Based on the Kentucky Administrative Regulations (902 KAR 10:085), it is assumed that for each bedroom of a house 120 gallons of waste will be produced per day. If we assume that the house has 4 bedrooms, this would mean that a septic system has to be designed to handle 480 gallons of waste/day. To be safe and ensure that we don’t overload our system, we are going to design for 500 gallons of waste/day.
A good septic system design, not only includes the tank, but the leach field which is intended to disperse the water and allow it to percolate through the soil media which allows for further treatment of the flow. It is this leach field that you will be asked to design for this project.
Step 1: Based on our design flow use EXCEL to complete the following table:
|Linear Ft. Per Gallon
|Total Linear Feet of Drain Required
Step 2: The area in Letcher County with which we are most concerned has a mostly silt based soil. 902 KAR 10:085 states that lateral trenches two (2) feet wide or less must be spaced on eight (8) foot centers, meaning that the center point of 1 trench to the center point of the second trench must be separated by eight (8) feet. It also states that the maximum length of for individual trenches can be no more than 200 feet. To make this easy we are going to assume that we can use the maximum trench length in our design. To meet the regulations what is the minimum area required to build the leach field?
Step 3: Pretend that you are working for an engineering company. Your boss has requested that you write a short, professional memo which provides the completed table from step 1, your required leach field size from step 2, and wants you to indicate whether using a septic system and leach field in this silt based soil is a good idea. The justification for your decision to use a septic system or not must be based on good engineering judgment and defended using sound engineering/scientific sources. These sources must be cited and referenced properly. This memo should be no more than 2 pages long and should be professional.
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