PNS/BAFS/PAES 227:2017; 228:2017; 230:2017
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23 Terms
Design of a Small Reservoir Irrigation System
PNS/BAFS/PAES 227:2017
PNS/BAFS/PAES 227:2017
maximum average contact pressure between the foundation and the soil which should not produce shear failure in the soil
bearing capacity
PNS/BAFS/PAES 227:2017
maximum area which an irrigation project can serve considering the extent of arable lands and the available water supply
design irrigable area
PNS/BAFS/PAES 227:2017
method to determine the rate of flow under laminar flow conditions through a unit cross sectional are of soil under unit hydraulic gradient
permeability test
PNS/BAFS/PAES 227:2017
area capable of being irrigated, principally as regards to availability of water, suitable soils, and topography of land
potential irrigable area
PNS/BAFS/PAES 227:2017
occurrence or frequency of earthquakes in a region
seismicity
PNS/BAFS/PAES 227:2017
River bed and banks profile and cross sections at least _____ upstream and downstream from dam axis or as required.
2.0 km
PNS/BAFS/PAES 227:2017
SRIS data collection frequency for seepage
daily
PNS/BAFS/PAES 227:2017
SRIS data collection frequency for settlement/deflection
6 months
PNS/BAFS/PAES 227:2017
height
15 to 35 m
Design of a Rockfill Dam
PNS/BAFS/PAES 228:2017
PNS/BAFS/PAES 228:2017
internal erosion induced by regressive erosion of particles from downstream and along the upstream line towards an outside environment
piping
PNS/BAFS/PAES 228:2017
dam that relies on rock, either dumped in lifts or compacted in layers, as a major structural element where an impervious membrane is used as the water barrier and can be placed either within the embankment or on the upstream slope
rockfill dam
PNS/BAFS/PAES 228:2017
The velocity of flow of dam face shall be within ____ with reliable protection measures against scouring.
5 m/s to 7 m/s
PNS/BAFS/PAES 228:2017
For a sound rock foundation, a minimum depth and width of ____ cutoff shall be required
1m
PNS/BAFS/PAES 228:2017
The recommended minimum width of the dam is _____.
4 m
PNS/BAFS/PAES 228:2017
consists of a well-graded mixture of hard and durable particles, and slightly weathered to fresh rock to secure the stability of dam body
rockfill zone or pervious zone
PNS/BAFS/PAES 228:2017
composed of semi-pervious materials
filter zone
PNS/BAFS/PAES 228:2017
The acceptable leakage volume is ____ of the storage capacity
0.05%
PNS/BAFS/PAES 228:2017
Filter material shall not be cohesive and shall not contain silt and clay particles more than ___
5%
Design of a Check Dam
PNS/BAFS/PAES 230:2017
PNS/BAFS/PAES 230:2017
small barrier built across the direction of water flow on shallow rivers and streams intended to convey runoff during peak flow and to slow and hold surface water long enough for the water to deposit sediment it is carrying; facilitates irrigation by using the upstream bay of the dam as pump sump
check dam
PNS/BAFS/PAES 230:2017
stones wrapped in wire fence meshes for added stability and strength
gabion