m3/sec while the lowest was in 1997 with 4.20 m3/sec, which can be attributed to the El Nino phenomenon. Figure 9-6, shows the stream flow trend through out the 14-year period. The 15-year average flow rate is 8.7 m3/sec.

Source: LLDA PDMED Figure 9-6 Stream flow trend

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, precipitation has the main impact on runoff.

The 15-year rainfall data simulation shows that on the average, 50% of total rainfall goes to direct run off, while 35.8% is lost to evapotranspiration. (Table 9-7 and Figure 9-7).

Table 9-7 Yearly Water Balances (mm) YEAR Rainfall Actual Evapo- Direct Baseflow Change in transpiration Runoff Storage 1990 2,053 719 1,059 394 (120) 1991 1,586 703 612 227 45 1992 1,695 771 687 240 (3) 1993 1,906 702 820 256 128 1994 2,115 828 1,044 313 (70) 1995 1,934 602 1,044 222 66 1996 1,943 771 942 244 (15) 1997 1,259 765 433 183 (122) 1998 2,855 678 1,759 183 235 1999 2,977 759 1,755 437 26 2000 2,470 797 1,287 336 51 2001 1,848 801 798 288 (39) 2002 1,932 655 1,022 255 (0) 2003 1,664 711 721 254 (22) 2004 2,401 692 1,341 289 80 Average 2,042 730 1,022 275 16 Source: LLDA PDMED

Source: LLDA PDMED Figure 9-7 15-Year Average Water Balances (mm)