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> Interceptor > System Design > Channel Design
Channel Design
PolyDrain channels closely match the hydraulic requirements of urban roadway drainage. In roadway design, the channels can evacuate up to 8' of gutter width (or spread) intercepted by the grates. To determine the largest channel size required to convey the anticipated flows, K-values have been developed for each channel. These are a simplification of Manning's Equation.
Tables A, B, and C lists these values in terms of m3/s and cfs.
Notes: K-Values based on Manning Roughness coefficient n=0.010. Subtract 25mm (1 in) from depths shown to obtain invert elevations.
TABLE A — Channel with Interceptor Frame and Grate
| Overall Channel Depth | Hyd. Flow | |||
|---|---|---|---|---|
| cm (in) | Constant (K) | Weight | ||
| Part # | Minimum | Maximum | cms (cfs) | kg (lbs) |
| 010 | 15.9 (6.3) | 16.5 (6.5) | 0.124 (4.39) | 14.1 (31) |
| 020 | 16.5 (6.5) | 17.1 (6.7) | 0.132 (4.66) | 14.9 (33) |
| 021 | 17.1 (6.7) | 17.1 (6.7) | — | 14.5 (32) |
| 030 | 17.1 (6.7) | 17.7 (7.0) | 0.140 (4.93) | 15.3 (34) |
| 040 | 17.7 (7.0) | 18.3 (7.2) | 0.1472 (5.20) | 15.6 (34) |
| 050 | 18.3 (7.2) | 18.9 (7.4) | 0.1549 (5.47) | 15.4 (34) |
| 060 | 18.9 (7.4) | 19.5 (7.7) | 0.1626 (5.74) | 16.0 (35) |
| 070 | 19.5 (7.7) | 20.1 (7.9) | 0.170 (6.01) | 16.5 (36) |
| 080 | 20.1 (7.9) | 20.7 (8.1) | 0.1779 (6.28) | 16.8 (37) |
| 090 | 20.7 (8.1) | 21.3 (8.4) | 0.1856 (6.55) | 17.3 (38) |
| 091 | 21.3 (8.4) | 21.3 (8.4) | — | 17.0 (37) |
| 096 | 21.3 (8.4) | 21.3 (8.4) | — | 9.7 (21) |
| 100 | 21.3 (8.4) | 21.9 (8.6) | 0.1933 (6.83) | 17.1 (38) |
| 110 | 21.9 (8.6) | 22.5 (8.9) | 0.2011 (7.10) | 18.1 (40) |
| 120 | 22.5 (8.9) | 23.1 (9.1) | 0.2088 (7.37) | 18.5 (41) |
| 130 | 23.1 (9.1) | 23.7 (9.3) | 0.2165 (7.65) | 19.3 (42) |
| 140 | 23.7 (9.3) | 24.3 (9.6) | 0.2243 (7.92) | 19.5 (43) |
| 150 | 24.3 (9.6) | 24.9 (9.8) | 0.232 (8.19) | 19.4 (43) |
| 160 | 24.9 (9.8) | 25.5 (10.0) | 0.240 (8.47) | 20.1 (44) |
| 170 | 25.5 (10.0) | 26.1 (10.3) | 0.2475 (8.74) | 20.5 (45) |
| 180 | 26.1 (10.3) | 26.7 (10.5) | 0.2553 (9.02) | 21.0 (46) |
| 190 | 26.7 (10.5) | 27.3 (10.7) | 0.2631 (9.29) | 21.3 (47) |
| 191 | 27.3 (10.7) | 27.3 (10.7) | — | 21.2 (47) |
| 200 | 27.3 (10.7) | 27.9 (11.0) | 0.2709 (9.56) | 21.3 (47) |
| 210 | 27.9 (11.0) | 28.5 (11.2) | 0.2786 (9.84) | 22.1 (49) |
| 220 | 28.5 (11.2) | 29.1 (11.5) | 0.2864 (10.1) | 22.6 (50) |
| 230 | 29.1 (11.5) | 29.7 (11.7) | 0.2942 (10.4) | 22.7 (50) |
| 240 | 29.7 (11.7) | 30.3 (11.9) | 0.302 (10.7) | 23.4 (52) |
| 250 | 30.3 (11.9) | 30.9 (12.2) | 0.310 (10.9) | 23.0 (51) |
| 260 | 30.9 (12.2) | 31.5 (12.4) | 0.3176 (11.2) | 23.8 (52) |
| 270 | 31.5 (12.4) | 32.1 (12.6) | 0.3254 (11.5) | 24.1 (53) |
| 280 | 32.1 (12.6) | 32.7 (12.9) | 0.3332 (11.8) | 24.8 (55) |
| 290 | 32.7 (12.9) | 33.3 (13.1) | 0.341 (12.0) | 25.0 (55) |
| 291 | 33.3 (13.1) | 33.3 (13.1) | — | 24.3 (53) |
| 300 | 33.3 (13.1) | 33.9 (13.3) | 0.349 (12.3) | 25.3 (56) |
TABLE B — Channel with PolyWall I and Interceptor Frame and Grate
| Overall Channel Depth | Hyd. Flow | |||
|---|---|---|---|---|
| cm (in) | Constant (K) | Weight | ||
| Part # | Minimum | Maximum | cms (cfs) | kg (lbs) |
| 010 | 33.9 (13.3) | 34.5 (13.6) | 0.364 (12.9) | 37.3 (83) |
| 020 | 34.5 (13.6) | 35.1 (13.8) | 0.3719 (13.1) | 38.5 (85) |
| 021 | 35.1 (13.8) | 35.1 (13.8) | — | 38.1 (84) |
| 030 | 35.1 (13.8) | 35.7 (14.1) | 0.380 (13.4) | 38.8 (85) |
| 040 | 35.7 (14.1) | 36.3 (14.3) | 0.3876 (13.7) | 39.1 (86) |
| 050 | 36.3 (14.3) | 36.9 (14.5) | 0.3954 (14.0) | 38.9 (86) |
| 060 | 36.9 (14.5) | 37.5 (14.8) | 0.4032 (14.2) | 39.5 (87) |
| 070 | 37.5 (14.8) | 38.1 (15.0) | 0.4111 (14.5) | 40.0 (88) |
| 080 | 38.1 (15.0) | 38.7 (15.2) | 0.4189 (14.8) | 40.4 (89) |
| 090 | 38.7 (15.2) | 39.3 (15.5) | 0.4267 (15.1) | 40.8 (90) |
| 091 | 39.3 (15.5) | 39.3 (15.5) | — | 40.5 (89) |
| 096 | 39.3 (15.5) | 39.3 (15.5) | — | 33.3 (73) |
| 100 | 39.3 (15.5) | 39.9 (15.7) | 0.4346 (15.3) | 40.6 (89) |
| 110 | 39.9 (15.7) | 40.5 (15.9) | 0.4424 (15.6) | 41.6 (92) |
| 120 | 40.5 (15.9) | 41.1 (16.2) | 0.4502 (15.9) | 42.0 (92) |
| 130 | 41.1 (16.2) | 41.7 (16.4) | 0.4581 (16.2) | 42.8 (94) |
| 140 | 41.7 (16.4) | 42.3 (16.7) | 0.4659 (16.5) | 43.0 (95) |
| 150 | 42.3 (16.7) | 42.9 (16.9) | 0.4738 (16.7) | 42.9 (94) |
| 160 | 42.9 (16.9) | 43.5 (17.1) | 0.4816 (17.0) | 43.6 (96) |
| 170 | 43.5 (17.1) | 44.1 (17.4) | 0.4895 (17.3) | 44.0 (97) |
| 180 | 44.1 (17.4) | 44.7 (17.6) | 0.4973 (17.6) | 44.5 (98) |
| 190 | 44.7 (17.6) | 45.3 (17.8) | 0.5051 (17.8) | 44.8 (99) |
| 191 | 45.3 (17.8) | 45.3 (17.8) | — | 44.7 (98) |
| 200 | 45.3 (17.8) | 45.9 (18.1) | 0.513 (18.1) | 44.9 (99) |
| 210 | 45.9 (18.1) | 46.5 (18.3) | 0.5208 (18.4) | 45.6 (100) |
| 220 | 46.5 (18.3) | 47.1 (18.5) | 0.5287 (18.7) | 46.2 (102) |
| 230 | 47.1 (18.5) | 47.7 (18.8) | 0.5365 (18.9) | 46.3 (102) |
| 240 | 47.7 (18.8) | 48.3 (19.0) | 0.5444 (19.2) | 47.0 (103) |
| 250 | 48.3 (19.0) | 48.9 (19.3) | 0.5522 (19.5) | 46.5 (102) |
| 260 | 48.9 (19.3) | 49.5 (19.5) | 0.560 (19.8) | 47.4 (104) |
| 270 | 49.5 (19.5) | 50.1 (19.7) | 0.5679 (20.1) | 47.6 (105) |
| 280 | 50.1 (19.7) | 50.7 (20.0) | 0.5758 (20.3) | 48.3 (106) |
| 290 | 50.7 (20.0) | 51.3 (20.2) | 0.5836 (20.6) | 48.5 (107) |
| 291 | 51.3 (20.2) | 51.3 (20.2) | — | 47.8 (105) |
| 300 | 51.3 (20.2) | 51.9 (20.4) | 0.591 (20.9) | 48.8 (107) |
TABLE C — Channel with PolyWall II and Interceptor Frame and Grate
| Overall Channel Depth | Hyd. Flow | |||
|---|---|---|---|---|
| cm (in) | Constant (K) | Weight | ||
| Part # | Minimum | Maximum | cms (cfs) | kg (lbs) |
| 010 | 51.9 (20.4) | 52.5 (27.0) | 0.607 (21.4)) | 52.3 (115) |
| 020 | 52.5 (20.7) | 53.1 (20.9) | 0.615 (21.7) | 53.0 (117) |
| 021 | 53.1 (20.9) | 53.1 (20.9) | — | 52.7 (116) |
| 030 | 53.1 (20.9) | 53.7 (21.1) | 0.623 (22.0) | 53.4 (118) |
| 040 | 53.7 (21.1) | 54.3 (21.4) | 0.631 (22.3) | 53.7 (118) |
| 050 | 54.3 (21.4) | 54.9 (21.6) | 0.638 (22.5) | 53.5 (118) |
| 060 | 54.9 (21.6) | 55.5 (21.9) | 0.646 (22.8) | 54.1 (119) |
| 070 | 55.5 (21.9) | 56.1 (22.1) | 0.654 (23.1) | 54.6 (120) |
| 080 | 56.1 (22.1) | 56.7 (22.3) | 0.662 (23.4) | 55.0 (121) |
| 090 | 56.7 (22.3) | 57.3 (22.6) | 0.670 (23.7) | 55.4 (122) |
| 091 | 57.3 (22.6) | 57.3 (22.6) | — | 55.1 (121) |
| 096 | 57.3 (22.6) | 57.3 (22.6) | — | 47.9 (105) |
| 100 | 57.3 (22.6) | 57.9 (22.8) | 0.678 (23.9) | 55.2 (122) |
| 110 | 57.9 (22.8) | 58.5 (23.0) | 0.686 (24.2) | 56.2 (124) |
| 120 | 58.5 (23.0) | 59.1 (23.3) | 0.693 (24.5) | 56.6 (125) |
| 130 | 59.1 (23.3) | 59.7 (23.5) | 0.701 (24.8) | 57.4 (126) |
| 140 | 59.7 (23.5) | 60.3 (23.7) | 0.709 (25.0) | 57.6 (127) |
| 150 | 60.3 (23.7) | 60.9 (24.0) | 0.717 (25.3) | 57.5 (127) |
| 160 | 60.9 (24.0) | 61.5 (24.2) | 0.725 (25.6) | 58.2 (128) |
| 170 | 61.5 (24.2) | 62.1 (24.4) | 0.733 (25.9) | 58.6 (129) |
| 180 | 62.1 (24.4) | 62.7 (24.7) | 0.741 (26.2) | 59.1 (130) |
| 190 | 62.7 (24.7) | 63.3 (24.9) | 0.749 (26.4) | 59.4 (131) |
| 191 | 62.7 (24.7) | 63.3 (24.9) | 0.749 (26.4) | 59.4 (131) |
| 200 | 63.3 (24.9) | 63.9 (25.2) | 0.756 (26.7) | 59.5 (131) |
| 210 | 63.9 (25.2) | 64.5 (25.4) | 0.764 (27.0) | 60.2 (133) |
| 220 | 64.5 (25.4) | 65.1 (25.6) | 0.772 (27.3) | 60.8 (134) |
| 230 | 65.1 (25.6) | 65.7 (25.9) | 0.780 (27.5) | 60.9 (134) |
| 240 | 65.7 (25.9) | 66.3 (26.1) | 0.788 (27.8) | 61.5 (135) |
| 250 | 66.3 (26.1) | 66.9 (26.3) | 0.796 (28.1) | 61.1 (134) |
| 260 | 66.9 (26.3) | 67.5 (26.6) | 0.804 (28.4) | 62.0 (136) |
| 270 | 67.5 (26.6) | 68.1 (26.8) | 0.811 (28.7) | 62.2 (137) |
| 280 | 68.1 (26.8) | 68.7 (27.0) | 0.819 (28.9) | 62.9 (138) |
| 290 | 68.7 (27.0) | 69.3 (27.3) | 0.827 (29.2) | 63.1 (139) |
| 291 | 69.3 (27.3) | 69.3 (27.3) | — | 62.4 (137) |
| 300 | 69.3 (27.3) | 69.9 (27.5) | 0.835 (29.5) | 63.4 (140) |
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