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Interpolation or extrapolation of rainfall data

Interpolation or extrapolation of rainfall data

Interpolation or extrapolation of rainfall data

I'm posting on behalf of my friend. Recently, he got an overseas job from the far east, he's asked to do a drainage design for a rural road. The road itself is roughly 40 miles long. However, there is no rainfall station along the proposed road. There is a station at on end of the road but the nearest station to the other end is about 20 miles away. The road itself is running on a mountainous terrain. The job is somewhere in Fiji. The weather is pretty hot. Is there anyway to make use of the limited data to interpolate or extrapolate data between the two stations?
He needs to form a rainfall intensity chart for hydrological analysis.
I was told  polynomial equations are used to solve this problem; is there any reference I can refer to?

Thanx in advance

RE: Interpolation or extrapolation of rainfall data

Generally!!! rainfall data collection stations are only as good as the the data collected???
This means that if a storm passed just inches away from the data collector the collector would not have registerd the rain event.  However the results of the rain event would be felt on streams and overland flow areas.

Try obtaining data from a local weather bureau or even look at a airport doppler system for rainfall totals.  Have him talk to everybody he can, especially local amature weather observers.

Keep this in mind, weather knows no boundarys so approach the problem in a conservative manner, and use general rainfall totals not specific.

RE: Interpolation or extrapolation of rainfall data

He also has to look at the prevailing winds out there. the rain falls on the windward side of the mountain. If his road is on the lee side it will receive much less rain. also look at where these weather stations are.  And get to the U.S. Atmospheric and Oceanographic site. I can't tell you where it is but its on the web. Military air bases also have good weather data.

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