Product description: surface runoff is the flow of water that occurs when excess water from rain, meltwater, or other sources flows over the earth's surface. This might occur because soil is saturated to full capacity, or because rain arrives more quickly than soil can absorb it. Surface runoff is a major component of the water cycle. It is the primary agent in soil erosion by water. Qt series tipping bucket flowmeter can be used to monitor no-pressure, low-head, and small discharge flow of surface or underground runoff. Qt-100050 double tipping bucket flowmeter features stainless steel, suitable for long-term use in extreme environmentdata logger achieves nema 6 and ip67 standard, suitable for outdoor usepower supply is simple, cr-2032 3v lithium battery, no need of solar panel and storage batterysuitable for monitoring of surface runoff and underground runoff specification tipping bucket flowmeter sensor type tipping bucket with magnetic reed switch output contact closure capacity 1000ml50ml cable length 3m size 600 mm * 260 mm * 500 mm material sus304 stainless steel aluminum alloy orifice diameter 50 mm weight 8 kg temperature measurement measurement range -20+70 accuracy 0.53050 resolution 0.1425 drift 0.1year response time 10 min, usually 90% (2ms air flow)