section.md

MASS1 Cross Section File

Cross section data records consist of multiple lines. The information required will vary depending on cross section type. In all cross records, the first field of the first line is an integer cross section identifier and the second field is the cross section type.

Prismatic Cross Sections

Rectangular

A rectangular cross section is specified by two lines. The first line contains the section identifier and type (1). The second line contains the section width and must be terminated with a /. Here is an example rectangular cross section:

3 1
3000.0 /

Rectangular w/ Flood Plain

This is a compound section combining a rectangular main section with a flood plain.

In the example below, the base rectangular section is 3000.0 units wide and 10.0 units deep. The flood plain is 6000 units wide.

3 2
10.0 3000.0 6000.0 /

General Cross Section

General cross sections have a type of 50. The first line contains the section identifier, the type (50), and the vertical step at which cross section properties (area, hydraulic radius, etc.) are pre-calculated.
A general cross section example from Lake Roosevelt is shown below. It was generated by the scripts/cross-section/CHARIMAview.pl script.

As it looks in the cross section file:

12250   50       1.0   RM=79.500, COLUMBIA River
    1  127
    1300.0    1382.6    1350.0    1371.8    1400.0    1362.2    1450.0    1349.1
    1500.0    1337.5    1550.0    1312.9    1600.0    1285.1    1650.0    1258.2
    1700.0    1232.8    1750.0    1212.4    1800.0    1186.9    1850.0    1172.7
    1900.0    1164.3    1950.0    1161.0    2000.0    1158.1    2050.0    1156.8
    2100.0    1156.7    2150.0    1155.0    2200.0    1152.4    2250.0    1150.8
    2300.0    1149.0    2350.0    1145.3    2400.0    1144.3    2450.0    1139.8
    2500.0    1137.6    2550.0    1136.8    2600.0    1136.4    2650.0    1136.4
    2700.0    1135.7    2750.0    1135.3    2800.0    1135.5    2850.0    1135.3
    2900.0    1135.4    2950.0    1135.0    3000.0    1132.7    3050.0    1134.0
    3100.0    1133.0    3150.0    1132.2    3200.0    1131.3    3250.0    1130.9
    3300.0    1127.7    3350.0    1123.8    3400.0    1113.6    3450.0    1104.5
    3500.0    1101.0    3550.0    1100.6    3600.0    1102.9    3650.0    1107.0
    3700.0    1112.7    3750.0    1123.1    3800.0    1134.4    3850.0    1144.5
    3900.0    1157.4    3950.0    1163.7    4000.0    1164.1    4050.0    1162.4
    4100.0    1154.5    4150.0    1148.5    4200.0    1138.3    4250.0    1126.7
    4300.0    1113.3    4350.0    1102.3    4400.0    1093.4    4450.0    1082.2
    4500.0    1070.9    4550.0    1066.1    4600.0    1066.5    4650.0    1066.7
    4700.0    1065.6    4750.0    1065.2    4800.0    1065.6    4850.0    1067.7
    4900.0    1072.5    4950.0    1086.1    5000.0    1087.7    5050.0    1084.5
    5100.0    1084.1    5150.0    1089.0    5200.0    1091.8    5250.0    1100.4
    5300.0    1114.1    5350.0    1113.6    5400.0    1106.1    5450.0    1104.1
    5500.0    1105.9    5550.0    1105.9    5600.0    1106.0    5650.0    1108.4
    5700.0    1110.5    5750.0    1116.3    5800.0    1122.9    5850.0    1136.5
    5900.0    1148.9    5950.0    1160.1    6000.0    1172.1    6050.0    1181.9
    6100.0    1190.2    6150.0    1194.7    6200.0    1194.8    6250.0    1191.3
    6300.0    1194.8    6350.0    1204.3    6400.0    1216.4    6450.0    1222.7
    6500.0    1232.5    6550.0    1244.7    6600.0    1257.6    6650.0    1274.0
    6700.0    1284.3    6750.0    1308.8    6800.0    1357.8    6850.0    1353.6
    6900.0    1380.7    6950.0    1391.4    7000.0    1405.1    7050.0    1415.5
    7100.0    1404.5    7150.0    1388.1    7200.0    1366.9    7250.0    1330.9
    7300.0    1286.5    7350.0    1311.0    7400.0    1346.2    7450.0    1364.2
    7500.0    1381.0    7550.0    1392.0    7600.0    1408.5 /

Note the RM=79.500, COLUMBIA River on the first line is not used by MASS1, but is documentation added and used by cross section handling scripts.