FLOOD06918

• County: Statewide
• Community: State of Colorado
• Basin: Statewide
• Title: The NWS Simplified Dam Break-Flood Forecasting Model
• Date: 5/16/1986
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

SIMPLIFIED DAMBREAK MODEL
FORTRAN LANGUAGE INTERACTIVE VERSION
WRITTEN BY JONATHAN N. WETMORE HRL MAY, 1983
INPUT "SHORT" FOR SHORT VERSION, "LONG" FOR FULL MODEL
SHORT
INPUT HEIGHT (FEET) OF DAM
100.00
INPUT VOLUME OF RESERVOIR (AC-FT) AT MAX POOL ELEV
25000.00
INPUT FINAL BREACH WIDTH (FT)
IF N/A ENTER O. DEFAULT USED = 3 * BREACH DEPTH
0.00
INPUT TIME (MINUTES) REQUIRED FOR BREACH FORMATION
IF N/A 6 ENTER O.
0.0
ENTER TYPE OF DAM...O FOR EARTH DAM, 1 FOR CONCRETE DAM
o
ESTIMATED TIME OF FAILURE - 33.33 MINUTES
INPUT NUMBER OF PAIRS OF ELEV-TOPWIDTHS USED TO
DESCRIBE EACH X-SECTION (MIN-fJ MAX=8)
MODEL ASSUMES DEPTH #1 - O. Al'IJJ TOPW #1 = O.
2
INPUT DEPTH (FEET) # 2 AND ASSOC. TOPWIDTH FOR X-S # 1
100.00
1000.00
INPUT MANNING N AT X-S # 1 (DEFAULT = 0.050)
0.000
INPUT CHANNEL SLOPE (FT/MI) BELOW DAM
0.00
ENTER NUMBER OF FORECAST POINTS BELOW DAM (MAX - 7)

7
INPUT DIST DOWNSTREAM (MILES) TO FORECAST PT. NO. 1
10.00
INPUT DIST DOWNSTREAM (MILES) TO FORECAST PT. NO. 2
20.00
INPUT DIST DOWNSTREAM (MILES) TO FORECAST PT. NO. 3
30.00
INPUT DIST DOWNSTREAM (MILES) TO FORECAST PT. NO. 4
40.00
INPUT DIST DOWNSTREAM (MILES) TO FORECAST PT. NO. 5
50.00
INPUT DIST DOWNSTREAM (MILES) TO FORECAST PT. NO. 6
60.00
INPUT DIST DOWNSTREAM (MILES) TO FORECAST PT. NO. 7
70.00
PROFILE OF CRESTS AND TIMES FOR DAM
ON RIVER
DISTANCE PEAK .PEAK FLOOD TIME TIME TIME
DOWNSTREAM FLOW DEPTH DEPTH FLOOD PEAK DEFLOOD
(MILES) CFS FEET FEET HR HR HR
0.00 324314.38 63.50 0.00 -999.00 0.56 -999.00
10.00 238917.97 56.02 0.00 -999.00 1.46 -999.00
20.00 206646 .09 53.06 0.00 -999.00 2.37 -999.00
30.00 183701.38 50.77 0.00 -999.00 3.32 -999.00
40.00 167489.13 49.04 0.00 -999.00 4.32 -999.00
50.00 152864.66 47.39 0.00 -999.00 5.34 -999.00
60.00 141868.66 46.08 0.00 -999.00 6.38 -999.00
70.00 131442.41 44.78 0.00 -999.00 7.42 -999.00
II-14