UM extension on Septic Tanks [1]
10-60 minutes per inch (MPI) is ideal. Expect higher end for clay soils. [2]
Leach field size table based on MPI [3]
- 200 GPD design of Rosebud 2000 requires 200 feet for MPI of 50 for Armstrong clay loam https://www.acres.co/plat-map/soils?lat=39.9371797&zoom=17.14&lng=-94.8449128]
Water efficient home - https://extension.psu.edu/water-system-planning-estimating-water-needs - 50-100 gpd per person is the standard. Seed Eco-home cuts that down by a factor of 4.
- Dishwasher saves 13 gallons per day [4]. Energy star is 4 gallons per wash [5]
- Washer saves 10 gallons per wash. using about 10 gallons [6]
- Bricor UltraMaxx is 0,56 gpm or 5 gallons per shower instead of 2.5 gpm [7] saves 20-5=15 gallons per person per day [8]
- Niagara Stealth [9] toilet saves 0.8 gpf - 4 gallons per person per day [10]
- Total above is 13-25 gpd per person, about 4x less than typical.
Seed Eco-Home 1000 would require 50-100 gpd for 2-4 people
Seed Eco-Home 2000 would require 100-200 gpd for 4-8 people

Links

Perc Test