. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN 906, TJ. S. DEPARTMENT OF AGRICULTURE. with valves as in the common orchard hydrant. The auxiliary pipe acts as an overflow and is cemented to the outlet pipe, permitting the excess of water to flow down the pipe line to the next hydrant. A small spillway connects the two stands, the spillway being set high enough to alio T a few inches head on the gates set in the upper stand (fig. 10). A modification of this hydrant is fitted with lift gates, so that all the water may flow down the pipe line and not be fo
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 50 BULLETIN 906, TJ. S. DEPARTMENT OF AGRICULTURE. with valves as in the common orchard hydrant. The auxiliary pipe acts as an overflow and is cemented to the outlet pipe, permitting the excess of water to flow down the pipe line to the next hydrant. A small spillway connects the two stands, the spillway being set high enough to alio T a few inches head on the gates set in the upper stand (fig. 10). A modification of this hydrant is fitted with lift gates, so that all the water may flow down the pipe line and not be forced to spill over the waste- way of each valve. Others have no gates, all the water being forced to rise in each stand and overflow into the pipe line. Where the valves are set on a long lateral that runs down on a steep grade, it is usually necessary to provide gates in the pipe line so water can flow unob- structed to any set of valves. Another type of overflow hydrant is constructed by placing a partition wall in a single length of pipe. The water is forced over the partition wall when operating and spills over into the outlet to the next valve. Small outlet gates that feed the furrows are set in the inlet chamber, the presssure on the gates depending upon the height of spillway above them. The third type is made of one large stand, consisting of one joint of concrete pipe having a pipe of smaller diameter set inside. The small pipe acts as the spillway and is connected to the outlet pipe. When these valves are constructed properly they are nearly ideal for irrigating side-hill orchards, where only a small stream is re- quired to each furrow. They are well adapted to contour and ter- race plan of Fig. 34.—Plain relief stand. Standpipe is high enough to insure pressure on field hydrants above it. Excess pres- sures on pipe line impossible, as standpipe will overflow when all orchard valves above are Please note that these images are extracted from sca
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