1.0 in channel hydraulic stgructures Flashcards
three purposes of hydrulic structures (vague)
measure
regulate
discharge
2 parts to design
planning
detailed design
steps in planing
identify need
site selection
colection of existing data
preliminary deisgn
detailed desgin consists of
final site selection
estimate area required for structure and ancillary
works
additional data selection
steps in detailed deisgn
hydrologic design hydraulic design geotrechnical structural detail costing, specifications, other document
what is hydrologic design
runoff (hydrographs, flow rates, (model with rational, scs, HEC-HMS)
four issues that need to be considered with hydrologic design
land use change
climate change
catchments (design flows, peak, low, durations etc)
erosion (sediment transport)
three main parameters in hydraulic design
water level
energy losses
flow rates
this means hydraulic design requirements are
sufficient capacity to pass design discharge (overflow capacity)
kinetic energy dissipated (protect structure and downstream)
minimse hydraulic loss in certain transitions by correct structural proportioning
primary causes of channels and in channel hydraulic design failure
insufficient capacity
insufficient energy dissipation
basic components of a hydraulic structure
inlet
conduit
outlet
main issues in geotechical design
soil (remove top soil)
stable foundations (sliding, overturning, seepage)
scouring, errosion
structural design consists of
materials (stresses etc)
ease of construction (curves, complexity)
to prevent seepage what must structure have
suitable wing walls
side walls
head wall extensions
toe walls
what loads are considered in structural design
dead load weights (water concrete backfill)
operating deck loads
lateral pressure (water earth, construction equpiment)
other pressures (uplift (water percolating ) siesmic)
