Overview

Overview

From the Magat River Multi-Purpose Project in 1978 with the construction of the Magat Dam as its main feature and the rehabilitation of the existing Magat River Irrigation System (MARIS) and Siffu River Irrigation System (SIFRIS), the Magat River Integrated Irrigation System (MARIIS) officially opened in February 1986 serving the provinces of Isabela, Quirino and the municipality of Alfonso Lista in Ifugao.

MARIIS is composed of the Magat Reservoir; three diversion dams—MARIS, Baligatan, and SIFRIS; a large number of irrigation canals; and three pumping stations to supply irrigation water for an area of 97,402 hectares.

It also includes hydro-electric power plants— the 360 MW Magat Hydro Electric Power Plant and the 6 MW Baligatan Hydro Electric Power Plant. Along the MARIS Main Canal are 2.5 MW mini-hydro-electric power plants owned and operated by the Isabela Electric Cooperative (ISELCO).

To date, MARIIS irrigates 80,847 hectares of land. For 2012, it was able to produce 831,404 metric tons of palay , an 8.7% increase from its 2011 production of 731,409 metric tons.

Divisions Firmed-up Service Area (ha) Maximum Irrigated/Planted Area Number of IAs Organized CIA's with IMT Contract Number of Farmers Served
I 20,438.22 20,301 89 12 15,577
II 25,016.00 24,014 106 15 19257
III 22,233.08 21,802 86 11 11,949
IV 19,199.89 18,867 79 13 15,029
TOTAL 86,887.19 84,984 360 51 61,812

 

General Information:

Source of Water Supply:                  Magat Reservoir and Siffu River
Official Opening of the System:       February 1986
Original Construction Cost:              P 4.2 Billion
Firmed-up Service Area:                  85,731 Hectares

 

Provinces/Towns Served:

Town Division I Division II Division III Division IV Area Served (ha)
1. Alicia 60.0 5,582   4,378 10,020
2. Angadanan 35.9 1,777   898 2,711
3. Cabatuan   2,917   2,376 5,293
4. Cauayan       7,733.88 7,734
5. Luna       2,211.68 2,212
6. Naguillian       163.45 163
7. Reina Mercedes       958.73 959
8. Ramon 3,397.85 3,991     7,389
9. Santiago City 6,971       6,971
10. San Isidro 1,508.28 2,500     4,008
11. Cordon 3,792.35       3,792
12. Echague 1,628.81       1,629
13. San Mateo   7,399 154 800 8,353
14. Aurora     2,262   2,262
15. Burgos     4,128   4,128
16. Gamu     2,096   2,096
17. Quirino     1,285   1,285
18. Roxas     4,656   4,656
19. San Manuel     6,589   6,589
Sub-Total Isabela 17,247.08 24,166 21,170 19,519.74 82,250
20. Diffun 1,535        
21. Cabarroguis 186.07        
22. Saguday 1,105.89        
Sub-Total Quirino 2,827       2,827
23. Alfonso-List     654   654
GRAND TOTAL 20,220.92 24,166 21,824 19,519.74 85,731
 
Division Capacity (cms):                                   Main Canals (km):

Mariis Main Canal (MMC)             -   121.5                   Lined Canal                -       20.186

North Diversion Canal (NDC)       -   59                        Earth Canal                -       340.15
South High Canal (SHC)                -   26
Oscariz Main Canal (OMC)            -   7.5
Length of Laterals (km)                                  Length of Farm Ditches (km)
Lined Canal                                   -   55.79                     Lined Canal               -      19.78
Earth Canal                                   -   1,138                     Earth Canal                -      3,227.22
 

Operations Performance Data

PARTICULARS 2010 2011 2012 2013 2014 2015
1. Firmed-up Service Area (FUSA), Ha 84,795 84,978 84,978 85,176 85,731 85,731
2. Irrigated/Planted            
    a. Dry 77,607 79,048 79,493 81,492 82,475 82,606
    b. Wet 78,770 80,192 79,815 81,791 79,853 82,862
    c. Ratoon     20,705 28,963    
3. Benefitted Area            
    a. Dry 53,073 74,883 78,943 76,951   79,551
    b. Wet 50,297 51,532 78,351 79,203   66,342
4. Yield per Ha (cavans)            
    a. Dry 76 105.89 106 106.91   120
    b. Wet 90 80.27 103 106.59   112
5. Cropping Intensity (%) 184 196 212 226 189 209
6. Collection Efficiency (%) 89.91 83.12 843 91.43 96.06 96.79
7. Viability Index (%) 1.18 1.45 1.80 1.74 1.55 1.49

 

Status of Irrigation Management Transfer as of June 30, 2015

Division FUSA Turned-Over O&M Contracts
Model 1 Model 2 IMT (CIA)
I 20,221 - 20,221 20,221
II 24,166 - 24,166 24,166
III 21,824 4,859 16,794 21,284
IV 19,520 665 18,855 19,520
TOTAL 85,731 5,524 80,207 85,731