Answer Key: Self-Test D-1.5

1. Figure 2P-4

Table 1 Answers
Number	Name	Fixture Units	Size
1	Fixture drain	2	2 in.
2	Fixture drain	3	2 in.
3	Branch	5	2 in.
4	Fixture drain	3	2 in.
5	Branch	8	3 in.
6	Fixture drain	3	2 in.
7	Branch	11	3 in.
8	Trap arm — Fixture drain	1	1.25 in.
9	Branch	2	1.25 in.
10	Branch	13	3 in.
11	Trap arm — Fixture drain	1	1.25 in.
12	Branch	2	1.25 in.
13	Branch	15	3 in.

2. Figure 2P-5

Table 2 Answers
Number	Name	Fixture Units	Size
1	Fixture drain	6.34	3 in.
2	Trap arm — Fixture drain	4	2 in.
3	Branch	8	3 in.
4	Branch	14.34	3 in.
5	Branch	7	3 in.
6	Stack	21.34	4 in.
7	Branch	8	3 in.
8	Fixture drain	3	2 in.
9	Stack	32.34	4 in.
10	Branch	9	3 in.
11	Trap arm — Fixture drain	6	3 in.
12	Branch	21	3 in.
13	Branch	27	4 in.
14	Branch	32	4 in.
15	Branch	1	1.25 in.
16	Stack	65.34	4 in.
17	Sanitary building drain	65.34	4 in.
18	Sanitary building sewer	65.34	4 in.

3. Figure 2P-6

Table 3 Answers
Number	Name	Fixture Units	Size
1	Branch	8	3 in.
2	Branch	11	3 in.
3	Branch	13	3 in.
4	Stack	13	3 in.
5	Branch	4.5	2 in.
6	Branch	8.5	3 in.
7	Stack	22	3 in.
8	Branch	6	2 in.
9	Branch	15	3 in.
10	Branch	7	3 in.
11	Stack	44	4 in.
12	Branch	8	3 in.
13	Branch	20	3 in.
14	Branch	10	3 in.
15	Branch	13	3 in.
16	Branch	32.02	4 in.
17	Branch	51.04	4 in.
18	Stack	119.04	4 in.
19	Branch	4	2 in.
20	Branch	7.5	3 in.
21	Branch	8	3 in.
22	Branch	16	3 in.
23	Branch	24	3 in.
24	Branch	32	4 in.
25	Fixture drain	4	3 in.
26	Branch	16	4 in.
27	Branch	24	4 in.
28	Stack	183.54	4 in.
29	Sanitary building drain	183.54	4 in.
30	Sanitary building sewer	183.54	4 in.

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Block D: Drainage Systems Copyright © 2025 by Skilled Trades BC, Thompson Rivers University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.