Soil Conservation and Watershed Management CY 2012

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Watersheds help sustain the life support systems as well provide the socioeconomic base through the utilization of watershed resources. It is important therefore to protect and improve the water quality, quantity and security. The program aims to enhance the remaining forest cover within the watershed areas that has already lost its original vegetation through forest restoration.

  • Watershed Management Planning:

              ♦ Watershed Characterization- This year, watershed characterization and planning was implemented in San Juan River Watershed in the municipalities of Lipa Tanauan, Malvar, and Sto. Tomas in the Province of Batangas and in the municipalities of Alaminos and Calamba City in the Province of Laguna. T h e w a t e r s h e d character izat ion and vulnerability assessment of the San Juan River Watershed (SJRW) were the product of thorough a n d c omp r e h e n s i ve surveys and analyses jointly undertaken by the D e p a r t m e n t o f Environmental and Natural Resources (DENR), Region 4A-CALABARZON and the UPLB College of Forestry and Natural Resources from April 2012 up to September 2012 following a participatory, holistic, demand-driven and science and information-based planning process. It was intended that this watershed characterization and vulnerability assessment will guide the systematic formulation and eventual implementation of various programs, projects and activities that are responsive to the needs of the San Juan River Watershed. The end in view was the enhancement of the sustainability of watershed resources, ecosystems and services that are crucial to the operations and the welfare of communities and other watershed stakeholders. The participation of local government units (LGUs), local communities, nong o v e r n m e n t o r g a n i z a t i o n s (NGOs), academe, National Power Corporation, DENR and other key stakeholders in the planning process provided multiple means in the assessment of different issues and concerns involved in the watershed. More importantly, the active stakeholders’ engagement provided inputs for the preparation integrated watershed management plan of the San Juan River Watershed.

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             ♦ Preparation of Integrated Watershed Management Plan (IWMP)- For the preparation of the IWMP, the UPLB College of Forestry and Natural Resources was able to identify activities/projects to address problems besetting the watershed. However, final consultation with the stakeholders has not been conducted yet, hence, final IWMP is Detailed Accomplishments and/or Milestones CY 2012 Annual Report - DENR CALABARZON Region 31 still with them and requesting for the submission of their final output in January of 2013.

             ♦ Vulnerability Assessment (VA)- Vulnerability assessment is an integral part of this report in recognition of the potential impacts of climate change and variability on the operations of San Juan River Watershed (SJRW) and Sta. Cruz Watershed on the watershed resources, ecosystems and services. Along with the key features of the report, described herein are the vulnerability to landslide, soil erosion, flooding, water pollution, degradation/ biodiversity loss, and forest fire of the watershed.

             ♦ Sta. Cruz Watershed The Sta. Cruz watershed is situated in the province of Laguna covering an area of about 12,445.54 hectares and makes up eight (8) municipalities of the province to wit: Nagcarlan, Liliw, Rizal, Majayjay, Magdalena, Pagsanjan, Pila and Sta. Cruz, Laguna. The whole watershed is divided into three (3) sub-watershed to wit: 1)Nagcarlan Sub-watershed ( Liliw, Rizal, Nagcarlan) 2) Mimpis subwatershed (Liliw, Nagcarlan, Majayjay and Magdalena) and 3) Sta.Cruz Sub-watershed (Sta.Cruz, Liliw, Nagcarlan, Pila, Pagsanjan and Magdalena) It is called the Sta. Cruz watershed, because the watershed is draining towards the Sta. Cruz River, the downstream river system that received enormous water from several river tributaries within the province of Laguna. The Sta. Cruz watershed area is geographically located at 121 26’34.7” longitudes and 14 11’ 01.2” latitude. The headwater of the whole Sta. Cruz watershed is found in Mt. Banahaw- San Cristobal Protected landscape. Several rivers, creeks and springs are draining into the Sta. Cruz watershed and finally into Laguna Lake that serves as the catchment area of several river basins and also known as the largest living lake in Southeast Asia. The natural springs are the main source of potable water for the communities within. In the case of Nagcarlan, Laguna, almost all barangays are being served by the Detailed Accomplishments and/or Milestones Bangkoro, Sta. Lucia, and Mojor River in Nagcarlan, Laguna CY 2012 Annual Report - DENR CALABARZON Region 32 waterworks systems. Hydrology sampling stations were established along the stretch of the river traversing the watershed area to determine the rate of stream flow or discharge of the watershed. This can also determine the rate of surface run-off and the sediment load of the stream.

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  • Introduction of Soil and Water Conservation (SWC) Measures- For the year, two (2) 50 cubic meter-check dams or were constructed in 2 different sites of San Juan River within the municipalities of Sto. Tomas and Malvar, Batangas, while a total of 100,000 sq. m. of hedgerow were established along the stretch of San Juan River crossing the different barangays in the municipalities of Malvar, Batangas.