this horizontal drain system would be connected to a drainpipe to run DOWN along one side of the house to daylight at the street area. I believe the solution is to install horizontally across the backyard, a deep drain system between the high backyard area & the carport/garage so that heavy groundwater flow is intercepted before it reaches the carport/garage. Enough water seeps & runs thru those existing tiny slab cracks, that our garage floor starts to flood. With all the climate change related extreme weather events & long periods of heavy rain, we now have a new problem: after the high backyard ground becomes saturated from extended heavy rains, there appears to be high ground water pressure being exerted against/under the carport & garage SLAB, that water starts to push thru tiny surface cracks in the carport/garage cement. We already have the below-grade foundation retro-fitted with dimple board system draining to a footer drain pipe system that has solved the “wet basement” problem. Where can I find the best state-of-art guidance for constructing/installing an EXTERIOR “sump” type pump for exterior drainage pipes to drain ground water away from house? My house/yard is located near bottom of hill in our neigborhood & the “back yard” also is about 15′ above the part of the yard the house is built on.
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