manual for estimation of probable maximum precipitation - WMO

Figure
CONTENTS IX
3.1 Simplified inflow and outflow wind profiles over a mountain
barrier "... 56
3.2
3.3
Single layer, laminar flow, wind model G "
Multiple layer, laminar flow, wind model .
3.4 Blue Canyon orographic lamInar flow model test area in
C·aliEornia IO.............................. 61
3.5 Precipitation station elevations relative to adopted ground
profile for test area of Figure 3 .. 4 ••••••••••••••••.•••••• 62
3.6 Air streamlines and precipitation trajectories for test
case.............................................................. 63
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3 .14
3.15
3 .16
Maximum I-h wind profile and supporting data ..
Variation of maximum 6-h wind speed with time ..
Decrease of maximum precipitable water with duration .
Seasonal envelope of maximum observed dew points at Los
Angeles, California.. 0 •• 0." •• 0 0 0 .
Page
Maximum persisting 12-h 1000-hPa dew points (OC) for
February o o o 075
Maximum p/M ratios for comhination with orographic
storms 0 0 0 • " " " 0 • 0 0 •••••• " • • 76
Ratios of 6- and 72-h precipitation to 24-h
precipitation••• o " "..................... 77
Effective elevation and barrier heights (1 000 ft) in
northern California................................................... 79
Six-h 518 km 2 convergence PMP (in.) for January and
February "................................. 80
3.17 Variation of convergence PMP index with basin size and
duration for December 0 0 " .. 82
3.18 Typical orographic rainfall pattern for south-westerly
winds 0." 84
3.19
3.20
Basin subdivisions for check of topographic effects on
basinwide precipitation volume 0 0 0 " .. 0" " ..
2
March 2 4-h 25 900-km PMP (cm) ••••••••••••••••••••••••••••
57
59
69
70
72
73
74
85
86