Rainwater Harvesting

Rainwater Harvesting is made for beginners who want to collect rainwater at home — homeowners and gardeners with no engineering background. It is a field manual you can actually follow. It takes you from your roof to a safe, healthy tank in ten clear plates, sizes the system from your own numbers, and keeps it running for years.

Unlike a stand-alone calculator or a how-to article, it ties the sizing math to a guided build and a maintenance tracker for your own system, so the numbers, the steps and the upkeep all describe the same tank.

SIZE IT FROM YOUR OWN ROOF
Enter your roof size, roof type and local rainfall. The calculator turns them into gallons a year, a first-flush size, a recommended tank and how much of your garden, toilets or laundry that water can cover, using the standard published formulas. Every number is an estimate, and it says so.

BUILD IT ONE PLATE AT A TIME
Ten guided plates walk from catchment to distribution, including the four steps most beginners miss: a prefilter, a calming inlet, a floating intake and a skimming overflow. The Watershed diagram builds itself and fills with water as you go, and each plate earns a Guardian Seal.

KEEP IT RUNNING
A maintenance tracker gives next-due dates, seasonal checklists and an optional reminder on the day a job is due. An equipment log tracks parts, costs and replacement dates.

KNOW THE RULES WHERE YOU LIVE
Check your state's rainwater rules and incentives, browse ideas for using the water ranked by savings, and read the safety guide. Harvested rainwater is not drinking water by default, and the app never says otherwise.

FREE, NO ACCOUNT NEEDED
The calculator, savings estimates, saved scenarios, Plate 01, the state-rules check, water-use ideas and the safety guide are free and work without an account. An account only backs your system up and carries it to another device.

RAINWATER HARVESTING PRO
An optional auto-renewing subscription, monthly or yearly, with a 7-day free trial, unlocks Plates 02-10, Guardian progression, the maintenance tracker with reminders and the equipment log. Payment is charged to your Apple ID at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the period ends. Manage or cancel any time in your App Store account settings.

Educational guidance only: always check your local codes and health department.

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