Economic Valuation of Water Resources Gunung Gede Pangrango National Park

Valuation of Mt Gede Pangrango National Park (Wiratno; Sasmitawidjaja, Virza ; Kushardanto, H; Lubis, Saut M. 2004.)

Tabel. Economic Valuation of Water Resources for Paddy Field Irrigation

No.	Figure	Calculation	Result
1	Annual water demand	Area of paddy field x season(s) x water requirement (2,620 x 2) + (934 x 1) + (5,209 x 2) + (4,885 x 3) x 125,000	3,89 billion m3
2	Water price		0.27 Rp/m3
3	Annual value of water	Water demand x water price	1.05 billion/year
4	NPV 10 %	Over 25 years, constant price	9.53 billion Rp

Note:

-      Danudoro (1993) menghitung dengan analisis remote sensing image (TM Image) bahwa luas areal persawahan di transisi zone adalah 10.998 hektar, dengan 2,620 ha berada di Upper Ciliwung.  Dari 10.998 hektar lahan padi, maka 934 hektar panen untuk 1 kali musim, 5.209 hektar panen 2 kali dalam 1 musim, dan 4.885 hektar panen 3 kali dalam 1 musim. 

-      Dumairy (1992) dalam Widarti (1995) prediksi kebutuhan air untuk persawahan adalah 125.000 m3/ha/musim.

Tabel Economic Valuation of Water Resources for Household Consumption

No.	Figure	Calculation	Result
1	Water demand	Number of household (hh) X water demand/per household 34,689 hh x 204.6 m3/year/hh	7,097,369 m3
2	Water price		268 Rp/m3
3	Value of water	Water demand x water price	1.90 billion Rp
4	NPV 10 %	Over 25 years, constant price	17.28 billion Rp

Note: Willingness to pay (WTP) of Water = 268 Rp/m3