“TINHORN CULVERT CORRUGATED METAL PIPE PLASTIC STEEL”
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In the picture above, we replaced a single 36″ cmp with 1-36″ n-12 and 2-30″ n-12 on 2% grade, and increased the flow 5X!
| 2021 FLOW CHART | GPM’S | GPM’S | GPM’S | |||||
| pcs | Dia. | CMP | Grade .01% | Grade 1.5% | C.F.S. @ 1.5% | Grade 2% | C.F.S. @ 2% | Grade 2.5 % |
| n-12 DW | 20′ = 0″ | 20′ = 3.6″ | 20′ = 4.8″ | 20′ = 6″ | ||||
| 1 | 12″ | cmp | 123 gpm | 1500 gpm | 3.34 | 1733 gpm | 3.86 | 1938 gpm |
| 1 | 12″ | n-12 | 173 gpm | 2125 gpm | 4.74 | 2455 gpm | 5.47 | 2745 gpm |
| 1 | 15″ | cmp | 187 gpm | 2312 gpm | 5.15 | 2676 gpm | 5.96 | 2989 gpm |
| 1 | 15″ | n-12 | 314 gpm | 3859 gpm | 8.6 | 4454 gpm | 9.92 | 4982 gpm |
| 1 | 18″ | cmp | 309 gpm | 3758 gpm | 8.37 | 4344 gpm | 9.68 | 4851 gpm |
| 1 | 18″ | n-12 | 515 gpm | 6271 gpm | 14 | 7238 gpm | 16.13 | 8094 gpm |
| 1 | 21″ | cmp | 464 gpm | 5676 gpm | 12.65 | 6550 gpm | 14.59 | 7227 gpm |
| 1 | 24″ | cmp | 663 gpm | 8104 gpm | 18 | 9358 gpm | 20.85 | 10457 gpm |
| 1 | 24″ | n-12 | 1099 gpm | 13501 gpm | 30 | 15587 gpm | 34.73 | 17419 gpm |
| 1 | 30″ | cmp | 1189 gpm | 14688 gpm | 32.73 | 16956 gpm | 37.78 | 18960 gpm |
| 1 | 30″ | n-12 | 2004 gpm | 24465 gpm | 54.51 | 28253 gpm | 62.95 | 31600 gpm |
| 1 | 36″ | cmp | 1934 gpm | 23877 gpm | 53 | 27587 gpm | 61 | 30822 gpm |
| 1 | 36″ | n-12 | 3234 gpm | 39796 gpm | 89 | 45947 gpm | 102 | 51370 gpm |
| 1 | 42″ | cmp | 2935 gpm | 36039 gpm | 80.3 | 41607 gpm | 92.7 | 46527 gpm |
| 1 | 42″ | n-12 | 4921 gpm | 60036 gpm | 133.76 | 69316 gpm | 154.44 | 77517 gpm |
| 1 | 48″ | cmp | 4228 gpm | 51412 gpm | 114.55 | 59417 gpm | 132.38 | 66407 gpm |
| 1 | 48″ | n-12 | 6990 gpm | 85743 gpm | 191 | 98991 gpm | 220.55 | 110660 gpm |
| 1 | 60″ | cmp | 7575 gpm | 93280 gpm | 207.83 | 107726 gpm | 240 | 120409 gpm |
| 1 | 60″ | n-12 | 12684 gpm | 155466 gpm | 346.38 | 179513 gpm | 400 | 200653 gpm |
| 1 | 72″ | cmp | 12430 gpm | 151700 gpm | 338 | 175165 gpm | 390 | 195840 gpm |
| 1 | 84″ | cmp | 18645 gpm | 228751 gpm | 510 | 264143 gpm | 588 | 295391 gpm |
| 1 | 96″ | cmp | 26608 gpm | 326738 gpm | 728 | 377248 gpm | 840 | 421670 gpm |
| 1 | 108″ | cmp | 36530 gpm | 447204 gpm | 996 | 516553 gpm | 1151 | 577341 gpm |
| 1 | 120″ | cmp | 48269 gpm | 592269 gpm | 1320 | 683875 gpm | 1524 | 764560 gpm |
Legend:
cmp = corrugated metal pipe, requires 2.5% minimum grade for proper installation.
n-12 = n-12 double wall polyethylene pipe, n-12 recommended minimum grade is 2%.
gpm = gallons per minute.
c.f.s. = cubic feet per second.
How important is setting the pipe on the proper grade?
Compare the volume (gpm) between 0% grade vs. the recommended grade to see the results.
Note: Maximum performance results from proper installation, which requires setting the pipe at least to the minimum recommended grade.
In the picture above, we replaced a single 36″ cmp with 1-36″ n-12 and 2-30″ n-12 on 2% grade, and increased the flow 5X!
Please use the flow chart tool to take advantage of the potential to install your pipe for maximum performance.