Many residents in Los Gatos and nearby communities such as the Los Gatos mountain communities, Almaden Valley, Monte Sereno, Saratoga, the Cupertino foothills, etc. have sump pumps in their crawl space to pull off water that can accumulate below the house. Water can get there for a variety of reasons, such as reverse grading (the soil should slope gently away from the house, but in some cases the slope is unfortunately toward the house), downspouts not being extended to carry roof water away from the structure, or even underground water bubbling up from below (that’s a problem for a drainage expert, not a do-it-yourself job). These situations often happen during periods of heavy rain.
Like any other appliance, sump pumps come in all ranges of quality and performance from bare bones and portable to full of bells and whistles. They also get old and need maintenance from time to time, and they can fail. Some will turn on automatically, some must be switched on manually (assuming you are home to do it). Some run only on electricity, and will be no good to you during a power outage. Others come equipped with a battery backup.
If it’s been a long time since you have checked in on your sump pump, now is a good time to do it (or pay someone else to inspect it). Also check to see if the soil under the houses is graded or has channels to bring water to the sump pump. Also double check the downspouts to insure that they are carrying water away from your home / foundation. The best time to inspect all of this is before you need it. (Anyone with air conditioning knows how hard it is to get a service call on a malfunctioning AC unit during a heat wave!) Time to upgrade? I would suggest looking into sump pumps with battery backups so that it works even if the power goes off – that may be when you need it most. It would also be good to have one that can register water accumulating and turn on automatically.
Cracked Foundations, Adobe Clay Soils and Water in Silicon Valley (on the Valley of Heart’s Delight blog)
What is a cripple wall? (on popehandy.com)