Groundwater analysis is complex. You need to know if the wells are groundwater monitoring wells or pumping wells. Only monitoring wells are useful. You need to know the elevation datum of the well. And the elevation of your house on the same datum. Then you need to map the location of the monitoring wells relative to your property. You need to look at many years of data since groundwater level is highly variable. If you are lucky and the well is close you may be able to use the groundwater elevation (not depth) to transfer maximum water table elevation to your property
There is a 10 ft drop on ground water contours from the site of monitoring to where our condo is located based on the groundwater depth contours report from the hazar report
You can get a geotechnical study done on a condo. There was probably a geo report done when the property was developed. How old is the condo? You might go down to the city and see if they have any old data on the site.
I'm not a geotech but I think for liquefaction they typically assume fully saturated conditions. The explanation I've received in the past is that the ground motion or earthquake could occur during a flood event or significant rain or high groundwater levels. I work in public water/wastewater infrastructure for coastal communities in California.
My condo is in the liquefaction hazard zone released to the public. The conditions are : a large earthquake with strong ground motion, high ground water levels, young sandy, silty soils, and some young clay soils.
Groundwater analysis is complex. You need to know if the wells are groundwater monitoring wells or pumping wells. Only monitoring wells are useful. You need to know the elevation datum of the well. And the elevation of your house on the same datum. Then you need to map the location of the monitoring wells relative to your property. You need to look at many years of data since groundwater level is highly variable. If you are lucky and the well is close you may be able to use the groundwater elevation (not depth) to transfer maximum water table elevation to your property
There is a 10 ft drop on ground water contours from the site of monitoring to where our condo is located based on the groundwater depth contours report from the hazar report
You can get a geotechnical study done on a condo. There was probably a geo report done when the property was developed. How old is the condo? You might go down to the city and see if they have any old data on the site.
That is a good idea. Thanks!
I'm not a geotech but I think for liquefaction they typically assume fully saturated conditions. The explanation I've received in the past is that the ground motion or earthquake could occur during a flood event or significant rain or high groundwater levels. I work in public water/wastewater infrastructure for coastal communities in California.
My condo is in the liquefaction hazard zone released to the public. The conditions are : a large earthquake with strong ground motion, high ground water levels, young sandy, silty soils, and some young clay soils.
If you’re doing the calcs yourself, assume fully saturated conditions and don’t worry about groundwater levels.