Water Demand and Catchment Scale

Used in

• Chapter 5 Making Ground
• Chapter 18 The Village

In the Numbers

Water for house and herd

In the Workshop

The well

The rows that check it

• 8 confirmed
• 0 marked for safety

• G15 confirmed Berlin rainfall 539 to 618 mm, mean about 591 on 167 rainy days; July 75 mm, February 36; comparable to London
• G18 confirmed The Spree ran for a century on water pumped from the Lusatian lignite pits and shrinks as they close; Berlin drinks mainly bank-filtered river water; the 2018 to 2023 drought
• G46 confirmed Roof yield about 480 l/m²/yr (591 mm × 0.9 runoff × 0.9 pre-filter); a 150 m² roof gives about 70 m³; four people at 50 l/day need 73 m³
• G47 confirmed Vegetables on sand take about 4 l/m²/day at peak, about 600 l/m² over 150 days; May to September rain about 300 mm; deficit about 300 l/m²
• G48 confirmed DIN 1989-1 sizes a rainwater tank for a 21-day dry spell; bury 80 to 115 cm; bentonite sealing 5 to 15 kg/m² into the top 150 mm, sodium bentonite swells 15 to 20 times; unlined …
• J29 confirmed 122 is an industrial model (1,000 covers, 2,000 l milk, 20 cows, 30 pigs, 200 hens); its farm figures cite "unknown_url"; no per-person or per-animal litres; roof yield 591 × 0.9 …
• J34 confirmed 122's 0.5 ha at 20,000 l/day for 150 days needs 4.1 ha of roof; a well would need ~1,700 lifts a day; the garden is not irrigated (Ch 5)
• J45 confirmed Honest Broker's findings: 117 half-cited to library PDF 24, diet from fitness blogs, calories from a protein shop, pasture short for its goats at low yield; 131 from …

In the Index

Water Milk, butter and cheese The kitchen and its dishes