HANDLING INSTRUCTIONS TECHNICAL PLAN DAN LANDSLIDES
Determination geohydrology Conditions(1)
Surface Water Surface water is a contributing factor to water which
will result in reduced soil shear strength on the ground, especially
when the unstoppable flow longsoran.Pola surface area can be analyzed
from topographic maps or photos udara.Air surface and depends on:a. Volume
of surface water that is affected by the - by the following factors: -
the intensity of rainfall-topography-vegetation-pemeabilitas state
land-surface springs volume of surface water runoff daribesarnya
obtained (run off), sedangkanbesarnyalimpasanyang terjadimerupakan
difference of the magnitude of bulk water infiltration hujandengan
kedalamtanah . b. Drainage
area (catchment area) drainage area can be determined by determining
the pattern of water flow permukaandari topographic maps or aerial
photographs. Setting
the boundaries of the area that affects the drainage area boundary
avalanches, dapatdilakukandenganmemplotkanpolaaliran surface. Broadly
divided into duabagian daerahpengalirandapat namely; daerahpengaliran
outside area longsorandandaerahpengalirandidalamdaerahlongsoran
Pengukurandaerahpengalirandapat dilakukanantaralaindenganbantuan
planimeter. Danvolumeairpermukaandan
vast drainage area can be calculated water discharge permukaanuntuk
avalanche mitigation planning with surface drainage.(2)
Water TanahKondisi groundwater affecting slope stability can be
evaluated from hasilpengamatan test wells, boreholes and pisometer in
the following manner: - Studying the geological cross-section techniques
to determine the location of the groundwater table, layers - layers and
layers of water-resistant carrier air.Muka groundwater
free from their pemoran masingtitik connected to obtain
surface-groundwater bebas. In geology section layout techniques are also
included as well as the depth pisometer pori.Bila high water pressure
pore water pressure in accordance with the water level tanahbebas
(phreatic line), then the condition of the soil water groundwater is free. Bilatekanan
pore water is not suitable denagn water table free then this condition
is groundwater artesis. If there is only water-free soil, the avalanches
that occur are influenced by surface water that seeps into the soil to
groundwater free.
If the temporary groundwater, soil water and artesian water freely affecting the stability of the slope, then the avalanche occurs is influenced by surface water and artesian water. - If there is only affecting the stability of artesian water, which means avalanche airartesis.Dengan know terjadihanya influenced by soil water conditions the avalanche region, the division geohydrology conditions can be classified into 3 parts yaitusebagai following:a.Klasifikasi I, are affected by avalanche surface water that seeps into the water tanah.b. Classification II are affected by avalanche combination of water-free soil, groundwater and groundwater while artesis.SketsaDaerah Streaming
If the temporary groundwater, soil water and artesian water freely affecting the stability of the slope, then the avalanche occurs is influenced by surface water and artesian water. - If there is only affecting the stability of artesian water, which means avalanche airartesis.Dengan know terjadihanya influenced by soil water conditions the avalanche region, the division geohydrology conditions can be classified into 3 parts yaitusebagai following:a.Klasifikasi I, are affected by avalanche surface water that seeps into the water tanah.b. Classification II are affected by avalanche combination of water-free soil, groundwater and groundwater while artesis.SketsaDaerah Streaming
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