BS EN 15843:2010 pdf download

BS EN 15843:2010 pdf download.Water quality – Guidance standard on determining the degree of modification of river hydromorphology.
3.6
braiding
oourse of a river naturally divided by deposited sediment accumulations, charactetised by at least two channels which often change their course regularly
(EN 146142004, 2.8)
3.7
compaction
consotidation of the rivet bed through physical, chemical or b.oiogical processes
(EN 146142004. 2.10)
culvert
arched, enclosed or piped structure constructed to carry water under roads, railways and buildings
3.9
eco4ogical status
expression 04 the quality of the structure and functioning of aquatic ecosystems, expressed by comparing the prevailing conditions with reference conditions
NOTE As classhed in accordance with Annex V 01 the EC Water Framework Directive.
lEN 146142004, 2.12)
3.10
floodplain
valley floor adjacent to a flyer Ihat is (or was historically) Inundated periodically by flood waters
[EN 146142004. 2,14)
3.11
gablon
wire basket containing stones, used for river-bed or bank protection
(EN 146142004. 2.16)
3.12
hard materialsengineering
bank protection using artificial matenals such as concrele, sheet piling or bridi.S
NOTE See oft materials
3.13
hydromorphology
physical and hydrological characteristics of rivers including the underlying processes from which they result
(EN 14614:2004, 2.18J
3.14
hydro-peaking
rapid and frequent fluctuations in flow resulting from hykopower generation to meet peak demands in electricity
3.15
lateral connectivity
freedom for water to move between the channel and the floodplain
[EN 14614:2004, 2.19)
3.16
lateral movement
freedom for a river channel to move across a floodplain
[EN 14614:2004, 2.201
3.17
planterm
view of flyer pattern from above (e.g. sinuous, straight)
[EN 14614:2004, 2.221
3.18
reach
maior sub-division 01 a river, defined by physical, hydrological, and chemical character that distinguishes it from other parts of the river system upstream and downstream
[EN 14614:2004, 2.251
3.19
reference conditions
conditions representing a totally undisturbed state, lacking human impact, or near-natural with only minor evidence of distortion
NOTE For waters not designated as heavily moc5fied or artificial, synonymous with Thigh ecological status in the Water Framework Directive.
[EN 14614:2004. 226)
3.20
regrading
river widonrng and deepening and modifying the bed and bank proliles to accommodate Increased flows
3.21
reinforcement
slrengthenang of river beds and banks for various purposes (e.g. ford construction. erosion control) using materials such as boulders, sheet piling, geotextiles, etc.
3.22
residual flow
tiow remaining ii a river alter abstraction (e.g. br hydropower generation, water supply, etc.)
3.23
riparlan zone
area of land adoining a river channel (including the river bank) capable of directly influencing the condition of the aquatic ecosystem (e.g. by shading and leaf lifter input)
(EN 146142004. 2.291
NOTE In this European Standard, the term nparian zone does not include the widar fioolain.
3.24
river type
group of flyers that can be broadly differentiated from other groups on the basis of their physical and chemical characteristics (e.g. lowland chalk streams; upland ultta-oligoitophic rivers)
(EN 146142004. 2.321
3.25
sheet piling
matenai used for vertical bank protection (e.g. corrugated metal sheets)
(EN 146142004, 2.34J
3.26
sinuosity
degree of deviation from a straight line, defined as channel lengthNalley length
(EN 146142004. 2.361
3.27
soft malerials’engineering
bank protection using biodegradable materials such as brushwood, reeds or live willows
NOTE Sea hard malerlals,
3.28
substrate
material making up the bed of a river
(EN 146142004. 2.401
3.29
weir
structure used for controlling flow and upstream surface level, or for measuring discharge
(EN 146142004, 2.41J
3.30
willow spiling
method of soft engineering used for strengthening river banks using retaining walls constructed of woven wilow stems from which trees will sprout
3.31
woody debris
dead woody material that falls into rivers and streams. ranging in size from leaf fragments (fine woody debns) to anches or whole trees (coarse woody ddebris)