Unreliable Stormwater Outlet
Unreliable Stormwater Outlet
(OP)
I have a situation where the existing stormwater disappears into a fractured rock bed in the side of a mountain and disappears. Locals have stated that there may be a cave underneath. Either way it is impossible to determine what its capacity is other than the fact that it has been working up until now. We are installing stormsewer on an adjacent roadway and this will increase the stormwater flow. There are expensive options to transport this water to a nearby lake by stormsewer but are not feasible. Is the only solution to continue to use this outlet and provide stormwater ponds if it cannot handle the flow. A pumping station was briefly entertained but the owner did not want it. Anyone encounter anything similar to this situation. A few nearby houses could be affected if the water surcharges without a holding area.
Thanks
SJcivil
Thanks
SJcivil





RE: Unreliable Stormwater Outlet
good luck
RE: Unreliable Stormwater Outlet
You can't be sure that whatever it is will always take water in.
RE: Unreliable Stormwater Outlet
What is a "100-year flood"?
A 100-year flood is a flood that has a 1-percent chance of being equaled or exceeded in any given year. A base flood may also be referred to as a 100-year storm and the area inundated during the base flood is sometimes called the 100-year floodplain.
What does the "100-year flood" mean?
The term "100-year flood" is misleading. It is not the flood that will occur once every 100 years. Rather, it is the flood elevation that has a 1- percent chance of being equaled or exceeded each year. Thus, the 100-year flood could occur more than once in a relatively short period of time. The 100-year flood, which is the standard used by most Federal and state agencies, is used by the National Flood Insurance Program (NFIP) as the standard for floodplain management and to determine the need for flood insurance. A structure located within a special flood hazard area shown on an NFIP map has a 26 percent chance of suffering flood damage during the term of a 30-year mortgage.
RE: Unreliable Stormwater Outlet
RE: Unreliable Stormwater Outlet
If only we knew what kind of rock underlies this site.
If only we knew how erodeable that rock is.
If only we knew ..............
RE: Unreliable Stormwater Outlet
Thanks
SJCivil
RE: Unreliable Stormwater Outlet
http://www.epa.gov/ogwdw000/uic/class5/index.html
http://www
and what we do locally around here is similar to the closure description at the end of this article except that we grout a 36" dia. perforated HDPE pipe verically into the open throat and extended to the ground surface and slightly beyond (with a cap over the end to prevent accidents or clogging). Of course this probably doesn't apply to your particular situation with a fractured rock bed.
h
RE: Unreliable Stormwater Outlet
RE: Unreliable Stormwater Outlet
RE: Unreliable Stormwater Outlet
RE: Unreliable Stormwater Outlet