Rainwater Monthly Balance Workbook
This workbook is for anyone comparing roof catchment, rainfall, and water use month by month. It includes a rainwater monthly balance table with columns for Month, Rain (in), Roof area (sq ft), Coefficient, Collected (gal), Use (gal), and Surplus or shortfall. The sheet already shows sample rows for Jan, Feb, and Mar with a 1500 sq ft roof, 0.85 coefficient, and 1200 gal use.
Free printable · PDF
- 1 page
- US Letter, landscape — choose “Fit to page” for A4
- PDF, 53 KB
Free for personal, family and classroom use.
Enter your roof area, runoff coefficient, monthly rainfall, and monthly water use. The collection amount calculates automatically, so you can see where each month ends with extra water or a deficit. Use it to compare seasons, test different roof sizes, or check how changing rainfall affects your supply.
Good for
- Check monthly roof water supply
- Compare rainfall to household use
- Spot seasonal surplus or shortfall
Tip: Print in landscape so the full monthly table stays easy to read.
4 files · XLSX, PDF, DOCX
Get every sheet: Rainwater Harvesting Planner
This sheet plus 3 more in one download, with the editable Excel and Word files. Excel rainwater balance workbook, a tank sizing comparison sheet, a system maintenance checklist and a water use log.
$5.00 USD, one-time 4 files · about $1.25 each
- Instant download
- 7-day refund
- Secure checkout by Stripe
7-day money-back guarantee. Full refund within 7 days of purchase, even after you download.
Printable Rainwater Tank Comparison Sheet
Printable Rainwater System Maintenance Checklist
Printable Rainwater Use Log