Rapic Flood Assessment

Dam Category and Flood Assessment

Dam Category:
A
B
C
D

Flood Assessment:
Safety Flood Check
Design Flood

Duration of Flood:

Safety Check

Design Flood

Dam Geometry

Dam Type:
Rockfill
Earthfill
Concrete
Masonry

Top of Dam Level:

Nominal

Measured Low Point

Measured Typical Point

Value for Calculation

Average

Core Level:

Nominal

Measured

Value for Calculation

Average

Slopes:
U/S Slope 1V H D/S Slope 1V H

Wave Wall Top Level:

Nominal

Measured (max)

Details of Gaps etc.

Base of Wall Level

Value for Calculation

Average

U/S & D/S Protection

Dam Crest protection:
Grass
Tarmacadam
Other

Downstream Dam Protection:
Grass
Reinforced grass
Other

Protection Level Provided:
Allowable Mean Overtopping Discharge q (l/s/m):

Upstream Dam Protection:
Concrete, asphalt, closed concrete block, grass One-quarter of stone setting 10cm higher
Fitted basalt blacks Small blocks over 1/25 of surface Rock armour in one layer on a low permeability base
Open stone asphalt Small blocks over 1/9 of surface Rock armour in two layer on a low permeability base
Open Concrete revetment block

Coefficient, Yf:

Spillway Structure

Spillway Crest/Invert Level:

Nominal

Measured

Value for Calculation

Average

Spillway Pipe Dia/Crest Length:

Nominal

Measured

Value for Calculation

Average

Catchment Data

Catchment Area Km2

Reservoir Area m2

Mainstream Lenght m

H10 m

H85 m

SAAR mm

Nature of Catchment:
Mountainous
Hilly
Undulating
Flat
Catchment Coeff.k=

Wave Surcharge

Fetch. F m

U50 m/s

Angle of the North *N

Return period: Year

Sloping face with small vertical Wave Wall
Sloping face (no Wave Wall)
Vertical and steep Wave Wall
Angle of the Wave Wall *N

* Enter value for "Top of Dam Level".

Stillwater Rise

Stillwater Flood Rise:

SFCDF

Head on Spillway m

SFC DF

Tp m

S m

SFCDF

R m

SFCDF

H _SFR m

H _SFL m

Dam Category and Flood Assessment

Dam Geometry

U/S & D/S Protection

Spillway Structure

Catchment Data

Wave Surcharge

Catchment

Catchment - Rainfall Data:

Stillwater Rise

Stillwater Flood Rise:

Wave Surcharge 1

Wave Height:

Wave Surcharge 2

Safety Check Flood Condition

Design Flood Condition

Conclusion

Check provision of adequate dam freeboard:

Safety Check Flood Condition

Design Flood Condition

Check retention of flood surcharge below top of dam level and core:

Safety Check Flood Condition

Design Flood Condition