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.