Method for reservoir mixing in a municipal water supply system
One or more turbulent jet flows of fluid are discharged from inlet nozzles communicating with an inlet pipe to mix fluid in a reservoir, such as a water storage tank. The turbulent jet flows are directed to reach the surface of the fluid already existing in the reservoir. A horizontally disposed outlet section includes low loss contraction nozzles distributed throughout a lower portion of the reservoir to induce draining from all areas of the lower portion.
1. A method of mixing water in a municipal water supply reservoir, the reservoir holding a variable volume of water that varies between a low water level and a high water level as defined by a surface of the water, the method comprising the steps of:
positioning an inlet pipe and an inlet nozzle in the reservoir, the inlet nozzle communicating with the inlet pipe and being located below the low water level to be submerged in the water, wherein the inlet nozzle includes a reducer, an elongated nozzle pipe mounted to an exit end of the reducer, and a duckbill check valve mounted to an exit end of the nozzle pipe; and
discharging a turbulent jet flow of water from the inlet nozzle into the reservoir, wherein the turbulent jet flow of fluid is directed upward toward the surface of the water and reaches the surface of the water in the reservoir.
2. The method of claim 1 , wherein the step of positioning an inlet pipe and an inlet nozzle includes retrofitting an existing reservoir with the inlet pipe and the inlet nozzle.
3. The method of claim 1 , wherein the step of positioning an inlet pipe and the inlet nozzle includes arranging the inlet pipe to extend in a vertical direction until the inlet pipe reaches the inlet nozzle, wherein the inlet nozzle is located nearer to the low water level than to a bottom wall of the reservoir.
4. The method of claim 1 , wherein the step of positioning an inlet pipe and the inlet nozzle includes providing a plurality of inlet nozzles below the low water level, each of the plurality of inlet nozzles communicating with the inlet pipe, and wherein the step of discharging a turbulent jet flow of water includes discharging a plurality of turbulent jet flows of water each from a respective one of the plurality of inlet nozzles, each of the plurality of turbulent jet flows of water being directed upward toward the surface of the water and reaching the surface of the water in the reservoir at a unique location on the surface of the water.
5. The method of claim 1 further comprising the steps of:
positioning an outlet pipe and an outlet manifold in the reservoir below the surface of the water, the outlet manifold communicating with the reservoir and the outlet pipe and being located at an elevation lower than the elevation of the inlet nozzle; and
draining water from the reservoir through the outlet manifold and the outlet pipe.
6. The method of claim 5 wherein the outlet manifold includes a horizontally oriented outlet tributary pipe having a low loss contraction nozzle.
7. The method of claim 6 wherein the outlet manifold includes a plurality of horizontally oriented outlet tributary pipes each having a respective low loss contraction nozzle, and the low loss contraction nozzles are located apart from one another to induce drainage throughout the lower portion of the reservoir.
8. The method of claim 5 , wherein the outlet pipe differs from the inlet pipe.