I maaaay have just gone full SCADA on my sump pump.pic.twitter.com/YUDD2RhRNM
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As I dug closer to the source, the water was coming so hard that it was actually squirting an inch or two in the air from the bottom of the excavation!
After the initial rush settled down I dug a bit deeper and found the cause: a shoddily installed ABS gutter downspot that was slipped over the end of a PVC pipe with no attempt at a seal. The ABS was cracked and the PVC was almost certainly clogged, so it all needs to be redone.pic.twitter.com/McwVZuGB9R
Since the water coming off the roof couldn't get out to the sewer, it leaked out at this joint (a foot from the house), saturating the ground all along the exterior wall.
After a bit more digging to direct sump pump runoff into the trench, it appeared that the immediate danger of flooding was gone. The next step was to improve monitoring and alerting so that if it came back, I'd be able to respond rapidly before too much flooding occurred.
The parts I ordered after the Christmas flooding incident had come in, so I set to work building a proper monitoring system. I started with a DIN rail mount kit for a Raspberry Pi, a couple of I/O boards, and a 4-20 mA submersible liquid level sensor. Here's the dev setup.pic.twitter.com/9ngVHzesr7
Note the water on the floor in the bottom right corner of the previous pic. That's not spillage from the bucket I was testing the sensor on, that's an active leak into my lab. I also grabbed a Gentex horn/strobe and some water-sensing cables to place along walls in trouble spotspic.twitter.com/XvwvhWa5eU
The only remaining step was to code up a nice touchscreen HMI to crunch the data. It collects water level measurements at 1 Hz, does some averaging to reduce noise, then calculates tank volume and flow rate in L/hr.pic.twitter.com/QH79c5Ka8l
I plan to also track pump duty cycle over the long term (seconds on vs off over the past hour or something). Current/planned alarm conditions include water on the floor, tank level above the float, and flow rate approaching the pump's capacity.
Then the only remaining piece will be adding logging so I can collect trends over time and test effectiveness of outdoor drainage upgrades, and installing a 24V UPS so that I still get alarms even if the power goes out.
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