Lesson 2 - Hydrologic Cycle Flashcards
From a civil engineering perspective, the most important subsytem is the _________
watershed system
the ______ is simply that area of land that contributes surface runoff to a single outlet and is separated from other watersheds by a drainage divide.
Watershed
___________ is used to define a watershed boundary
Topographic elevation
5 Watershed characteristics
Size slope shape soil type storage capacity
- was one of the earliest explored rivers in Texas
- Major water supply and recreational river for the hill country near San Marcos - drains to coast
Guadalupe River - Large Basin
- Sits across a canyon at Marshall Ford on the Colorado Rover west of Austin, Texas
- Built from 1937 to 1941
- Named in 1941 in honor of US Representative J.J. Mansfield
- Created a 50 mile long lake that is hundreds of feet deep in lower end
Mansfield Dam - medium scale
The accounting or allocation of water to each of the component of the hydrologic cycle
The water balance (Water budget)
NAMRIA
National Mapping and Resource information authority of DOD
PAGASA
Philippine Atmospheric, Geophysical and Astronomical Services Administration
EMB
Environmental Management Bureau of DENR
BSWM
Bureau of soil and water management of DA
BRS
Bureau of Research and Standards of DPWH
Rainfall that falls in a watershed will generate runoff to the ___________
watershed outlet
Problems in hydrology
- extreme weather and rainfall variation
- streamflow and major flood devastation
- river routing and hydraulic conditions
- overall water supply -local and global scales
- flow and hydraulics in pipes, streams and channels
- watershed management for urban development
Major causes of flooding
- highly developed area
- intensity and duration of rainfall
- flat topography with little storage
- poor building practices in floodprone areas
- no replacement pf lost storage as area grows
