Some related info:
=====
DISTANCE ESTIMATION BY FORAGING HONEYBEES
HARALD E. ESCH AND JOHN E. BURNS
Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
http://jeb.biologists.org/content/199/1/155.full.pdf
....Bees
foraging uphill need less energy on the whole foraging trip than
bees foraging downhill. They climb unloaded against gravity
on the way to the feeder, but they can drop to the altitude of
the hive when loaded with sugar water. Bees foraging downhill
have to carry their nectar load back uphill......
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Long-distance pollen flow assessment through evaluation of
pollinator foraging range suggests transgene escape distances
Rémy S. Pasquet*,†,‡,§, Alexis Peltier¶, Matthew B. Hufford‡,
Emeline Oudin‖, Jonathan Saulnier‖, Lénaic Paul‖, Jette T. Knudsen**,
Hans R. Herren*,††,§, and Paul Gepts‡
http://www.pnas.org/content/105/36/13456.full.pdf
The longest flights (11 flights longer than 2.5 km) apparently took
place when bees were pushed by the wind, which means that the bee,
loaded with pollen or nectar, had to fly against the wind on its way back
to the nest. This seems to contradict Roubik's (1) assessment that a
symmetrical distribution of foragers around the home base is to be
expected in a relatively flat area, while bees in steep terrain, to avoid
difficult returns while loaded, are expected to fly longer distances
uphill than downhill.
=====
Practical Guide
for organic beekeepers
http://www.grolink.se/epopa/publications/Beekeeping_Practical_Guide.pdf
...Bees prefer to work up hill
=====
Basic Beekeeping Operations
http://www.uky.edu/Ag/Entomology/ythfacts/4h/beekeep/basbeop.htm
If you are in hilly country, locate your hive in a valley.
Bees fly uphill for nectar and downhill when loaded with pollen
or nectar.
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