(1) Dalam hal Bangunan Gedung dan persilnya secara teknis dan non teknis tidak dapat mengelola Air Hujan secara mandiri, pemerintah kabupaten/kota dan pemerintah provinsi DKI Jakarta harus melakukan pengelolaan Air Hujan pada skala kawasan dengan mengacu pada peraturan perundang-undangan.

(2) Pelaksanaan pengelolaan Air Hujan pada skala kawasan sebagaimana dimaksud pada ayat (1) dapat dijadikan dasar bagi pemerintah kabupaten/kota dan pemerintah provinsi DKI Jakarta dalam memberikan [[IMB]].

BAB IV establishes the comprehensive framework for rainwater management facilities and infrastructure:

A. Sarana Penampungan (Harvesting/Storage)

• Purpose: Rainwater collection for reuse
• Types: Kolam tandon, tangki air
• Applications: Domestic use, irrigation, toilet flushing
• Priority: First priority in facility selection

B. Sarana Retensi (Infiltration)

• Purpose: Groundwater recharge through infiltration
• Types:
  • Sumur Resapan (Infiltration wells)
  • Kolam Retensi (Retention ponds)
  • Biopori (Bio-pores)
  • Sumur Resapan Dalam (Deep infiltration wells)
• Requirements:
  • Soil permeability ≥ 2.0 cm/hr
  • Minimum 1.5m clearance from groundwater table
  • Spacing: 3m between wells, 1m from foundation, 5m from septic tanks
• Priority: Second priority (maximize infiltration)

C. Sarana Detensi (Temporary Detention)

• Purpose: Temporary storage to reduce peak runoff
• Types:
  • Bak/Tandon/Kolam Detensi (Detention tanks/ponds)
  • Taman Vertikal (Vertical gardens)
  • Taman Atap (Roof gardens/green roofs)
• Application: When infiltration not feasible
• Priority: Third priority (detention as alternative)

1. Saluran air hujan - Drainage channels
2. Talang air hujan - Rain gutters
3. Bak kontrol - Control tanks
4. Bak penyaring - Filter tanks
5. Pipa - Piping system
6. Kran air - Water taps

Site Considerations:

• Soil characteristics (permeability, type)
• Topography (slope, elevation)
• Groundwater level (depth, seasonal variation)
• Plot area and building coverage

Calculation Factors:

• Rainfall intensity (95th percentile or specific analysis)
• Plot area (total catchment)
• Building footprint (KDB × plot area)
• Drainage coefficient

Compliance Integration:

• Facility functionality prerequisite for [[SLF]] issuance
• Verification required for SLF renewal
• Part of building permit technical requirements

Priority 1: Maximize Utilization (Pasal 14 ayat 3a)

• Rainwater harvesting for beneficial use
• Reduces potable water demand
• Provides backup water supply

Priority 2: Maximize Infiltration (Pasal 14 ayat 3b)

• Recharge groundwater
• Maintain natural hydrological cycle
• Preferred for sites with suitable soil

Priority 3: Temporary Detention (Pasal 14 ayat 3c)

• Reduce peak runoff rate
• Alternative when infiltration not feasible
• Integration with landscape/architecture

When Individual Management Not Feasible:

• Technical constraints (soil, space, topography)
• Non-technical constraints (legal, economic)
• Government responsibility for kawasan-scale facilities

District Solutions:

• Communal infiltration basins
• Shared detention ponds
• Public green infrastructure
• Can justify IMB issuance for individual buildings

Sumur Resapan Specifications:

• Types: 4 types per SNI 03-2453-2002
• Depth: 1.5m minimum from groundwater
• Diameter: Calculated based on soil permeability
• Material: Precast concrete, brick, or natural stone

Biopori Specifications:

• Diameter: 10-30 cm
• Depth: 80-100 cm (or until groundwater)
• Spacing: 50-100 cm apart
• Maintenance: Fill with organic waste for composting

Kolam Retensi/Detensi:

• Volume calculation: Vab = 0.855 × Ctadah × Atadah × th
• Where: th = 95th percentile rainfall, Atadah = catchment area
• Design considerations: Freeboard, outlet control, vegetation

Taman Atap (Green Roofs):

• Substrate depth: 10-30 cm
• Vegetation: Drought-tolerant species
• Waterproofing: Critical consideration
• Weight loading: Structural analysis required

This chapter provides the technical foundation for facility selection, design, and implementation, with detailed specifications in the regulation's annex.

• Previous: [[PERMENPUPR_11_2014_BAB_3|BAB III - Penetapan Status Wajib Kelola]]
• Next: [[PERMENPUPR_11_2014_BAB_5|BAB V - Pembinaan]]
• Annex: [[PERMENPUPR_11_2014_LAMPIRAN|Lampiran - Technical Specifications]]
• Parent: [[PERMENPUPR_11_2014|PERMENPUPR 11/2014]]

BAB V - PEMBINAAN