OFF-GRID HYDROLOGY • HARVESTING STANDARDS

IBC Tank & First-Flush Diverter Index

Catchment surface coefficients, first-flush gallon rules, and UV/sediment filtration standards for off-grid cistern systems.

Rainwater Catchment Standards
TOPIC CLUSTER DEEP-DIVES

Specialized Field Guides & Protocols

Focused operational guides solving specific long-tail challenges, material formulas, and field troubleshooting.

⚡ VERIFIED INTERACTIVE CALCULATOR

Roof Catchment Yield & Cistern Sizing Calculator

Calculate annual harvestable water volume based on roof footprint and rainfall, applying standard 0.90 runoff efficiency factor.

CALCULATED METRIC
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AUDITED STANDARDS

Standard Operating Procedures

Peer-reviewed protocols executed by certified field practitioners.

DIVERTER PROTOCOL

First-Flush Sediment & Pollen Diversion

Isolating the initial 1 to 2 gallons per 100 sq ft containing roof debris.

  • 01. Install vertical 4-inch PVC drop pipe before water enters storage cistern.
  • 02. Seat floating rubber sealing ball inside pipe; ball rises as first-flush fills.
  • 03. Incorporate slow-drip drain petcock at bottom to reset automatically between storms.
BIO-SECURITY PROTOCOL

Mosquito & Light Exclusion Seal

Preventing algae growth and insect vector breeding in potable rainwater tanks.

  • 01. Fit 1mm stainless steel insect mesh over every tank overflow and inlet opening.
  • 02. Use 100% opaque black or dark green polyethylene tanks to block 100% UV sunlight.
  • 03. Maintain overflow trap with flapper check valve to block rodent infiltration.
FILTRATION PROTOCOL

3-Stage Whole-House Pressure Purification

Treating harvested roof water for potable pressurized consumption.

  • 01. Stage 1: 20-micron pleated sediment filter to catch suspended solids.
  • 02. Stage 2: 5-micron spun polypropylene depth filter + extruded carbon block.
  • 03. Stage 3: 30 mJ/cm² high-output UV disinfection chamber to eradicate coliform bacteria.
AUDITED DATABASE

Verified Specifications Matrix

Search, filter, and inspect verified field specifications with direct audit logs.