Which is a result of a poorly designed drainage system?
Cut or fill failures, road surface erosion, and weakened subgrades followed by a mass failure are all products of inadequate or poorly designed drainage. As has been stated previously, many drainage problems can be avoided in the location and design of the road: Drainage design is most appropriately included in alignment and gradient planning.
Where does the water go after it reaches the ground?
Of the water that reaches the ground in the form of rain, some will percolate into the soil to be stored until it is taken up by plants or transported through pores as subsurface flow, some will evaporate back into the atmosphere, and the rest will contribute to overland flow or runoff.
How is precipitation intensity related to drainage area?
In northwest Oregon, frequency analysis has revealed that discharge for the flow event having a 25-year recurrence interval is Most closely correlated with drainage area and precipitation intensity for the 2-year, 24-hour storm event.
What’s the best way to turn the water back on?
Allow the water to continue running until it runs freely and smoothly, which generally takes 5 to 10 minutes. Open all faucets and spigots another one-quarter to one-third of the way. Wait for the water to run smoothly and open the faucets fully. Allow the water to flow until water no longer spits from the faucet.
Where does the water go when it flows down a hill?
The water is moving downhill (“down-gradient”) toward a creek at the bottom of the hill. Normally, the water would just flow underground to the bottom of the hill and seep out of the stream banks into the creek.
Is the water below ground moving all the time?
Yes, water below your feet is moving all the time, but, no, if you have heard there are rivers flowing below ground, that is not true. Water moves underground downward and sideways, in great quantities, due to gravity and pressure. Eventually it emerges back to the land surface, into rivers, and into the oceans to keep the water cycle going.
How long does it take for groundwater overdraft to occur?
In general, the time lags inherent in the dynamic response of groundwater to development have been ignored by water management agencies, decades after scientific understanding of the issue was consolidated. In brief, the effects of groundwater overdraft (although undeniably real) may take decades or centuries to manifest themselves.
How does inadequate drainage affect the engineering properties?
The presence of excess water or moisture within the roadway will adversely affect the engineering properties of the materials with which it was constructed. Cut or fill failures, road surface erosion, and weakened subgrades followed by a mass failure are all products of inadequate or poorly designed drainage.