Qustion e xplhine /answer he Foll winy tms/qustiens I what has Califotina bone aft oroville Dnm (2) 1^ plain Ena lish, describe Jfft/en ,ees of (3) h orde to study hyd ranrnph, we have hydro raph meths Please comeare them Crisis? w, hat hnve }ened ? SCs rai istribution and the tic Solution 1) Orovally Dam crisis : Dam main and emergency spillway were significantly damaged.Excavation of featger river basin causes less damage to the area down stream breach. Due to unrecognized inherent vulnerability of the design and as constructed conditoins and the chute slab detoration, the spillway chute slab failure, although inevitable, was unexpected. 2)Type I 24-hr Tabular Type IA 24-hr Tabular Type II 6-hr Tabular Type II 12-hr Tabular Type II 24-hr Tabular Type II 48-hr Tabular Type III 24-hr Tabular 3) Unit Hydrograph A unit hydrograph is a hydrograph for a given basin that is produced by a unit of rainfall (excess) depth. Since there are several possible durations for that unit of rainfall depth, a given basin can have several unit hydrographs. A unit hydrograph embodies the diffusion properties of a basin, that is, the unit hydrograph is the means by which basin diffusion can be calculated. Steeper basins have less diffusion; milder basins have more diffusion. The main parameter of the unit hydrograph is the basin lag; the longer the lag, the more the diffusion. The peak flow of the unit hydrograph is inversely related to the basin lag; the longer the lag, the lesser the peak flow. Unit hydrographs can be derived from rainfall-runoff data. However, the procedure is time- consuming and it is limited to gaged basins, which are comparatively small in number. Snyder\'s synthetic unit hydrograph A synthetic unit hydrograph retains all the features of the unit hydrograph, but does not require rainfall-runoff data. The first synthetic unit hydrograph was developed by Snyder in 1938. In order to provide sufficient flexibility for simulating a wide range of diffusion amounts, Snyder devised two parameters: (1) a time parameter Ct, and (2) a peak parameter Cp. A larger Ct meant a greater basin lag and, consequently, greater diffusion. A larger Cp meant a greater peak flow and, consequently, less diffusion..

1. Qustion e xplhine /answer he Foll winy tms/qustiens I what has Califotina bone aft oroville Dnm
(2) 1^ plain Ena lish, describe Jfft/en ,ees of (3) h orde to study hyd ranrnph, we have hydro
raph meths Please comeare them Crisis? w, hat hnve }ened ? SCs rai istribution and the tic
Solution
1) Orovally Dam crisis : Dam main and emergency spillway were significantly
damaged.Excavation of featger river basin causes less damage to the area down stream breach.
Due to unrecognized inherent vulnerability of the design and as constructed conditoins and the
chute slab detoration, the spillway chute slab failure, although inevitable, was unexpected.
2)Type I 24-hr Tabular
Type IA 24-hr Tabular
Type II 6-hr Tabular
Type II 12-hr Tabular
Type II 24-hr Tabular
Type II 48-hr Tabular
Type III 24-hr Tabular
3)
Unit Hydrograph
A unit hydrograph is a hydrograph for a given basin that is produced by a unit of rainfall (excess)
depth. Since there are several possible durations for that unit of rainfall depth, a given basin can
have several unit hydrographs. A unit hydrograph embodies the diffusion properties of a basin,
that is, the unit hydrograph is the means by which basin diffusion can be calculated. Steeper
basins have less diffusion; milder basins have more diffusion. The main parameter of the unit
hydrograph is the basin lag; the longer the lag, the more the diffusion. The peak flow of the unit
hydrograph is inversely related to the basin lag; the longer the lag, the lesser the peak flow.
Unit hydrographs can be derived from rainfall-runoff data. However, the procedure is time-
consuming and it is limited to gaged basins, which are comparatively small in number.
Snyder's synthetic unit hydrograph
A synthetic unit hydrograph retains all the features of the unit hydrograph, but does not require
rainfall-runoff data. The first synthetic unit hydrograph was developed by Snyder in 1938. In
order to provide sufficient flexibility for simulating a wide range of diffusion amounts, Snyder
devised two parameters: (1) a time parameter Ct, and (2) a peak parameter Cp. A larger Ct meant
a greater basin lag and, consequently, greater diffusion. A larger Cp meant a greater peak flow
and, consequently, less diffusion.