Table of Contents

Volume 1. Marikina Sub-basin ..................................................................................... 3

Geographic Location .............................................................................................................. 3

Political and Administrative Coverage ..................................................................................... 4

Land Cover ............................................................................................................................. 5

Drainage Network ................................................................................................................... 7

Sub-basin Characterization and Properties ......................................................................... 7

Sub-sub basin Properties ...................................................................................................10

Water Quantity ......................................................................................................................10

Stream Flow ......................................................................................................................10

Water Balance ...................................................................................................................11

LIST OF FIGURES

Figure 1-1 Geographical Map ............................................................................................................... 3 Figure 1-2 Political Jurisdiction ............................................................................................................. 5 Figure 1-3 Land Cover Map .................................................................................................................. 6 Figure 1-4 Drainage Map ...................................................................................................................... 8 Figure 1-5 Sub-sub basin Map of Marikina Sub-basin .......................................................................... 9 Figure 1-6 Stream Flow for the Marikina Sub-basin, 1990-2004 ........................................................ 11 Figure 1-7 Water Balance Percentage (1990-2004) ........................................................................... 12

LIST OF TABLES

Table 1-1 Geographic extent ................................................................................................................. 4 Table 1-2 Covered Municipalities and Barangays ................................................................................ 4 Table 1-3 Population Distribution by Municipality/City, 2007 ................................................................ 4 Table 1-4 Landcover Classification and Distribution ............................................................................. 6 Table 1-5 Some Relief Features and Other Geo-Morphological Parameters ....................................... 7 Table 1-6 Marikina Sub-sub basin properties ..................................................................................... 10 Table 1-7 Yearly Water Balances based on model simulation (mm) .................................................. 11

Technical writer

For. Alvin A. Faraon, LLDA-PDMED

Technical editors Ms. Adelina C. Santos-Borja Officer-In-Charge Resource Management and Development Officer

Engr. Emiterio C. Hernandez Officer- In Charge Project Development Management and Evaluation Division

Map production

Mr. Neil V. Varcas, LLDA-PDMED

Volume 1. Marikina Sub-basin

Geographic Location The Marikina Sub-basin encompasses the cities of Antipolo, Marikina, Pasig, and Quezon and the municipalities of San Mateo and Rodriguez, province of Rizal (Figure 1-2). The total area of the sub-basin is about 48,828.12 hectares majority of which covers Rodriguez followed by the City of Antipolo (Table 1-1). The center of the sub-basin defined by coordinates 121°12”14 E and 14°40”17” N.

Source: LLDA GIS (produced using data from SDLBE project, 2000, watershed delineation processed from SRTM3 DEM collected in February 2000 by NASA)

Figure 1-1 Geographical Map

Table 1-1 Geographic extent

CORNERS NORTHING (UTM) EASTING (UTM)

Upper Left 1610233.75000 319835.55351

Upper Right 1610233.75000 291073.64698

Lower Right 1640934.90965 291073.64698

Lower Left 1640934.90965 319835.55351 Source: LLDA GIS Unit

Political and Administrative Coverage Rodriquez occupies the largest area in the sub-basin (36.15%) covering 11 barangays while the Pasig City has the smallest at 2.13% comprising 20 barangays. Almost thirty-five percent of the total watershed area is covered by Antipolo City. On the other hand, Marikina, Tanay, Quezon City, and San Mateo occupy 3.29%, 7.05% and 12.38%, respectively (Figure 1-2) The table below presents all municipalities within the Marikina sub-basin and their corresponding land areas.

Table 1-2 Covered Municipalities and Barangays

Source: LLDA GIS Unit

Per the 2007 census, the total population of the sub-basin is about 1,579,647. Although only the easternmost portion of Quezon City is part of the sub-basin, it accounted for the largest population share of 40.36 percent or 637,594 in view of the fact that it is the most populated city in the country. On the other hand, Tanay had the least share of 0.09 percent being the least populated of the LGUs which are part of the sub-basin (Table 1-3). There were 328,131 households within the sub-basin with an average household size of 4.72. Marikina City had the highest average household size of 4.84 while Pasig City had the lowest with 4.56.

Table 1-3 Population Distribution by Municipality/City, 2007

National Statistics Office, 2007 Census of Population

Municipality/City Number of Barangays Covered Area (ha) Percentage

Antipolo 9 17036.15 34.89

Marikina 13 1519.02 3.11

Pasig 20 1040.20 2.13

Quezon City 23 3260.97 6.68

Rodriguez 11 17649.76 36.15

San Mateo 15 5724.39 11.72

Tanay 3 2597.639 5.320

Total 94 48828.12 100.00

Municipality/City Population Percentage

Antipolo 175405 11.10

Marikina 240535 15.23

Pasig 136149 8.62

Quezon City 637594 40.36

Rodriquez 205244 12.99

San Mateo 183309 11.60

Tanay 1411 0.09

Total 1579647 100.00

Source: LLDA GIS (produced using data from SDLBE project, 2000, watershed delineation processed from SRTM3 DEM collected in February 2000 by NASA)

Figure 1-2 Political Jurisdiction

Land Cover There are ten classes of land cover in the Marikina Sub-basin: urban, forest, arable, plantation, grassland, brushland, marsh, water, cloud, unclass (Table 1-4). Based on GIS analysis, grassland and brushland areas pre-dominate the sub-basin area with 14236.71 hectares or 25.97% and 13159.74 hectares or 24.01%. Forested areas are about 7638.14 or 13.9% while urban/built-up areas are about 9505.37 hectares or 17.35%. The remaining landcover are arable, plantation, marsh and water/marsh areas. Patches of forest cover is found in the uplands of Barangays Puray and parts of Barangays Mascap, San Rafael, and Burgos in Rodriguez and also parts of Barangays San Jose and Calawis in Antipolo City. Built-up areas are dominant in the middle and western lowlands of the sub-basin. Grasslands are found in Barangays San Jose and Calawis in Antipolo City Barangays san Rafael, Puray, and Rosario in Rodriguez. Figure 1-3 show the land cover map.

Source: LLDA GIS (Processed from SPOT5 2003, re-validated/groundtruthed in year 2010)

Figure 1-3 Land Cover Map

Table 1-4 Landcover Classification and Distribution

Land Cover Area (ha) Percentage

Urban 9505.373 17.3456

Forest 7638.132 13.9382

Arable 2510.032 4.5803

Plantation 7554.101 13.7848

Grassland 13159.74 24.0141

Brushland 14236.71 25.9794

Marsh 0.59 0.0011

Water 169.352 0.3090

Cloud 1.251 0.0023

Unclass 24.755 0.0452

Total 54800.03 100.00 Source: LLDA GIS Unit

Drainage Network Sub-basin Characterization and Properties The drainage map of the Marikina Sub-basin is shown in Figure 1-4 while the important watershed characteristics and geomorphological features are in Table 1-5.

Table 1-5 Some Relief Features and Other Geo-Morphological Parameters

Source: LLDA GIS Unit

Parameters Values

Area (ha) 54,325.624

Perimeter (m) 14,3794.246

Total number of streams 331

Total length of streams (m) 53,5383.540

Stream Density (stream/ha) 0.00609

Drainage Density (m/ha) 9.8551

Constance of Channel Maintenance (ha/m) 0.1015

Length of Overland Flow (m) 4.9275

Source: LLDA GIS (produced using data from SDLBE project, 2000, watershed delineation processed from SRTM3 DEM collected in February 2000 by NASA)

Figure 1-4 Drainage Map

Source: LLDA GIS (produced using data from SDLBE project, 2000, watershed delineation processed from SRTM3 DEM collected in February 2000 by NASA)

Figure 1-5 Sub-sub basin Map of Marikina Sub-basin

Sub-sub basin Properties

Table 1-6 Marikina Sub-sub basin properties

Sub-sub basin Name Area (Ha) Perimeter (m)

SSB-1A 800.293 19474.213

SSB-1AA 915.667 17002.672

SSB-1B 1254.132 20955.313

SSB-1BB 216.844 6423.645

SSB-1C 824.482 13296.737

SSB-1CC 1393.373 21634.442

SSB-1D 546.436 13386.578

SSB-1DD 1280.193 21641.603

SSB-1E 182.031 6068.679

SSB-1EE 256.036 7711.977

SSB-1F 252.408 7892.990

SSB-1FF 599.159 12401.623

SSB-1G 1236.525 19669.964

SSB-1GG 758.663 15648.275

SSB-1H 7825.943 50556.255

SSB-1HH 3623.350 36315.974

SSB-1I 4013.539 44546.601

SSB-1J 1054.860 19891.954

SSB-1K 844.517 20963.080

SSB-1L 1053.117 17202.123

SSB-1M 255.265 7887.354

SSB-1N 828.901 18902.871

SSB-1O 1994.617 24655.127

SSB-1P 1420.208 18379.762

SSB-1Q 10633.760 134292.479

SSB-1R 344.100 7743.323

SSB-1S 3312.019 30147.403

SSB-1T 644.942 13599.126

SSB-1U 415.587 8959.413

SSB-1V 1934.703 21153.145

SSB-1W 589.388 13573.804

SSB-1X 2095.785 20266.402

SSB-1Y 170.505 5992.967

SSB-1Z 754.711 15700.703 Source: LLDA GIS Unit Water Quantity Stream Flow The mean average stream flow of Marikina River Basin from 1990-2004 is 33.91551 cu m/s. The maximum average stream flow was recorded in year 1999 amounting to 51.45392 cu m/s while the minimum stream flow was accounted in year 2004 with only about 26.03008 cu m/s. The Stream Flow of Marikina River Basin (1990-2004) is presented in Figure 1-6.

Source: LLDA PDMED

Figure 1-6 Stream Flow for the Marikina Sub-basin, 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 Marikina River Basin, the long term water balances of the basin based on the hydrologic

simulation is shown in the table belowError! Reference source not found.. The 15-year

average would show that 60.10% of the total rainfall becomes surface run-off, and about

26.20% of rainfall is lost as actual evapotranspiration. The base flow component of the total run-

off is quite minimal, with only about 12.7% of rainfall, while the remaining 0.90% is stored as soil

moisture and contributes to groundwater aquifer (Table 1-7).

Table 1-7 Yearly Water Balances based on model simulation (mm) YEAR Rainfall Actual Evapo-transpiration Direct Runoff Baseflow Change in Storage

1990 3,033 698 2,007 445 (117)

1991 2,417 634 1,557 273 (48)

1992 2,381 621 1,426 258 77

1993 2,296 579 1,281 297 139

1994 2,342 764 1,304 352 (79)

1995 2,629 625 1,504 342 158

1996 2,350 798 1,253 348 (49)

1997 2,100 692 1,181 312 (85)

1998 2,719 589 1,589 272 268

YEAR Rainfall Actual Evapo-transpiration Direct Runoff Baseflow Change in Storage

1999 3,680 774 2,424 482 (1)

2000 3,639 784 2,406 433 16

2001 2,703 824 1,516 369 (5)

2002 2,857 692 1,799 317 49

2003 2,439 677 1,473 298 (9)

2004 2,263 703 1,220 280 60

Average 2,657 697 1,596 339 25 Source: LLDA PDMED

Source: LLDA PDMED

Figure 1-7 Water Balance Percentage (1990-2004)