GENERAL DESIGN OF CANALS Flashcards
TRAPEZOIDAL IS THE MOST ACCEPTED SHAPE FOR EARTHEN CANALS
TRUE
SIDE SLOPES OF 3:2 FOR SMALLER CANALS AND LATERALS AND 4:2 FOR LARGER CANALS IS GENERALLY ADEQUATE FOR MOST EARTH MATERIALS AND SHOULD BE CONSIDERED WHEN DETERMINING THE SIDE SLOPES OF CANALS
TRUE
3.0 FPS FOR SMALLER CANALS UP TO 1.5 FPS FOR LARGER ARE THE RANGE OF PERMISSIBLE VELOCITIES CONSIDERED FOR SIZING A CANAL WATER SECTION
FALSE
WHAT CONSIDERATIONS MUST BE MADE WHEN CANAL CONSTRUCTION IS TO UTILIZE CUT AND FILL METHODS
ALL OF THE ABOVE
STEEL FLUMES ARE SELDOM USED TODAY DUE TO HIGH MAINTENANCE COSTS
TRUE
ALONG UPHILL TERRAIN CONCRETE BENCH FLUMES ARE MOST COMMONLY USED
FALSE
WHAT SHAPE OF FLUME GIVES THE MAXIMUM VELOCITY FOR A GIVEN AREA
ONE THAT HAS A BOTTOM WIDTH 2 TIMES THE DEPTH OF THE WATER
ENCOUNTERED FALLING ROCK AND DEBRIS ARE IDEAL CONDITIONS TO MAKE PRECAST CONCRETE PRESSURE PIPE FOR FLUME SERVICE
TRUE
BURIED PRECAST CONCRETE PIPE AND MONOLITHIC CONCRETE PIPE ARE CONSIDERED COMMON TYPES OF CONSTRUCTION FOR SIPHON SERVICE
TRUE
WHY IS CONCRETE PIPE PREDOMINATELY USED FOR CANAL SIPHONS
ALL OF THE ABOVE
MONOLITHIC CONSTRUCTION IS GENERALLY CONSIDERED FOR SIPHONS SMALLER THAN 96 INCHES IN DIAMETER
FALSE
FACTORS THAT DICTATE CONSTRUCTION OF ELEVATED STEEL PIPE SIPHONS COULD BE WHERE COSTLY ROCK EXCAVATION IS ENCOUNTERED AND LIMITED SPACE FOR HANDLING RIVER FLOWS DURING CONSTRUCTION
TRUE
WHAT ESSENTIAL DESIGN FEATURES IN ADDITION TO THE PIPE ITSELF MUST BE CONSIDERED FOR INVERTED SIPHONS
BOTH A AND B
INLET AND OUTLET TRANSITIONS
BLOWOFF STRUCTURES
INLET AND OUTLET TRANSITIONS SERVE FOR THE PURPOSE OF MAXIMIZING HEAD LOSS AND EROSION DAMAGE
FALSE
A PUMP TYPE GRAVITY TYPE AND PRESSURE TURNOUT TYPE ARE ALL CONSIDERED BLOWOFF STRUCTURES
TRUE
WHEN FEASIBLE BLOWOFFS SHOULD BE LOCATED AT THE LOW POINTS OF SIPHON WHERE WATER IS DRAINED INTO NATURAL DRAINAGE CHANNELS
TRUE
TO DISLODGE SEDIMENT AND DEBRIS THAT MAY BECOME PACKED IN THE DISCHARGE LINE IMMEDIATELY UPSTREAM OF THE BLOWOFF VLV IS THE PURPOSE OF THE HIGH VELOCITY JET UTILIZED IN SOME GRAVITY BLOWOFFS
TRUE
TO CONVEY WATER OVER RELATIVELY STEEP SLOPES TO LOWER GRADES AND WATER SURFACES IN CANALS OR LATERALS IS THE PURPOSE OF CHUTE(DROP)
TRUE
WHAT PURPOSE DO THE CONTROLLED NOTCH OR STOPLOGS SERVE IN THE INLET TRANSITIONS OF DROPS AND CHUTES
PREVENTS DRAWDOWN AT THE ENTRANCE THAT WOULD CAUSE EROSION OF CANAL BANK
IF MAXIMUM VELOCITIES ARE MORE THAN 3.5 FPS AN OUTLET TRANSITION IS GENERALLY NOT NEEDED
FALSE
BY PROVIDING A DEPRESSED SECTION OF PIPE AHEAD OF THE OUTLET TRANSITION IS HOW SUPERCRITICAL VELOCITIES ARE DISSIPATED IN PIPE DROPS
TRUE
WATER HAMMER IS A REASON WHY OPEN TYPE STILLING POOLS OR IMPACT BASIN UTILIZED IN THE DESIGN OF OUTLET TRANSITIONS FOR PIPE CHUTES
TRUE
WHAT IS THE PREFERRED SHAP OF A MONOLITHIC REINFORCED CONCRETE CHUTE
RECTANGLE
BESIDES STOPLOGS SIPHONS ARE DEVICES USED TO CONTROL WATER LEVELS AT THE INLET TRANSITION OF MONOLITHIC REINFORCED CONCRETE DROPS AND CHUTES
FALSE
THE ENERGY DISSIPATED BY THE BLOCKS CONSTRUCTED ALONG THE FLOOR OF THE CHUTE IS HOW THE CONVENTIONAL STILLING POOL IS UTILIZED IN THE BAFFLED DROP
FALSE
CROSS DRAINAGE STRUCTURES SERVE THE PURPOSE TO PROTECT CANAL FROM DAMAGE DUE TO MOSS AND ALGAE
FALSE
RELATIVE CAPACITY OF CANAL WITH RESPECT TO DRAINAGE FLOWS AND CANAL WATER SURFACE WITH RESPECT TO NATURAL GROUND SURFACE DICTATES THE NEED OF CROSS DRAINAGE
TRUE
WHERE THE CANAL IS CARRIED ACROSS A NATURAL DRAINAGE CHANNEL UPON AN EMBANKMENT IS WHN CULVERTS ARE USED FOR CROSS DRAINAGE
TRUE
FOR LARGE CANALS WHAT STORM FREQUENCY IS USED TO DEVELOP CULVERT SIZE
100 YEAR STORM FREQUENCY
THE PURPOSE THAT PIPE COLLARS SERVE IN CULVERT CONSTRUCTION IS TO PREVENT WATER HAMMER IN THE DISCHARGE LINE
FALSE
WHAT CONDITIONS DICTATE THE USE OF AN OVERCHUTE
ALL OF THE ABOVE
WHEN THE AMOUNT OF DRAINAGE WATER IS LARGE BY COMPARISON TO THE CANAL IS WHAT MAKES DRAINAGE INLETS ACCEPTABLE
FALSE
2 IMPORTANT FACTORS THAT DICTATE THE PLACEMENT OF A DRAINAGE INLET INTAKE ARE THE INTAKE MUST BE LOCATED BELOW THE MAXIMUM WATER SURFACE ELEVATION OF THE CANAL AND AT THE NATURAL GROUND LEVEL SURFACE
FALSE
FLOW CONTROL AND FLOW MEASUREMENTS ARE CONSIDERED BASIC FUNCTIONS THAT A TURNOUT MUST PROVIDE
TRUE
WHAT DEVICES ARE GENERALLY EMPLOYED FOR FLOW CONTROL AT TURNOUTS
-SLIDE GATES
-LIFT GATES
-RADIAL STEEL GATES
PARSHALL FLUME AND CIPALLETTI WEIR ARE 2 MEASURING STRUCTURES PREDOMINATELY USED IN SMALL TURNOUTS
TRUE
WASTE WAYS SERVE THE PURPOSE SO THAT THEY ARE UTILIZED TO DISPOSE OF UNWANTED EXCESS WATER FROM CANALS AND TO SAFELY EMPTY CANALS IN CASE OF CANAL BREAK OR OTHER EMERGENCIES
TRUE
A SUDDEN DECREASE IN DISCHARGE WHEN THE SIPHON PRIMES IS DETRIMENTAL TO THE WASTE WAY CHANNEL AND WOULD BE CONSIDERED A DISADVANTAGE OF SIPHON SPILLWAYS
FALSE
OVERFLOW SPILLWAY WITHOUT GATE CONTROL IS THE TYPE OF WASTE WAY CONSTRUCTION THAT IS GENERALLY PREFERRED
FALSE
CHECKS SERVE THE PURPOSE TO CONTROL THE FLOW OF WATER IN A CANAL WHEN IT IS OPERATING AT PARTIAL CAPACITY
TRUE
2 GENERAL TYPES OF CHECKS USED IN SMALL CANALS ARE THOSE UTILIZING FIXED CONCRETE CHECKS AND FLASHBOARDS FOR REGULATION
TRUE
RADIAL GATE CHECKS OF THE CALIFORNIA AQUEDUCT ALWAYS EMPLOY OVERFLOW WEIRS
FALSE
