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NATIONAL IRRIGATION NATIONAL IRRIGATION ADMINISTRATIONADMINISTRATION
EDSA, Diliman, Quezon City, EDSA, Diliman, Quezon City, PhilippinesPhilippines
By: DOMINADOR D. PASCUABy: DOMINADOR D. PASCUAManager, Corporate Planning StaffManager, Corporate Planning Staff
WATERWATER ALLOCATION BETWEEN
IRRIGATION AND MUNICIPAL USE
(INWEPF 4th Steering Meeting and Symposium)
Philippines: Water Resources Philippines: Water Resources RegionsRegions
Water Balance: 2005Water Balance: 2005
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
1 2 3 4 5 6 7 8 9 10 11 12
Water Resources Region
MC
M
50% probability of SW 80% probability of SW Water Demand (Case 1) Water Demand (Case 2)
Water Balance: 2025Water Balance: 2025
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
50000
1 2 3 4 5 6 7 8 9 10 11 12
Water Resources Region
MC
M
50% probabilty of SW 80% probability of SW Water Demand (Case 1) Water Demand (Case 2)
Water Resources Regions 3 & 4Water Resources Regions 3 & 4
0
20000
40000
60000
80000
100000
120000
Municipal Irrigation Power Industrial Commercial Livestock &Fisheries
Recreation
Uses of Water Based on Water Right Grantees Registered with NWRB: 2000
MCM
Location of Angat Dam, AMRIS and Location of Angat Dam, AMRIS and Metro Manila, other potential water Metro Manila, other potential water
sourcessources
Use Permitee Angat (60 cms) UATP (9 cms)
Irrigation NIA * 36 -
Municipal Water
MWSS 22 9
Power ride-on water right
NPC 58 (9)
Environmental/Tourism
DOT 2 -
Water Rights Allocation in Water Rights Allocation in Angat ReservoirAngat Reservoir
* 15 cms may be taken from the 36 cms allocation of * 15 cms may be taken from the 36 cms allocation of NIA as conditional allocation to MWSS in emergenciesNIA as conditional allocation to MWSS in emergencies
Upper rule curve – water level > 212 m Municipal water supply, irrigation demands, instream river
flow requirements satisfied Power generated at capacity of hydropower plants
Lower rule curve – water level < 180 m Municipal water supply satisfied first Power generation linited to releases made from auxiliary
hydropower plants Irrigation water maybe reduced and satisfied by whatever
water remains from the reservoir or obtainable from local inflows
Between the upper and lower rule curves – water level = 212 m to 180 m
Municipal water supply and irrigation demands satisfied Power generation limited to releases for municipal water
supply and irrigation
Operation rule in Angat Reservoir
Consequences of realloction in AMRIS
Year EffectArea
Affected (ha)Foregone Paddy Production (MT)
1997-1998
Suspension of dry season
operation24,200 121,000
2004
DS-some areas not
planted and water-
stressed
3,930 14,911
2004
WS-reduced production in some areas; other areas not planted
16,000 39,000
Compensation Claims
YearAmount
(Million Pesos)
Farmers (paddy production)
1997-1998 968
2004 500
NIA (irrigation fee collection)
1998 29
2004 20
*exchange of communications: NIA, NWRB, MWSS
*claims referred to OGCC in 2006
The Water Code does not provide clear
guidelines on the Compensation for water reallocated
Means to meet Metro Manila’s increasing demand for municipal water Develop new sources Improve water use efficiency
ConclusionsConclusions
Thank you and good day.Thank you and good day.