Add boreholes

content/post/borehole_and_wellpoints.md

@@ -15,14 +15,48 @@ title: "Boreholes and wellpoints"
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 Underground water is without dubt one of the best source of fresh water you can use assuming there is a water tanble or an aquifer in your area, and it's not uncommon
 to have potable water directly from the source without any filtering at all.
 
-Source water from underground can be done by drilling a borehole or by digging a wellpoint. There are many differences in those two, and the quality of the water is also different.
+Source water from underground can be done by drilling a borehole or by digging a wellpoint. There are many differences between them, and the quality of the water is also different.
+
+## Wellpoint
+
+A Wellpoint is a shallow hole ( usually 8 to 12 meters ), sometime open on top, that permit to harvest water from the first table water or just from saturated sand using just a summersible pump or even a buck in some hold wells.
+
+![wellpoint](/img/wellpoint.jpg)
+![wellpoint schea](/img/wellpoint-diagram.jpg)
+
+
+In a drought area a wellpoint can dry easily as the layer ground water evaporate quickly in absence of water.
+
+Furthermore, the shallow water of a wellpoint is more exposed to polluttant both coming from the air or by falling in the hole ( if it's open on top ) or, more dangerously, from infiltrations on the ground or even from sawages lines. A Wellpoint is also exposed to higher risks of bacterial concentration.
+
+For those reasons a wellpoint harvested water is also more subjected of changing in time, and therefore you must be very carefull if you intend to use it as a source for drinking water.
+
+The pro of a wellpoint is that it's easier to digg and cheaper than a borehole, and in many areas you can easily find already existent wellpoints since ages.
+
+## Borehole
+
+A borehole is a deeper hole done usually by a drilling rig suitable also for rocky areas and goes to 20 or more meters up to more than 100 meters to harvest water from the second or the third water table.
+
+It needs a pump to extract water, and it's closed on top. 
+
+![borehole](/img/borehole2.jpg)
+
+
+Borehole water is often already potable, and if the conduct inserted in the hole is well done there are very small risks to have infiltrations from the shallow levels.
+
+The bad part is that it's very expensive to hire a drilling rig, and the pump will also need electricity to run.
+
+## Water quality
+
+In any case, both boreholes and wellpoints presents different risks that can't be overstimated, for that reason a constant monitoring of the water quality by doing chemical tests at regular intervals is something to be marked as a "MUST DO".
+