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nat_horsfield

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About nat_horsfield

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  1. Does anyone know of a way to model one-way tide gates on culverts that will only allow water to flow down them when conditions at the outlet allow?
  2. I have a very simple 2D only model that I am running with direct rainfall for 1, 2, 100 and 500 year ARI events of 1, 6, 36 and 72 hour durations, but I am only getting wet cells for the 500 year 6 hour and 72 hour events. I think that this may be something to do with there not being enough water to wet the cells, but realistically I should be getting wet cells for smaller events as well. I have reduced the cell wet/dry depth to the minimum of 0.0002 m and turned off Free Overfall, but that hasn't helped. Below are extracts from the .tlf files for the rainfall histograms for the 500 yr 36 hr (not producing wet cells) and 500 yr 72 hr (producing wet cells) events, because I don't seem able to attach the files. Trying to open file ..\bc_dbase\500yr_36hr.csv...OK. Opened File Unit: 926 Looking for data in columns 2, 3 after line starting with: Time_min,Time_hr,Rainfall_mm Extracting Data... ...Finished Extracting Data Checking ascending order of Column 1...OK Applying time shift of ...................: 0.000 Applying value addition factor of ........: 0.000 Applying value multiplication factor of ..: 1.000 Column 1 ranges from 0.000 to 44.000 Column 2 ranges from 0.000 to 45.190 ...Closed File Unit: 926 ...Closed File Unit: 925 Rainfall histogram conversion from mm to mm/h (Col 2), m/s (Col 3) and m3/s (Col 4) before any losses or factors is: 1 -1.000 0.0000 0.000000000 0.000000000 2 1.000 0.0000 0.000000000 0.000000000 3 3.000 12.4550 0.000003460 0.000086493 4 5.000 8.9800 0.000002494 0.000062361 5 7.000 22.5950 0.000006276 0.000156910 6 9.000 6.7600 0.000001878 0.000046944 7 11.000 5.8900 0.000001636 0.000040903 8 13.000 5.6000 0.000001556 0.000038889 9 15.000 4.4400 0.000001233 0.000030833 10 17.000 5.1150 0.000001421 0.000035521 11 19.000 2.5100 0.000000697 0.000017431 12 21.000 1.6400 0.000000456 0.000011389 13 23.000 2.8000 0.000000778 0.000019444 14 25.000 3.2850 0.000000913 0.000022812 15 27.000 4.2500 0.000001181 0.000029514 16 29.000 3.6700 0.000001019 0.000025486 17 31.000 1.7400 0.000000483 0.000012083 18 33.000 1.2550 0.000000349 0.000008715 19 35.000 2.2200 0.000000617 0.000015417 20 37.000 1.3500 0.000000375 0.000009375 21 39.000 0.0000 0.000000000 0.000000000 22 41.000 0.0000 0.000000000 0.000000000 23 43.000 0.0000 0.000000000 0.000000000 24 45.000 0.0000 0.000000000 0.000000000 Trying to open file ..\bc_dbase\500yr_72hr_001.csv...OK. Opened File Unit: 926 Looking for data in columns 2, 3 after line starting with: Time_min,Time_hr,Rainfall_mm Extracting Data... ...Finished Extracting Data Checking ascending order of Column 1...OK Applying time shift of ...................: 0.000 Applying value addition factor of ........: 0.000 Applying value multiplication factor of ..: 1.000 Column 1 ranges from 0.000 to 84.000 Column 2 ranges from 0.000 to 65.040 ...Closed File Unit: 926 ...Closed File Unit: 925 Rainfall histogram conversion from mm to mm/h (Col 2), m/s (Col 3) and m3/s (Col 4) before any losses or factors is: 1 -1.000 0.0000 0.000000000 0.000000000 2 1.000 0.0000 0.000000000 0.000000000 3 3.000 0.0000 0.000000000 0.000000000 4 5.000 16.2600 0.000004517 0.000112917 5 7.000 16.2600 0.000004517 0.000112917 6 9.000 8.6725 0.000002409 0.000060226 7 11.000 8.6725 0.000002409 0.000060226 8 13.000 5.7200 0.000001589 0.000039722 9 15.000 5.7200 0.000001589 0.000039722 10 17.000 4.5175 0.000001255 0.000031372 11 19.000 4.5175 0.000001255 0.000031372 12 21.000 3.5525 0.000000987 0.000024670 13 23.000 3.5525 0.000000987 0.000024670 14 25.000 4.2750 0.000001188 0.000029688 15 27.000 4.2750 0.000001188 0.000029688 16 29.000 2.1075 0.000000585 0.000014635 17 31.000 2.1075 0.000000585 0.000014635 18 33.000 3.0100 0.000000836 0.000020903 19 35.000 3.0100 0.000000836 0.000020903 20 37.000 1.2650 0.000000351 0.000008785 21 39.000 1.2650 0.000000351 0.000008785 22 41.000 1.5050 0.000000418 0.000010451 23 43.000 1.5050 0.000000418 0.000010451 24 45.000 1.7475 0.000000485 0.000012135 25 47.000 1.7475 0.000000485 0.000012135 26 49.000 0.5425 0.000000151 0.000003767 27 51.000 0.5425 0.000000151 0.000003767 28 53.000 0.8425 0.000000234 0.000005851 29 55.000 0.8425 0.000000234 0.000005851 30 57.000 0.7225 0.000000201 0.000005017 31 59.000 0.7225 0.000000201 0.000005017 32 61.000 0.8425 0.000000234 0.000005851 33 63.000 0.8425 0.000000234 0.000005851 34 65.000 2.5300 0.000000703 0.000017569 35 67.000 2.5300 0.000000703 0.000017569 36 69.000 1.1450 0.000000318 0.000007951 37 71.000 1.1450 0.000000318 0.000007951 38 73.000 0.9625 0.000000267 0.000006684 39 75.000 0.9625 0.000000267 0.000006684 40 77.000 0.0000 0.000000000 0.000000000 41 79.000 0.0000 0.000000000 0.000000000 42 83.000 0.0000 0.000000000 0.000000000 43 85.000 0.0000 0.000000000 0.000000000
  3. We are looking at using TUFLOW for the first time in our office. Would it be possible to use MapInfo 7 with the current TUFLOW release, or would there be compatibility issues that would require a newer version?
  4. I have set up a model that includes sections of 1d open channel connected by a circular culvert. The model is becoming unstable because no water is flowing through the culvert, causing it to back up and overload the channel. I have made the following checks and have been unable to find any reason for this: The dimensions and charactreistics of the channel and culvert are being reported correctly in the eof, 1d_nwk_check and 1d_inverts_check files. The ends of the channel and the culvert are snapped to each other. The elevation of the soffit of the culvert is located above the bed of the adjacent channel cross-sections. The culvert losses used are the defaults suggested in the manual. Has anyone encountered this problem before?
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