Drainage Design Manual, Hydrology - Flood Control District of ...

Drainage Design Manual for Maricopa County
Hydrology: Application
f. Transform the S-graph into a 10-minute Unit Hydrograph
Time Q 1 Q 2 Q ult
hours cfs cfs cfs
(1) (2) (3) (4)
0.000 0.0 0.0 0
0.167 281.2 0.0 281
0.333 823.2 281.2 542
0.500 2,106.4 823.2 1,283
0.667 3,977.3 2,106.4 1,871
0.833 6,286.7 3,977.3 2,309
1.000 9,417.5 6,286.7 3,131
1.167 11,415.4 9,417.5 1,998
1.333 13,031.9 11,415.4 1,617
1.500 14,432.4 13,031.9 1,401
1.667 15,625.9 14,432.4 1,194
1.833 16,608.6 15,625.9 983
2.000 17,379.5 16,608.6 771
2.167 18,045.1 17,379.5 666
2.333 18,616.3 18,045.1 571
2.500 19,051.8 18,616.3 436
2.667 19,406.2 19,051.8 354
2.833 19,712.9 19,406.2 307
3.000 19,954.8 19,712.9 242
3.167 20,170.6 19,954.8 216
3.333 20,325.7 20,170.6 155
3.500 20,463.4 20,325.7 138
3.667 20,601.1 20,463.4 138
3.833 20,679.8 20,601.1 79
4.000 20,733.7 20,679.8 54
4.167 20,787.7 20,733.7 54
4.333 20,841.3 20,787.7 54
4.500 20,895.3 20,841.3 54
4.667 20,949.2 20,895.3 54
4.833 21,002.8 20,949.2 54
5.000 21,056.8 21,002.8 54
5.167 21,064.0 21,056.8 7
5.333 21,064.0 21,064.0 0
Notes:
(2) = Linear interpolation from previous
Table, column 2
(4) = (2) - (3)
(3) = (2) lagged 10-minutes
August 15, 2013 9-51