Lecture 7

Question 1

what is routing

Answer 1

the prediction of translation and attenuation of inflow hydrographs through surface water impoundments and channels

Question 2

what are some applications of routing in engineering hydrology

Answer 2

designing/ sizing detention retention hydroelectric and municipal reservoirs

flow modelling in river systems

runoff routing

Question 3

hydrologic routing methods involve

Answer 3

application of the continuity equation in combination with a conceptual/ empirical model that describes the relationship between storage and outflow

Question 4

what is the level pool method

Answer 4

for routing of flows through a reservoir we typically assume that the water is level and that the outflow is controls by the water level and the hydraulic charectristics of the outflow structure

water level also represents storage

Question 5

why is the continuity equation rearranged for reservoir routing

Answer 5

it is written in finite difference form and rearranged so that all unkowns at any time step are on the right hand side

Question 6

what relationship is needed to solve routing pond problems

Answer 6

the relationship between O and 2s/dt + O

Question 7

to apply the level pool method we need to

Answer 7

develop mathematical relationships relating depth to storage to outflow

Question 8

the depth to storage relationship is defined by

Answer 8

the geometry of the reservoir

Question 9

the storage outflow relationship is defined by

Answer 9

the size/type/shape of the reservoir outflow structure

Question 10

For regular shaped reservoirs depth-storage relationships are based on

Answer 10

geometric relationships

Question 11

for irregular shaped reservoirs depth-storage relationships are based on

Answer 11

the bathymetry of the impoundment

Question 12

the relationship between storage (depth) and outflow depends on the

Answer 12

outflow structure

Question 13

what kinds of outlets might be in a reservoir pond

Answer 13

orifice and wier

Question 14

orifice vs weir equations

Answer 14

if it has ko its an orifice, k2 is a weir.

Question 15

what assumptions are made for runoff routing

Answer 15

the catchment is viewed as a very shallow reservoir
inflow is equal to rainfall excess (P-F)
outflow is a linear or non-linear function of depth of flow on the catchment
this is an alternative to the unit hydrograph approach