Caliraya Sub-Basin
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TABLE OF CONTENTS Volume 12. Caliraya Sub-basin ............................................................................................... 3 Geographic Location .............................................................................................................. 3 Political and Administrative Boundary ..................................................................................... 4 Land Cover ............................................................................................................................. 5 Sub-basin Characterization and Properties............................................................................. 8 Drainage Network ............................................................................................................... 8 Sub-sub basin Properties ...................................................................................................10 Water Quantity ......................................................................................................................11 Streamflow .........................................................................................................................11 Water Balance ...................................................................................................................12 LIST OF FIGURES Figure 12-1 Geographical Map ..................................................................................................................... 3 Figure 12-2 Political Map .............................................................................................................................. 5 Figure 12-3 Land Cover Map ........................................................................................................................ 7 Figure 12-4 Drainage Map ............................................................................................................................ 9 Figure 12-5 Sub-sub basin Map of Caliraya Sub-basin .............................................................................. 10 Figure 12-6 Streamflow, 1990-2004 ........................................................................................................... 12 Figure 12-7 Water Balances based on model simulation, 1990-2004 ........................................................ 13 LIST OF TABLES Table 12-1 Geographic Extent ...................................................................................................................... 4 Table 12-2 Municipalities and Barangays Covered ...................................................................................... 4 Table 12-3 Population Distribution by Municipality, 2007 ............................................................................. 5 Table 12-4 Area Distribution of Land Cover .................................................................................................. 6 Table 12-5 Some Relief Features and Other Geo-Morphological Parameters ............................................. 8 Table 12-6 Caliraya Sub-sub basin properties ............................................................................................ 11 Table 12-7 Streamflow Data, 1990-2004. ................................................................................................... 11 Table 12-8 Yearly Water Balances based on model simulation (mm). ....................................................... 12 Technical writer For. Azyleah C. Abino, 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 12. Caliraya Sub-basin Geographic Location The Caliraya sub-basin is located at the southeastern part of the Laguna de Bay basin and about 105 km southeast of Metro Manila. It is approximately situated between 121029’59.15” to 121036’58.75” longitude and 14o22’4.16” to 14o12’58.54” latitude. It is bounded by the Paete/Pangil/Pakil sub-basin in the east, Pagsanjan sub-basin in the west, the East Bay of Laguna Lake to the north, and Mt. Banahaw to the south. Six municipalities coming from two provinces are located within the sub-basin, namely Cavinti, Kalayaan, Lumban and Paete in the Province of Laguna and Mauban and Sampaloc in Quezon Province. Figure 12-1 illustrates the geographic location and boundary of the Caliraya sub-basin in the Laguna de Bay. Source: LLDA GIS Figure 12-1 Geographical Map The whole sub-basin has an aggregate area of 13,526.21 hectares, with a basin length of 3.55 kilometers (km) bounded with 45.5 52.84 km perimeter length. The geographic extent of the sub-basin is presented in Table 12-1. Table 12-1 Geographic Extent CORNERS NORTHING (UTM) EASTING (UTM) Upper Left 1571566.12500 351784.40727 Upper Right 1571566.12500 336096.34375 Lower Right 1590120.87500 336096.34375 Lower Left 1590120.87500 351784.40727 Source: LLDA GIS Political and Administrative Boundary The Caliraya sub-basin covers 21 barangays located in six municipalities in the Province of Laguna and Quezon (Figure 12-2). Table 12-2 shows the name of barangays making up the sub-basin. Cavinti has the most with eight followed by Paete with five. Mauban in the Province of Quezon has the least number of barangay with only one. On the other hand, in terms of area covered, Lumban dominates the area with 5,056.89 hectares or 37.39%, followed by Kalayaan having an area of 3,701.08 hectares or 27.36% and Cavinti with 3,428.95 hectares or 25.35% of the sub-basin. Only 11.20 hectares or 0.08% of the sub-basin is attributed to Mauban, Quezon (Table 12-2). Out of the 13,526.21 hectares total land area of the sub-basin, of which 6,126.32 hectares are found within the reserve. As such, the National Power Corporation by virtue of Presidential Proclamation No. 573 has jurisdiction, authority and control over watershed reservation areas supporting power generating plants and properties including Caliraya and Lumot River Forest Reserve while the Department of Environment and Natural Resources (DENR) through the Laguna Lake Development Authority (LLDA) manages the areas fall outside of it. Table 12-2 Municipalities and Barangays Covered MUNICIPALITY NO. OF BARANGAYS AREA (ha) PERCENTAGE Cavinti, Laguna 8 3,428.95 25.35 Kalayaan, Laguna 3 3,701.08 27.36 Lumban, Laguna 2 5,056.89 37.39 Paete, Laguna 5 1,246.43 9.21 Mauban, Quezon 1 11.20 0.08 Sampaloc, Quezon 2 81.68 0.60 TOTAL 21 13,526.21 100.00 The 2007 Census of Population by the National Statistics Office indicated that the total population within the Caliraya sub-basin is estimated at 46,300. Kalayan which ranks second largest municipality within the sub-basin, shared the highest number of inhabitants with 38% or 17,408. Next is by the municipality of Lumban with 25% or 11,434 residents followed closely by Paete having 24% or 11,113. Cavinti has the most number of barangays (8) within the sub- basin, however, it contributes the least number of inhabitants with only 14% or 6,345. Table 12- 3 shows the detailed population data of each municipalities as well as the annual growth rate. Table 12-3 Population Distribution by Municipality, 2007 MUNICIPALITY POPULATION ANNUAL GROWTH RATE (%) Cavinti, Laguna 6,345 0.68 Kalayaan, Laguna 17,408 1.10 Lumban, Laguna 11,434 1.28 Paete, Laguna 11,113 0.98 Total 46,300 National Statistics Office, 2007 Census of Population Source: LLDA GIS Figure 12-2 Political Map Land Cover Based on most recent data, the land covers in Caliraya sub-basin were classified into forest, arable land, plantation, grassland, brushland, urban/built up areas. Some 38% or 5,685 hectares of the total area of the sub-basin is unclassified while 10% or 1,534 hectares is identified as municipal water comprising the man-made lakes: Caliraya and Lumot. Table 12-4 show the land cover distribution in the sub-basin of Caliraya while Figure 12-3 shows the land cover map. The Caliraya-Lumot sub-basin area is dominated by non-forest areas including a mix of seasonal slash and burn brushland and grasslands (18% or 2,738 hectares). The more inaccessible areas contain secondary and degraded forest which accounts to only 4% or 579 hectares. The secondary forests were mostly found in the northeastern part of the sub-basin and a small patch was located in Holon in Barangay Paowin. There are 200 known tree species in the area, seven of which belong to the family Dipterocarpaceae. The non-dipterocarpaceae species commonly found in the area include Dillinea philippinensis, Litsea peroteti, Sandoricum koetjape, Canarium asperum, Macaranga bicoor, among others. Coconut plantations intercropped with other perennials, mainly fruit trees like Sandoricum koetjape, Artocarpus heterophyllus and Mangifera indica are also found within spreading approximately 15% or 2,299 hectares. Areas where land use is considered as agriculture or arable (4% or 606 hectares) include mainly annuals. Rice, cassava and sweet potato are the major crops raised. Around the Caliraya and Lumot lakeshore there are built up areas (11% or 1,639 hectares) with some patches of coconut groves and agricultural crops. These areas are mainly residential in nature with few small commercial establishments. The areas devoted to real property development are those with big recreational resort developments. They are concentrated around the Caliraya Lake. Table 12-4 Area Distribution of Land Cover LAND COVER AREA (ha) PERCENTAGE Urban 1,639.01 10.87% Forest