3Outline Background Looming Water Crisis Why Surface Water Why Tamugan RiverConflict between Power and Water ProjectsDCWD Position
4Background UN Secretary General Ban Ki-moon “. . .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.”
5NATIONAL WATER RESOURCES BOARD BackgroundNATIONAL WATER RESOURCES BOARDNWRB says. . .“Davao City is one of the nine water-critical urbanized areas in the Philippines where water is consumed intensively.”
7Water Demand and Groundwater Potential in Selected 9 Major Urban Areas Major CityExploitable Groundwater (MCM/ year)Water Demand (MCM/year)Ratio of Demand in 2025 to Demand in 199519952025Metro Manila1911,0682,8832.7Metro Cebu60593425.8Davao City84501533.1Baguio City1512877.3Angeles City13711312.8Bacolod City103371113.0Iloilo City809475.2Cagayan de Oro City3429983.4Zamboanga City5428203Source: Master Plan Study on Water Resources Management in the Philippines: Final ReportNational Water Resources Board (NWRB), August 1998
8Projected residual volume of GW in the Talomo-Lipadas Watershed YEARGWR (MLD)GWU(MLD)RESIDUAL (MLD)1997280.5134.61145.82001163.68116.822005199.0381.472009242.0338.472013294.30-13.802017357.87-77.3720110.0Source: Asia-Geodyne Corporation, commissioned by DENR XI, MEIP and World Bank
9Drop in Static Water Level UponDrilling30 out of 43Wells areFree-flowing3.25 meters for9 wellsSources: C. Lotti-LWUA Study andDCWD ECD and PD
10Decline in Forest Cover 1987 – 6,170 hectaresSource: State of Talomo-Lipadas Watershed: A Report, by PCEEM, 2006
11Decline in Forest Cover 2002 – 2,593 hectaresSource: State of Talomo-Lipadas Watershed: A Report, by PCEEM, 2006
12Bases 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 LevelDecline in Forest Cover
13According to the NWRB Study. . . Groundwater sources in Angeles and Iloilo will be enough to meet water demand, but in other cities (including Davao). . .“certain surface water development measures might be required to secure sound socio-economic growths.”Source: Master Plan Study on Water Resources Management in the Philippines: Final ReportNational Water Resources Board (NWRB), August 1998
14DCWD Water SourcesDavao City WD derives more than 99% of its water from groundwater sources. . .. . . less than 1% from surface water.
15NWRB PermitIn 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 Water Permit NoWet Season = cmsDry Season = cms
16Why Surface Water? Expand Service Coverage Improve pressure and volume of existing DCWD water consumersSave on power costAvoid depletion of groundwaterAddress increased demand for water which cannot be supplied by groundwater
17Levels of Water Service 483462238645115113905997277411131253610339405102181979Poblacion512837715717924410352110801554322111117968551607085811065083241051173016101786514360207546771495669886415873257699371641591671721613588696394107873167568284615817517396424916839361082622116891049338911141004129410947162112Agdao17772Level ILevel IILevel II and IIILevel III (DCWD)Total barangays = 182Served (Level III) = 106 (58%)Unserved = 76Sources:City Planning and Development OfficeDavao City Water District
18Expand Coverage Area17924410352110801554322111117968551607085811065083241051173016101786514360207546771495669886415873257699371641591671721613588696394107873167568284615817517396424916839361082622116891049338911141004129410947162483462238645511151139059972774177281123711131253610339405102187271571979PoblacionAgdaoNew Water Service Connections to 30,000 households or a population of 150,000Improve quantity and pressure of existing 160,000 connections or population of 800,000Unserved barangaysBarangays to be served by TSWDBarangays served by existing water service
19Surface Water Development Groundwater extraction is power-intensive . . .DCWD spends. . .PhP211 million/year for electricity. . .expected to increase to as much as PhP314 million in 5 years.
20Why Tamugan River? Enough quantity Acceptable quality IT IS THE ONLY RIVER in Davao City VIABLE and SUITABLE for DRINKING WATER
21DAVAO CITY WATER SUPPLY PROJECT FEASIBILITY STUDY--July 2000, by NJS Consultants and CEST Inc. SURFACE WATER ASSESSMENTLipadas River - has a superior water quality, however, the flow rate is relatively smallTalomo River – contamination risk is high, reduced quantity due to hydropower plantsDavao 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.
22DAVAO CITY WATER SUPPLY PROJECT FEASIBILITY STUDY--July 2000, by NJS Consultants and CEST Inc. RECOMMENDED SURFACE WATER SOURCEAmong 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 RiverLocationInside Davao CityOutside Davao CityWater QualitySatisfactoryWatershed ManagementDirectly put under the city governmentSecurity and watershed protection will not be controlled by the CityRiver Slope and Terrain around the intakeGentle slope and wide river bedSteep 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.
23Classification of Rivers Class AA Public 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 A Public Water Supply Class II (for source of water supply that will require complete treatmentClass B Recreational water (for primary contact recreation such as bathing, swimming and skin diving)Class C Fishery water for the propagation and growth of fish and aquaticClass D For agriculture, irrigation and livestock wateringIndustrial water supplySource: DENR DAO 34 series of 1990
24Water Quality Monitoring (Rivers Classified) Davaodel NorteComval Prov.Davao OrientalDavao CityDavao del SurDavao del Norte4 rivers classifiedHijo (Class C)Tagum (Class D)Tuganay (Class B)Saug (Class B)ComVal4 rivers classifiedAgusan (C)Kingking (C)Naboc (C)Matiao (C)Davao City7 rivers classified-Bunawan (C)Davao (A & B)Ilang (C)Lasang (B)Lipadas (AA,A,)Talomo (B)Tamugan (A)Davao Oriental6 rivers classifiedSumlog (A,B,C)Baganga-Mahan-ub(AA, A & B))Bitanagan (Class B)Cateel (Class A)Dapnan (Class A)Manurigao (Class A)Davao del Sur5 rivers classifiedDigos (B & C)Malita (B)Padada (D)Sibulan (A & B)Mainit (B)Davao Gulf all classified SBWater Quality Monitoring (Rivers Classified)(as of CY 2007): 26 & 1 DGSource: DENR XI
25The Tamugan Surface Water Development (TSWD) Project Water Treatment PlantInfiltration Gallery
26Barangays that will benefit from the Surface Water Project District Pop.District Pop.Acacia6,677Bunawan28,695Callawa1,784Gatungan434Indangan14,658Lasang11,297Mahayag1,517Mandug10,833Mudiang1,794Tibungco14,987Tigatto3,725Sub-total96,401Biao Escuela470Biao Joaquin425Calinan28,176Gumalang286Lacson1,455New Valencia1,340Riverside23,503Talomo River2,919Talandang1,302Sub-total59,876Grand Total156,277
27The Conflict between DCWD and Hedcor Projects Hedcor’s project will threaten the city’s limited water supply
28Impact of Hedcor Project on DCWD TSWD Hedcor WeirElev. 537maslElev. 745maslProposed HEDCOR ConveyanceLine Junction Box Location@ Elevation MAMSLProposed HEDCOR Pondage Elev. = MAMSL20MW Power plantTalomo Diversion WeirElev. 765maslIntake WeirElev. 536maslDCWD Water Treatment PlantElev. 325maslDCWD Infiltration GalleryElev. 400maslTamugan RiverKidale RiverPanigan RiverOperations of Hedcor will affect availability of water for DCWD resulting to dependency of DCWD on HedcorSavings of DCWD on power may be used by other power usersDCWD has no other surface water source
29DCWD Water Treatment Plant DCWD Infiltration Gallery Hedcor’s ProposalDCWD Water Treatment PlantElev. 325maslHedcor WeirElev. 537maslElev. 745maslProposed HEDCOR ConveyanceLine Junction Box Location@ Elevation MAMSLProposed HEDCOR Pondage Elev. = MAMSL20MW Power plantTalomo Diversion WeirElev. 765maslIntake WeirElev. 536maslDCWD Infiltration GalleryElev. 400maslTamugan RiverKidale RiverPanigan RiverWhy Proposal is not acceptable?DCWD not after the penalty but reliable and continuous water supplyIf Hedcor cannot pump due to maintenance problem, DCWD will not be able to supply waterDCWD will be dependent on HedcorHedcor build pumping station and pipeline to DCWD WTP at elev. 325If water at 400masl is less than 4cms, Hedcor will pump shortfall to DCWD WTPIf Hedcor fails to pump, it will be penalized at DCWD selling rateConditions be stipulated in MOA, ECC, and water permit
30Effect 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
31Source: Terrain Analysis July 2005Mines and Geosciences Bureau-XI
32Effect of Hedcor Hydropower Project on Groundwater Resources 20MW Power plantTamugan RiverKidale RiverHedcor WeirElev. 537maslIntake WeirElev. 536maslTalomo RiverPanigan RiverHedcor WeirElev. 745maslTalomo Diversion WeirElev. 765maslAffects the very high recharge potential for deep to very deep aquiferAffects groundwater resources
33Effect of Hedcor Project to Groundwater Sources Dumoy Recharge CompositionDavao River(20%)Rivers60%Rain40%Source: “ACCESS TO CLEAN DRINKING WATER”, United Nation Development Project (UNDP)/International Atomic Energy Agency (IAEA)/Regional Cooperative Agreement (RCA) ProjectTalomo River80%
35SPARE TAMUGAN! DCWD Position Hedcor’s Hydropower plant will threaten Davao City’s present and future water supply. DCWD strongly urges that Hedcor would relocate its hydropower in other rivers.SPARE TAMUGAN!
36The Impending Water Shortage and its Solution (cont’d.) “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”.Conducted by PCEEM, MGB and Asia Geodyne CorporationDr. ED. B. PRANTILLA*USEP-SAEC and RECORD Foundation363/31/2017