Abstract: A water inlet for transporting water that comprises an elongated body having a center portion formed with a plurality of radially projecting spokes and an exterior portion extending the length of the body and formed of spaced apart strips, with each of the strips fixed on the outer end of one of the spokes to define a plurality of longitudinally extending channels in the body.

Abstract: In association with a subsurface drainage/irrigation tile system, a head control stand is provided to selectively control the flow of water through a drainage/irrigation tile system and in turn control the depth of the water table. An actuating unit which includes a water level sensor floating on the surface of the water table is disposed within a riser pipe which extends upward from a subsurface drainage tile. A valve disposed within the drainage tile is connected to the water level sensor and opens upon the sensor raising in response to a raising in the water table which allows water to flow through the valve and subsequently closes the valve upon lowering of the water table.

Abstract: A ground probing radar method and apparatus which is effective to view the earth in advance of coal mining activity provides visual display of a coal seam and particular discontinuities that may lie therein. The system operates in the frequency range of 10 Megahertz to 5 Gigahertz. The received electromagnetic energy is amplified, sampled and band pass filtered with subsequent time gain amplification. A time analog return signal may be viewed directly and/or the return signal may be digitally processed to enable further signal refinement. A control microprocessor is utilized for both tape record control and digital signal processing, and the processor includes the capability for compositing and/or stacking of common source point data for output record and display.