knowledge exchange mission suswa project 2014 - case study group 2
TRANSCRIPT
GROUP 2: Description of hydro-geological profile between
borehole to river
Group Members: Mr. Daniel Kurao, Paul Memusi, Eric
Kariuki, Wesley Langat, Samwel Jakinda.
Group 2 Question:
Add all relevant information to the hydro-geological profile from borehole to river and
discuss the potential relationships between the different water levels
Desk Review
• Google map information on geology of sultan hamud yielded
– Volcanic ash, breccia and agglomerate then an infusion of
clay towards the gully from Olmeliai
– Red soil from gully to river bank
– Sand at river
– Volcanic overlaying gneisses with fractures
Olmeliali geology.jpg
Transect walk (Geological observations)
• Physical observations largely matched desktop review findings i.e.
from Olmeliai borehole
– Red soil-transitioning to clay soil and then red soil then black near
Kwa chief then red soil towards the river. There was sand in the
river.
– Stones found on the surface during transect walk were largely
igneous volcanic and metamorphic gneisses.
– Stones collected at the river (add picture)
– Bassalts found in gulley
Findings of Olmeliai to Selengei profile
• 16 waypoints were marked with the gps equipment
• Information about the points were noted in the field and
transferred on an excel spreadsheet waypoints-suswa
group 2.xls
• The excel sheet was transferred to Google earth through an
application.
• A profile was then generated from Google earth. Ormoliai to
Selengei river profile group 2.kmz
Findings
• Elevation at Olmeliai borehole is
1320m a.s.l.
• Borehole drilled to 200m
• Water rest level at borehole is
46m
• Riverbed elevation is 1291m
a.s.l
• Shallow well at the river bank
has a total depth of 50m
Discussion
• The difference in height between the borehole and the riverbed is 29m.
• The water rest level of the borehole is 46m
• The borehole is 171m below the riverbed
• The shallow having been drilled to 50m, gives a height different of 79m
between the borehole and the shallow well depth
• The shallow well is being recharged by the river.
• In conclusion, it can be assumed that the river can possibly be
recharging the borehole.