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.

⚡ 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.

Roof Footprint Area (sq ft): 1500 sq ft

Annual Rainfall (Inches): 35 inches

CALCULATED VALUE

AUDITED STANDARDS

Peer-reviewed operational procedures executed by certified field specialists.

DIVERTER PROTOCOL

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

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

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.

SPECIFICATION DATABASE

Audited field parameters, technical tolerances, and benchmarks.