Presentation on theme: "Tubig:Kinabuhi Water is Life. Tamugan Surface Water Development Project."— Presentation transcript:
Tubig:Kinabuhi Water is Life
Tamugan Surface Water Development Project
Outline Background Looming Water Crisis Why Surface Water Why Tamugan River Conflict between Power and Water Projects DCWD Position
...put the looming crisis over water shortages at the top of the global agenda this year and take action to prevent conflicts over scarce supplies. UN Secretary General Ban Ki-moon Background
Davao City is one of the nine water-critical urbanized areas in the Philippines where water is consumed intensively. NWRB says... NATIONAL WATER RESOURCES BOARD Background
Is there a looming water crisis? YES!
Major City Exploitable Groundwater (MCM/ year) Water Demand (MCM/year) Ratio of Demand in 2025 to Demand in Metro Manila191 1,068 2, Metro Cebu Davao City Baguio City Angeles City Bacolod City Iloilo City Cagayan de Oro City Zamboanga City Source: Master Plan Study on Water Resources Management in the Philippines: Final Report National Water Resources Board (NWRB), August 1998 Water Demand and Groundwater Potential in Selected 9 Major Urban Areas
Projected residual volume of GW in the Talomo-Lipadas Watershed Source: Asia-Geodyne Corporation, commissioned by DENR XI, MEIP and World Bank YEARGWR (MLD)GWU (MLD) RESIDUAL (MLD)
Drop in Static Water Level 3.25 meters for 9 wells Upon Drilling out of 43 Wells are Free-flowing Sources: C. Lotti-LWUA Study and DCWD ECD and PD
Decline in Forest Cover 1987 – 6,170 hectares Source: State of Talomo-Lipadas Watershed: A Report, by PCEEM, 2006
Decline in Forest Cover 2002 – 2,593 hectares Source: State of Talomo-Lipadas Watershed: A Report, by PCEEM, 2006
Bases and Indicators of a Looming Water Crisis NWRB Data ( Water Demand and Groundwater Potential ) Asia-Geodyne Corporation, commissioned by DENR XI, MEIP and World Bank ( Diminishing residual volume of GW ) Decline in Static Water Level Decline in Forest Cover
certain surface water development measures might be required to secure sound socio- economic growths. Groundwater sources in Angeles and Iloilo will be enough to meet water demand, but in other cities (including Davao)... Source: Master Plan Study on Water Resources Management in the Philippines: Final Report National Water Resources Board (NWRB), August 1998 According to the NWRB Study...
Davao City WD derives more than 99% of its water from groundwater sources... DCWD Water Sources... less than 1% from surface water.
In May 1997, NWRB issued a water permit to DCWD to use water from Tamugan River with the diversion point at Upper Baguio, Baguio District. NWRB Permit NWRB Water Permit No Wet Season = cms Dry Season = cms
Why Surface Water? 1. Expand Service Coverage 2. Improve pressure and volume of existing DCWD water consumers 3. Save on power cost 4. Avoid depletion of groundwater 5. Address increased demand for water which cannot be supplied by groundwater
Level I Level II Level II and III Level III (DCWD) Poblacion Agdao Total barangays = 182 Total barangays = 182 Served (Level III) = 106 (58%) Served (Level III) = 106 (58%) Unserved = 76 Unserved = 76Sources: City Planning and Development Office Davao City Water District Levels of Water Service
Expand Coverage Area New Water Service Connections to 30,000 households or a population of 150,000 Improve quantity and pressure of existing 160,000 connections or population of 800, Poblacion Agdao Unserved barangays Barangays to be served by TSWD Barangays served by existing water service
Surface Water Development Groundwater extraction is power-intensive... DCWD spends... PhP211 million/year for electricity... DCWD spends... PhP211 million/year for electricity... expected to increase to as much as PhP314 million in 5 years.
Why Tamugan River? 1. Enough quantity 2. Acceptable quality 3. IT IS THE ONLY RIVER in Davao City VIABLE and SUITABLE for DRINKING WATER
DAVAO CITY WATER SUPPLY PROJECT FEASIBILITY STUDY--July 2000, by NJS Consultants and CEST Inc. SURFACE WATER ASSESSMENT Lipadas River - has a superior water quality, however, the flow rate is relatively small Talomo River – contamination risk is high, reduced quantity due to hydropower plants Davao River - highly turbid, operational costs will be very high. Tagulaya and Sibulan River - rivers are outside the boundaries of Davao City. Tamugan and Panigan River - Large flow rates make these rivers desirable as water source. Water quality analysis conducted yield satisfactory results.
RECOMMENDED SURFACE WATER SOURCE Among the five bodies of water investigated, Tagulaya and Tamugan Rivers are found to be most desirable as water source for the entire Davao City. A Water Source Comparison Matrix is the result of the further investigation conducted by the Consultants. CriteriaTamugan RiverTagulaya River LocationInside Davao City Outside Davao City Water Quality Satisfactory Watershed Management Directly put under the city government Security and watershed protection will not be controlled by the City River Slope and Terrain around the intake Gentle slope and wide river bed Steep slope & narrow river bed (no space for construction of intake & transmission pipe) Based from the above evaluation of the Consultants, TAMUGAN RIVER IS THE RECOMMENDED WATER SOURCE. DAVAO CITY WATER SUPPLY PROJECT FEASIBILITY STUDY--July 2000, by NJS Consultants and CEST Inc.
Classification of Rivers Class AAPublic Water Supply Class I (for water having watersheds which are uninhabited and otherwise protected and which require only approved disinfection in order to meet the National Standards for Drinking Water of the Phils. Class APublic Water Supply Class II (for source of water supply that will require complete treatment Class BRecreational water (for primary contact recreation such as bathing, swimming and skin diving) Class CFishery water for the propagation and growth of fish and aquatic Class DFor agriculture, irrigation and livestock watering Industrial water supply Source: DENR DAO 34 series of 1990
Davao del Norte Comval Prov. Davao Oriental Davao City Davao del Sur Davao del Norte 4 rivers classified -Hijo (Class C) -Tagum (Class D) -Tuganay (Class B) -Saug (Class B) Davao City 7 rivers classified -Bunawan (C) -Davao (A & B) -Ilang (C) -Lasang (B) -Lipadas (AA,A,) -Talomo (B) -Tamugan (A) Water Quality Monitoring (Rivers Classified) (as of CY 2007): 26 & 1 DG ComVal 4 rivers classified -Agusan (C) -Kingking (C) -Naboc (C) -Matiao (C) Davao Oriental 6 rivers classified -Sumlog (A,B,C) -Baganga-Mahan-ub (AA, A & B)) -Bitanagan (Class B) -Cateel (Class A) -Dapnan (Class A) -Manurigao (Class A) Davao Gulf all classified SB Davao del Sur 5 rivers classified -Digos (B & C) -Malita (B) -Padada (D) -Sibulan (A & B) -Mainit (B) Source: DENR XI
The Tamugan Surface Water Development (TSWD) Project Infiltration Gallery Water Treatment Plant
Barangays that will benefit from the Surface Water Project Acacia 6,677 Bunawan 28,695 Callawa 1,784 Gatungan 434 Indangan 14,658 Lasang 11,297 Mahayag 1,517 Mandug 10,833 Mudiang 1,794 Tibungco 14,987 Tigatto 3,725 Sub-total 96,401 Biao Escuela 470 Biao Joaquin 425 Calinan 28,176 Gumalang 286 Lacson 1,455 New Valencia 1,340 Riverside 23,503 Talomo River 2,919 Talandang 1,302 Sub-total 59,876 Grand Total156,277 District 2 Pop. District 3 Pop.
The Conflict between DCWD and Hedcor Projects Hedcors project will threaten the citys limited water supply
Impact of Hedcor Project on DCWD TSWD Panigan River Kidale River Tamugan River 1.Operations of Hedcor will affect availability of water for DCWD resulting to dependency of DCWD on Hedcor 2.Savings of DCWD on power may be used by other power users 3.DCWD has no other surface water source DCWD Infiltration Gallery Elev. 400masl DCWD Water Treatment Plant Elev. 325masl Hedcor Weir Elev. 537masl Hedcor Weir Elev. 745masl Proposed HEDCOR Conveyance Line Junction Box Elevation MAMSL Proposed HEDCOR Pondage Elev. = MAMSL 20MW Power plant Talomo Diversion Weir Elev. 765masl Intake Weir Elev. 536masl
Hedcors Proposal DCWD Infiltration Gallery Elev. 400masl DCWD Water Treatment Plant Elev. 325masl Panigan River Kidale River Tamugan River 1.Hedcor build pumping station and pipeline to DCWD WTP at elev If water at 400masl is less than 4cms, Hedcor will pump shortfall to DCWD WTP 3.If Hedcor fails to pump, it will be penalized at DCWD selling rate 4.Conditions be stipulated in MOA, ECC, and water permit Why Proposal is not acceptable? 1.DCWD not after the penalty but reliable and continuous water supply 2.If Hedcor cannot pump due to maintenance problem, DCWD will not be able to supply water 3.DCWD will be dependent on Hedcor Hedcor Weir Elev. 537masl Hedcor Weir Elev. 745masl Proposed HEDCOR Conveyance Line Junction Box Elevation MAMSL Proposed HEDCOR Pondage Elev. = MAMSL 20MW Power plant Talomo Diversion Weir Elev. 765masl Intake Weir Elev. 536masl
Effect of Hedcor Project to Groundwater Sources The modeling results indicate that a large component of the recharge occurs along the Talomo River Isabelle M. Proulx, Talomo-Lipadas Watershed Aquifer Characterization Study: 3D Aquifer Model, PCEEM Mission Report, February 2002
Source: Terrain Analysis July 2005 Mines and Geosciences Bureau-XI
Effect of Hedcor Hydropower Project on Groundwater Resources Panigan River Kidale River Tamugan River 1.Affects the very high recharge potential for deep to very deep aquifer 2.Affects groundwater resources Talomo River Hedcor Weir Elev. 537masl Hedcor Weir Elev. 745masl 20MW Power plant Talomo Diversion Weir Elev. 765masl Intake Weir Elev. 536masl
Effect of Hedcor Project to Groundwater Sources Source: ACCESS TO CLEAN DRINKING WATER, United Nation Development Project (UNDP)/International Atomic Energy Agency (IAEA)/Regional Cooperative Agreement (RCA) Project Davao River (20%) Talomo River 80% Rivers 60% Rain 40% Dumoy Recharge Composition
Long-term effect of Hedcors Project Groundwater depletion Land subsidence Salinity Intrusion High pumping cost
DCWD Position Hedcors Hydropower plant will threaten Davao Citys present and future water supply. DCWD strongly urges that Hedcor would relocate its hydropower in other rivers. SPARE TAMUGAN!
The Impending Water Shortage and its Solution (contd.) Because of the critical role of Tamugan River to the health of Davao City residents and to the development of Davao City, it is also important to declare Tamugan River as a single purpose river, that is, solely as the source of water supply for Davao City. 6/3/ Dr. ED. B. PRANTILLA *USEP-SAEC and RECORD Foundation Conducted by PCEEM, MGB and Asia Geodyne Corporation