Table of Contents Volume 3. Angono Sub-Basin ................................................................................ 3 Geographic Location .............................................................................................................. 3 Political and Administrative Boundary ..................................................................................... 4 Land Cover ............................................................................................................................. 7 Sub-basin Characterization and Properties............................................................................. 8 Drainage Networks ............................................................................................................. 8 Sub-sub basin Properties ...................................................................................................10 Water Quantity ......................................................................................................................11 Stream Flow ......................................................................................................................11 Water Balance ...................................................................................................................12 LIST OF FIGURES Figure 3-1 Geographical Map ............................................................................................................... 3 Figure 3-2 Political Map of (Angono Main) ............................................................................................ 5 Figure 3-3 Political Map (Angono Talim) ............................................................................................... 6 Figure 3-4 Land Cover Map .................................................................................................................. 7 Figure 3-5 Drainage Map ...................................................................................................................... 9 Figure 3-6 Sub-sub basin Map ............................................................................................................ 10 Figure 3-7 Stream Flow, 1990-2004 ................................................................................................... 12 Figure 3-8 Water Balances based on model simulation, 1990-2004 .................................................. 13 LIST OF TABLES Table 3-1 Geographic extent ................................................................................................................. 4 Table 3-2 Municipalities and Barangays Covered ................................................................................ 4 Table 3-3 Population Distribution by Municipality, 2007 ....................................................................... 4 Table 3-4 Area Distribution of Land Cover ............................................................................................ 7 Table 3-5 Some Relief Features and Other Geo-Morphological Parameters ....................................... 8 Table 3-6 Angono Sub-sub basin properties....................................................................................... 11 Table 3-7 Streamflow Data, 1990-2004 .............................................................................................. 12 Table 3-8 Yearly Water Balances based on model simulation (mm). ................................................. 13 Technical writer Engr. Cornelio O. Gamara, Jr., 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 3. Angono Sub-Basin Geographic Location The Angono sub-basin, lies between the west bay and central bay of the Laguna Lake, spreads over the municipalities of Angono on the west, Cardona on the east, Binangonan on the middle. Taytay on the northwest, Antipolo on the north, Morong and Teresa on the northeast and Laguna de Bay on the south, southeast and southwest bounds the sub-basin with a total land area of about 8,691.051 hectares (Figure 3-1). The division of the Angono sub-basin into mainland and the Talim Island makes it distinct from all the other sub-basins around Laguna Lake. The mainland consists of the municipalities of Angono and of the northern portions of Binangonan and Cardona while the Talim Island has Binangonan on the western side and Cardona on the eastern side. Source: LLDA GIS Figure 3-1 Geographical Map The geographic extent of the sub-basin is presented in Table 3-1. Table 3-1 Geographic extent CORNERS NORTHING (UTM) EASTING (UTM) Upper Left 1580257.50000 312904.09375 Upper Right 1580257.50000 299585.46875 Lower Right 1611817.25000 299585.46875 Lower Left 1611817.25000 312904.09375 Source: LLDA GIS Political and Administrative Boundary The Angono sub-basin covers 73 barangays located in six (6) municipalities located in the province of Rizal (Figure 3-2 and Figure 3-3). Binangonan is the largest municipality accounting for almost 50% (4,069.83 hectares) of the total area of the sub-basin as shown in Table 3-2. In view of barangays covered, Binangonan has the most with thirty nine (39), followed by Cardona with eighteen (18) barangays with an area of 2,367.97 hectares or 28.74% and Angono which comprises of ten (10) barangays with an area of 1,749.92 04 21.24%. Table 3-2 Municipalities and Barangays Covered MUNICIPALITY NO. OF BARANGAYS AREA (HA.) PERCENTAGE (%) Angono 10 1,749.92 21.24 Binangonan 39 4,069.83 49.40 Cardona 18 2,367.97 28.74 Antipolo 3 30.16 0.37 Teresa 2 8.66 0.1 Taytay 1 12.21 0.15 TOTAL 73 8,238.75 100 The total population in the sub-basin area is 333,986 with Binangonan having 63.67% (212,649), Angono with 23.54% (78,642), and Cardona with 12.78% (42,695) as stipulated in Table 3-3. Angono registered the highest growth rate at 3.71% while Binangonan 3.51% and Cardona at 1.97% or an average of 3.06% growth rate for the entire watershed, which is higher than the national average of 2.3%. Table 3-3 Population Distribution by Municipality, 2007 MUNICIPALITY POPULATION ANNUAL GROWTH RATE (%) Binangonan, Rizal 212,649 3.51 Angono, Rizal 78,642 3.71 Cardona, Rizal 42,695 1.97 TOTAL 333,986 National Statistics Office, 2007 Census of Population Source: LLDA GIS Figure 3-2 Political Map of (Angono Main) Source: LLDA GIS Figure 3-3 Political Map (Angono Talim) Land Cover There are six classes of land cover in the Angono sub-basin: forest, plantation, marshy, grass, built-up and arable (Table 3-4). About (38%) of the sub-basin is classified as built-up, i.e., residential, commercial and industrial use. The second biggest land use in the sub-basin is brush. Figure 3-4 show the land cover and the land cover map. Table 3-4 Area Distribution of Land Cover LAND COVER AREA (HA) PERCENTAGE (%) Built-up 3,328,51 38.30 Plantation 119.37 1.37 Grass 2,223.08 25.75 Arable 543.71 6.25 Brush 2,358.06 27.13 Marsh 117.42 1.35 TOTAL 8.690.15 100 Source: LLDA GIS Source: LLDA GIS Figure 3-4 Land Cover Map Sub-basin Characterization and Properties Drainage Networks The drainage map of the Angono Sub-basin is shown in Figure 3-5 while the important watershed characteristics and geomorphological features are in Table 3-5. Table 3-5 Some Relief Features and Other Geo-Morphological Parameters PARAMETERS VALUES Area (ha) 8691.051 Perimeter (m) 99109.919 Total number of streams 35 Total length of streams (m) 48678.774 Stream Density (stream/ha) 0.00403 Drainage Density (m/ha) 5.6010 Constance of Channel Maintenance (ha/m) 0.1785 Length of Overland Flow (m) 2.8005 Source: LLDA GIS Figure 3-5 Drainage Map Sub-sub basin Properties Source: LLDA GIS Figure 3-6 Sub-sub basin Map Table 3-6 Angono Sub-sub basin properties SUB BASIN NAME SUB-SUB BASIN NAME AREA (Ha) PERIMETER (m) Angono SSB-3A 662.380 17596.476 SSB-3B 49.177 3501.084 SSB-3C 394.839 10665.732 SSB-3D 526.222 14314.771 SSB-3E 369.816 10279.835 SSB-3F 763.008 14525.707 SSB-3G 311.556 8836.081 SSB-3H 280.154 8817.257 SSB-3I 673.652 15558.623 SSB-3J 0.000 242.536 SSB-3J 327.664 7644.578 SSB-3K 72.378 4251.555 SSB-3L 1356.615 25093.333 SSB-3M 258.095 7856.630 Angono-Talim SSB-3TA 355.072 11538.831 SSB-3TB 40.047 2832.342 SSB-3TC 110.173 5600.899 SSB-3TD 33.134 2701.663 SSB-3TE 821.788 15201.283 SSB-3TF 261.181 8145.824 SSB-3TG 114.272 4705.085 SSB-3TH 77.154 3925.916 SSB-3TI 91.656 3869.825 SSB-3TJ 193.673 7441.958 SSB-3TK 79.559 4143.391 SSB-3TL 408.269 12269.949 SSB-3TM 58.491 3466.111 Source: LLDA GIS Water Quantity Stream Flow Stream flow refers to the discharge measurement at a given gauging station. It is simply computed as velocity multiplied by the cross-sectional area of a river or stream. Usually velocity is measured either by using a stream gauge, or using current or float methods. This is usually expressed in cubic meters per second (cu. m/sec). The highest recorded stream flow was observed in year 1990 with 5.348 cu m/sec while the lowest recorded in the river basin is 1.324 cu m/sec. (Table 3-7 and Figure 3-7). Table 3-7 Streamflow Data, 1990-2004 YEAR STREAMFLOW 1990 5.348209399 1991 4.048185459 1992 4.159453691 1993 2.602543362 1994 2.794343652 1995 2.994795089 1996 2.412182363 1997 1.324230989 1998 2.254185465 1999 3.778395988 2000 3.715998181 2001 2.669433044 2002 2.629000914 2003 2.681313856 2004 3.729950294 Source: LLDA PDMED Source: LLDA PDMED Figure 3-7 Stream Flow, 1990-2004 Water Balance The Sacramento Soil Mositure Accounting