Rainwater Harvesting for the Garden: Roof Catchment, Monthly Yield, Garden Water Demand, Tank Sizing, Overflow Days & Payback
Size a rain barrel or garden tank from your own numbers: roof area and rainfall, monthly yield, how much the beds and lawn need, a daily tank balance with overflow and empty days, pump times and the money saved, with every cell checked as you go.
One-time payment · lifetime access · lessons, labs, exam and certificate included · no subscription.
About this course
In this course you plan a rainwater system for a garden with your own spreadsheet. You turn roof plan areas and rainfall into litres with runoff factors, build a monthly yield with first-flush losses and convert the watering needs of beds, lawn and pots into litres per month. A daily tank balance shows the level, overflow and empty days; a sizing table compares 300 to 3,000 litre tanks by coverage and cost per 1,000 litres. You also handle several downpipes and tanks in series, pump and hose watering times, and the savings and payback of a tank. Garden use only, not drinking water; all numbers are fictional.
Lessons
- Roof Catchment: Plan Area, Runoff Factor & Litres per Year Pro
- Monthly Yield & First-Flush Losses Pro
- Garden Water Demand: Beds, Lawn & Pots Month by Month Pro
- Daily Tank Balance: Inflow, Use, Overflow & Empty Days Pro
- Tank Sizing: 300, 1,000, 2,000 or 3,000 Litres? Pro
- Several Downpipes & Tanks in Series Pro
- Pumps & Hoses: Watering Time per Bed and Pump Running Time Pro
- Savings & Payback: What the Rainwater Is Worth Pro