What is the minimum size septic tank for an apartment building with 12 one-bedroom units, 4 two-bedroom units, and 2 three-bedroom units?
What is the minimum size septic tank for an apartment building with 12 one-bedroom units, 4 two-bedroom units, and 2 three-bedroom units?
Hint 1: Table 10.8 in the textbook. Or see below.
Hint 2: Begin by determining the total number of units. If the total number of units exceeds 10 (which is the threshold value mentioned in Table 10.8), then calculate the demand for these additional units based on the numbers for "extra unit" and "extra bedroom." For example, if there is an additional 3-bedroom unit in addition to the initial 10 units, you will require an additional 550 Gallons in tank capacity (calculated as 250 Gal for each unit plus 2 times 150 Gal for each bedroom).
Example, you have 11 1-b, 2 2-b, and 3 3-b. Your thinking process would be:
1. The total number of units = 11 + 2 + 3 = 16 > 10. You will need to have a base of 3500 Gallons.
2. For the units that exceed 10, you need to separate consider them. For the 11 1-b, you got 1 extra 1-b [11 - 1 = 10]. So you will need to add 250 Gal * 1.
3. The 2 2-b units both falls outside of the 10-unit limit, you need to consider [250 + 150 for one additional bedroom other the 1-bedroom] * 2 units = 400 * 2 = 800 gallons.
4. For the 3 3-b units, similarly, you need to add [250 + 150 * 2] * 3 units = 550 * 3 = 1650.
5. Your final answer will be 3500 [base] + 250 [1 extra 1-b unit] + 800 [2 extra 2-b units] + 1650 [3 extra 3-b units] = 6200 gallons.
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