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 .1
2.0 * .2 .2 .2 .3 .3 .4 .4 .4 .5 .5
3.0 * .5 .7 .8 1.7 2.2 3.5 4.3 12.2 16.8 25.6
4.0 * 30.0 10.2 3.1 3.0 2.9 2.8 2.8 2.7 2.7 2.6
5.0 * 2.6 2.5 2.4 2.4 2.3 2.2 2.2 2.1 2.1 2.0
6.0 * 1.9 1.2 1.0 .9 .9 .9 .9 .9 .9 .9
7.0 * .9 .9 .9 .9 .9 .9 .9 .8 .8 .8
8.0 * .8
INITIAL ABSTRACTION = 21.77 mm.
ROUTED FLOW TIME FROM THE SUBWATERSHED = .45 hours.
TIME TO PEAK OF UNIT HYDROGRAPH = .O5 hours.
THE DEPTH OF WATER ON WATERSHED = 2 54.89 mm.
VOLUME OF RUNOFF = 64.46 thousand cu.m.
PEAK RUNOFF RATE = 30.69 cu. m./sec.
TIME TO PEAK RUNOFF = 4.05 hours.
THERE IS NO SEDIMENT CONTAINED IN THE STORM RUNOFF FROM THIS WATERSHED