ANALISIS POTENSI RESAPAN DI DAERAH ALIRAN SUNGAI CISADANE HULU
ABSTRACT: Human disturbance
such as land use changes, urbanization, and deforestation degrade Upper Cisadane
Watershed. It also causes degradation of recharge area, decrease infiltration
and increase runoff. The aims of this research were to (1) identify the
criticality of recharge area; and (2) analyze the potentialof water recharge in
Upper Cisadane Watershed. The criticality of recharge area had been identified
refersto regulation of the Minister of Forestry, Republic of Indonesia Number:
P.32/MENHUT-II/2009 byscoring and overlaying of slope, soil type, rainfall, and
land use map. The amount of water rechargepotential was predicted by the
equation issued by IWACO and WASECO (1990). The result showed thatdistribution
of criticality of recharge area in Upper Cisadane Watershed in 2006, 2009, and
2013 were: (1) good: 24.7%, 24.7%, 23.6%; normal: 6.9%, 6.2%, 3.7%; (3) ranging
critical: 17.9%, 17.8%, 19.4%, (4) rather critical: 25.0%, 24.9%, 30.7%; (5)
critical: 23.9%, 24.5%, 22.0%; and (6) very critical: 1.9%,2.0%, 0.7%
respectively. The magnitude of the potential of water recharge on average in
the recharge area was in good condition; 154.5 x 106 m3, normal; 33.9 x 106 m3,
ranging critical; 94.6 x 106 m3, rather critical; 130.9 x 106 m3, critical;
98.2 x 106 m3, very critical; 6.2 x 106 m3. Upper Cisadane Watershed has a
potential of annual water recharge was 511.7 x 106 to 569.2 x 106 m3/year or
around 14% - 15.6% of total rainfall, with an average change in the potential
of water recharge from the simulation based on the condition of recharge area
in 2006-2009 decreased -0.04%, in 2009-2013 decreased -3.2% and in 2006-2013
decreased -3.3%.
Penulis: Radius Pranoto,
Satyanto Krido Saptomo, Roh Santoso B. Waspodo
Kode Jurnal: jptsipildd160420
