Convert US gallons per day to Acre-feet per second
Convert US gallons per day (gpd) to Acre-feet per second (ac-ft/s) instantly and accurately.
Conversion Formula
ac-ft/s = gpd × 3.551948238e-11
About US gallons per day
The US gallon per day (gpd) equals 3.785411784×10⁻³/86400 ≈ 4.381×10⁻⁸ m³/s, the standard unit in US water-utility regulation and residential water-well pump sizing. The US national average residential water use is about 80-100 gpd per person; a reverse-osmosis membrane module is rated in gpd (50-100 gpd for domestic units). 1 US gpd ≈ 4.381×10⁻⁸ m³/s.
About Acre-feet per second
The acre-foot per second (ac-ft/s) equals 1233.48183754752 m³/s, an enormous unit representing the flow that would fill a football-field-sized area to 1 ft depth every second. It appears in descriptions of exceptionally large dam-break flood waves and major river-system extreme events. The 1976 Teton Dam collapse peak outflow was estimated at ≈65 000 ft³/s ≈ 1.49 ac-ft/s. 1 ac-ft/s = 1 233.48 m³/s.
Quick Reference Table
| US gallons per day (gpd) | Acre-feet per second (ac-ft/s) |
|---|---|
| 1 gpd | 3.552 × 10-11 ac-ft/s |
| 2 gpd | 7.104 × 10-11 ac-ft/s |
| 5 gpd | 1.776 × 10-10 ac-ft/s |
| 10 gpd | 3.552 × 10-10 ac-ft/s |
| 25 gpd | 8.88 × 10-10 ac-ft/s |
| 50 gpd | 1.776 × 10-9 ac-ft/s |
| 100 gpd | 3.552 × 10-9 ac-ft/s |