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OPERATION OF WATER SUPPLY SYSTEM The Intake Pumps at hake Mead are completely automatic and require no attend­ant* Pumps are started and stopped toy float control from the Booster Station* Reserveir* The starting and stopping of the pumps Is In measured sequence which Is governed toy the setting of the float switches to prevent exoeesive surge. Should all pumps stop at the Same time due to power failure the capacity of the surge suppressors is sufficient to prevent a dangerous strain on the pressure pipe line* These pumps require little maintenance work, and the Installation Is as simple and no different than that of any other deep well pump Installation* At the booster reservoir, in addition to the six float switches for the con* trol of the six Intake pumps, there is & float switch for the protection of the Rooster pumps* Should the intake pumps fail this float switch would cut out the boosterppumps before water in the Booster Station Reservoir became dangerously low. The booster pumps were designed for either float control from the Terminal Reservoirs, remote manual control or manual control at the pumps, The re­mote manual control hoard is now located in the eleotrlcal control house at the Magnesium Plant* These pumps are equipped with every electric and hy­draulic protection which may ever toe necessary, a complete description of which would toe too lengthy for this report. tfnlike the intake pumps, when starting or stopping, the timing relays for all the pumps in service are energised simultaneously with the time setting toeing set to effect the de­sired starting and stopping sequence* For our normal operation tout three pumps have been In service at one tlme| however the true maximum capacity of this station is reached when five pumps are in regular service and the sixth is used as a standby* In the discharge pipe from the Booster Pumps, just outside the building, there Is a venturi tube with a 17 inch throat connected with a meter in the pump room* The meter is a Builders Providence instrument of the recording, in­dicating and integrating type. Payments to the Colorado River Commission are based on readings taken at this meter* About four miles below the Terminal Reservoirs a 12 inch O.B* line takes out of the Ao Inch pressure main for water supply to Meganese Ores Company. The Manganese Ores supply is stored in a one million gallon tank, whose water surface ii k? feet six Inches lower than the inlet to the Terminal Reservoirs, The connecting pipe line and storage tank are the property of Manganese Ores Co* At present the Manganese Ores Company use about 1*25 million gallons per day* At the Terminal Reservoirs the kO inch pressure pips line enters a reinforced concrete box which is bifurcated to divided the flow between each reservoir* There is a gate at s&ch entrance to permit taking either reservoir out of service when necessary for cleaning or repairs* It has been found that algae grows rapidly in these reservoirs if it is not controlled, About three pounds of CuSOj, per million gallons of water will keeppthe algea under conln*el* The designed capacity of the Water Treatment Plant is twenty million gallons per day. Proper operation requires the services of the following personnel! 9