... EPA’s 20 05 document Protecting Water Resources with Higher-Density Development. At one house per acre, 80, 000 houses require 80, 000 acres, or 8 water-sheds, translating to: 80, 000 acres ... Protection Agency (1 807 -T) Washington, DC 204 60 Official Business Penalty for Private Use $ 300 EPA 231-B- 05 - 00 2 December 20 05 www.epa.gov/smartgrowth 2Recycled/Recyclable Printed with vegetable ... house x 18, 700 ft3 /yr of runoff 1.496 billion ft3 /yr of stormwater runoff 8 watersheds at 20 percent impervious cover At four houses per acre, 80, 000 houses require 20, 000 acres, or...