1989-10-10_REVISION - M1988112 ‎(7)‎

• Permit No: M1988112
• IBM Index Class Name: Revision
• Doc Date: 10/10/1989
• Doc Name: APPENDIX H DIVERSION DITCH DESIGN CALCULATIONS
• Type & Sequence: AM1
• Media Type: D
• Archive: No

********** STORM HYDROGRAPH GENERATED FROM START OF RAINFALL ***********
TIME * 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
****************************************************************************
.0 * .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
1.0 * .0 .0 .0 .0 .0 .0 .0 .1 .1 .2
•
2.0 * .2 .3 .3 ,4 .4 ,5 .5 .6 .6 .7
3.0 * .7 .9 1.1 1.7 2.9 4.0 5.7 11.0 21.7 29.5
4.0 * 40.5 30.8 7.1 4.4 4.2 4.1 4.0 3.9 3.8 3.8
5.0 * 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.9
6.0 * 2.7 2.3 1.5 1.4 1.3 1.3 1.3 1.3 1.3 1.3
7.0 * 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 1.2 1.2
8.0 * 1.2 .8
INITIAL ABSTRACTION = 21.77 mm.
ROUTED FLOW TIME FROM THE SUBWATERS HED = .70 hours.
TIME TO PEAK OF UNIT HYDROGRAPH = .OS hours.
THE DEPTH OF WATER ON WATE RSHED = 252.12 mm.
VOLUME OF RUNOFF = 91.18 tfiousand cu.m.
PEAK~RUNOFF RATE = 42.42 cia. m./sec.
TIME TO PEAK RUNOFF = 4.05 hours.
THERE IS NO SEDIMENT CONTAINED IN THE STORM RUNOFF FROM 'CHIS WATERSHED
r 1
L_J