Im building an RV park in Mexico and need t build a septic tank for 35 plus restaurant. How big must I build my septic tank? I was thinking 5 meters by 1o meters by 2meters deep. We arfe on a hill and we will drain down some 49 feet upabove where the septic tank will be. Any advice? Thanks Surfer sandy:)

TANK SIZE TABLE - Table of Required Septic Tank Size Based on Daily Water Usage
Table of Required Septic Tank Size for Daily Water Usage Volume in Gallons
Average Sewage Wastewater
Flow - Gallons Per Day Minimum Gallons of
Effective Capacity Needed (1)
0-500 900 gallon septic tank
601-700 1200 gallon septic tank
801-900 1500 gallon septic tank
1001-1240 1900 gallon septic tank
2001-2500 3200 gallon septic tank
4501-5000 5800 gallon septic tank
First you must figure your usage per day.
You will also need to install a grease trap.