Flood Event
Hydrograph Shape
m3/s
101000
hr
0.2524
hr
172
n
0.55
n
0.55
min
160
Chapter 4 routing depends heavily on the inflow hydrograph. This version now lets you define a more realistic peaky rise and broader recession using power-shaped limbs.
Spillway and Dam
mAOD
240255
mAOD
240255
mAOD
240260
m
1100
C
0.52.5
m3/s
01000
Overtopped Crest
m
1300
C
0.52.5
If routed level exceeds dam crest, this adds a separate broad-crested overflow term so exceedance behaviour is more realistic than a hard cutoff.
Storage Curve
Storage Source
Enter one row per line as `level,area` or `level,area,storage`. If storage is omitted it is derived by trapezoidal integration of area with level.
Peak Level
249.584
mAOD
Peak Outflow
141.7
m3/s
Freeboard Remaining
0.716
m
Reservoir Profile
Routing Summary
Peak Reservoir Level249.584 mAOD
Peak Outflow141.7 m3/s
Key Checks
Peak head over spillway crest is 1.934 m, with 0.716 m freeboard remaining to dam crest.
Performance Metrics
Peak Level Time3.25 hr
Peak Outflow Time3.25 hr
Lag from Inflow Peak1.45 hr
Attenuation Ratio0.754
Peak Storage538.6 103 m3
Peak Storage Time3.25 hr
Peak Overtopping Flow0.00 m3/s
Overtopping StartsNone
Method Notes
Routing uses a power-shaped inflow hydrograph with configurable rising and recession limb exponents.
Storage values were derived from tabulated level-area data using trapezoidal integration.