Flood Hydrology
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FLOOD HYDROLOGY ASSESSMENT This summary outlines the works related to the Probable Maximum Flood for the design of dam. 1.
Preliminarily Works include: (a) Scanning of topographical maps for hydrological modelling using a hydrological model, such as RORB and HEC-HMS. (b) Meteorological data (temperature, rainfall, wind, and Relative Humidity) at the dam site, which is the nearest weather station to the dam site. (c) Hydrological modelling with relatively large Sub-catchments. (d) Depth-area-duration (DAD) relationship based on information available. (e) Accept derived routing parameters from the hydrological model without verification (f) Two isohyethal patterns (circular and elliptical) were each placed on a arbitrary location in the catchment for the purposes of deriving area distribution of probable maximum precipitation. (g) Preliminary storm maximization and transposition (mainly on moisture adjustment) (h) Historical temporal patterns for temporal development to be tested (i) Preliminary parametric study on the hydrological model (Primary on initial loss and continuing loss) (j) Develop one set of reservoir water level vs discharge (controlled opening of gate) for model study purposes. (k) Different cases such as four, five, six spillway gates, were tested on the hydrological model with above parameters
2.
Detailed modelling works include spillway and diversion floods: (a) Refinement of sub-catchments (b) Acquire additional meteorological data (extreme dew point temperature, 12 hrs persisting dew point temperature, etc) (c) Refinement of DAD relationship (d) Storm maximization and transposition with additional considerations (wind, elevation, etc) (e) Derivation of reliable moisture maximization with additional data on extreme dew point temperature and 12 hrs persisting dew point temperature. (f) Additional isohyethal patterns on different locations in the catchment (g) Additional temporal patterns for hydrological model. (h) Detail parametric studies for sensibility effects, such as initial loss, continuing, loss, and the routing parameter. (l) Develop additional sets of reservoir water level vs discharge (controlled opening of gate) for use in actual operation. (m) Spillway gate number and size optimisation (variation in the number and length of spillway gates) (n) Agreed and Adopt design parameters for final analysis (i) Determine the number of gate required and maximum water level in the reservoir (j) Diversion flood study using the hydrological model for floods up 500 and 1000 years of return period.
Preliminarily Works include: (a) Scanning of topographical maps for hydrological modelling using a hydrological model, such as RORB and HEC-HMS. (b) Meteorological data (temperature, rainfall, wind, and Relative Humidity) at the dam site, which is the nearest weather station to the dam site. (c) Hydrological modelling with relatively large Sub-catchments. (d) Depth-area-duration (DAD) relationship based on information available. (e) Accept derived routing parameters from the hydrological model without verification (f) Two isohyethal patterns (circular and elliptical) were each placed on a arbitrary location in the catchment for the purposes of deriving area distribution of probable maximum precipitation. (g) Preliminary storm maximization and transposition (mainly on moisture adjustment) (h) Historical temporal patterns for temporal development to be tested (i) Preliminary parametric study on the hydrological model (Primary on initial loss and continuing loss) (j) Develop one set of reservoir water level vs discharge (controlled opening of gate) for model study purposes. (k) Different cases such as four, five, six spillway gates, were tested on the hydrological model with above parameters
2.
Detailed modelling works include spillway and diversion floods: (a) Refinement of sub-catchments (b) Acquire additional meteorological data (extreme dew point temperature, 12 hrs persisting dew point temperature, etc) (c) Refinement of DAD relationship (d) Storm maximization and transposition with additional considerations (wind, elevation, etc) (e) Derivation of reliable moisture maximization with additional data on extreme dew point temperature and 12 hrs persisting dew point temperature. (f) Additional isohyethal patterns on different locations in the catchment (g) Additional temporal patterns for hydrological model. (h) Detail parametric studies for sensibility effects, such as initial loss, continuing, loss, and the routing parameter. (l) Develop additional sets of reservoir water level vs discharge (controlled opening of gate) for use in actual operation. (m) Spillway gate number and size optimisation (variation in the number and length of spillway gates) (n) Agreed and Adopt design parameters for final analysis (i) Determine the number of gate required and maximum water level in the reservoir (j) Diversion flood study using the hydrological model for floods up 500 and 1000 years of return period.
