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H313 Hydrology and rainfall apparatus

产品时间:2022-03-04 11:17:19

简要描述:

A self-contained, fl oor-standing unit consisting of a water reservoir and a tankfor sand with overhead spray nozzles that simulate rainfal, both stationary andmoving. It is for studying hydrology pri

详细介绍

A self-contained, fl oor-standing unit consisting of a water reservoir and a tank for sand with overhead spray nozzles that simulate rainfal, both stationary and moving. It is for studying hydrology principles, including rainfall, throughfl ow and the movement of water over land and rivers.

Key features 

• Permeable catchment area fed with ‘rain’ from overhead spray nozzles and/or by groundwater fl ow from ends of tank 

• Spray nozzles to supply half or all of catchment area 

• Piezometer tappings to measure water table profi le 

• Can measure ‘drawdown’ due to single or two interacting wells 

• Adjustable inclination of catchment area angle 

• Includes fl ow meter to measure fl ow to the catchment area 

• Run-off and well fl ows measured by calibrated rectangular weir 

• Self-contained – requires only an electrical supply

Description 

The apparatus is a sturdy metal frame which holds a large rectangular stainless-steel tank (catchment area) and a reservoir tank. Students can fi ll the catchment area with a granular medium (not included) to form a permeable catchment area. A jacking mechanism allows adjustment of the angle of the catchment area. 

Above the catchment area is a frame that holds spray nozzles which simulate rainfall on the catchment. A valve selects all or half the nozzles. Students can use this facility to vary the lag time on a hydrograph or to simulate a moving storm. 

At each end of the catchment area are end compartments, separated from the catchment by weir plates with porous ‘port holes’. Students can open the port holes to drain water from the catchment area, or to supply water to it from the end compartments. 

In the middle of the catchment area are two ‘wells’ for experiments with water wells. A row of 20 tappings along the centre line of the catchment area allows students to measure the water table profi le. Each tapping has special slotted ends to stop the permeable media entering its pipe. The tappings connect to a bank of piezometer tubes at the front of the catchment area. 

A pump takes water from the reservoir and feeds it to the overhead nozzles and to the ends of the catchment area. Students can vary the fl ow to the nozzles and tank. A fl ow meter measures the overall flow. 

Students can use a calibrated rectangular weir under the catchment area to measure fl ow from the wells or the tank. 

The apparatus is completely self-contained and needs only a mains electrical supply. The permeable medium is not included with the apparatus, but TecQuipment off ers a suitable grade of sand as an essential ancillary.

Recommended Ancillary 

• 800kg Permeable Medium (H313a) – Washed, graded sand, 0.5 mm to 1.5 mm

Learning Outcomes 

• Investigation of rainfall/run-off relationships for dry, saturated and impermeable catchments of various slopes (surface run-off only) 

• Eff ect of interfl ow on outfl ow hydrograph surface runoff (plus groundwater flow) 

• Simulation of multiple and moving storms 

• Measurement of cone of depression for a single well and comparison with theory interaction of cones of depression for two adjacent wells 

• De-watering of excavation sites by use of wells 

• Flow from a well in a confi ned aquifer 

• Demonstration of watersheds for a simulated island with rainfall and well flows 

• Sediment transport and meanders in simulated rivers 

• Studies of scour around simulated bridge piers 

• Demonstration of erosion caused by water through flow


 


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