P5 02/12/191-1000yr Flood Level added to Section TBP JP
P6 18-12-19Layout updated TBP JP
P7 20-01-20Layout updated TBP JP
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22.00
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21.00
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20.00
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1 in 100-yr + 20% Flood level (21.46m AOD)
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1 in 100-yr Flood level (21.26m AOD)
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1 in 20-yr Flood level (20.78m AOD)
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1 in 10-yr Flood level (20.57m AOD)
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1 in 100-yr + 40% Flood level (21.66m AOD)
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Finished Road Level 22.00m AOD
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Finished Floor Level 21.96m AOD
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1 in 50-yr Flood level (21.06m AOD)
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Lagoon Floor Level 21.05m AOD
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Flood water will eminate from the River Welland and spread across the water meadows to the south of the development. Greater than 1 in 20-year (5% likelihood) events cause some flooding of the lower level of the access road. Culverts through the road embankment will allow flood water to both propogate and recede to/from land north of the road embankment. Flood Plain Compensation works are proposed either side of the road to mitigate for the volumes occupied by the development and the road embankment. Additional compensation volume is reserved in the Lagoon for 1 in 100-year Flood Events, whilst more extreme events will also cause flooding of some car-parking areas.
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Receding Flood Water will drain back through the culverts to return to the River Welland. Once flood waters have receded, the retained water in the Lagoon will return through a dedicated drainage line, which will include a flap-valve to prevent flood water's entering the Lagoon prematurely.
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1 in 1000-yr Flood level (21.71m AOD)
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BROKEN
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ACO
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PRF
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20.73
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POST
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21.54
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21.32
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20.60
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20.52
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20.49
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20.47
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20.47
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20.48
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20.51
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20.61
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20.59
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20.56
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20.59
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20.55
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20.56
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20.57
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20.65
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20.63
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20.60
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20.56
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20.55
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20.57
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20.60
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20.67
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21.08
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20.64
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20.46
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20.45
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20.55
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20.60
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20.45
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20.57
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20.70
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21.18
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21.41
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21.41
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21.38
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21.33
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22.93
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22.45
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22.54
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22.02
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22.07
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22.11
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22.13
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21.66
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21.71
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21.58
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21.68
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21.09
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21.60
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21.43
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21.55
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21.61
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20.88
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21.90
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21.06
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20.63
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20.63
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20.66
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21.82
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DROP KERB
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21.91
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21.99
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EMP
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21.64
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21.76
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21.87
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21.98
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22.10
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22.17
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22.28
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22.33
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22.25
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21.66
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G
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21.64
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G
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21.83
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G
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21.49
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21.62
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21.67
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21.69
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21.76
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21.81
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21.83
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21.83
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LP
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CL 21.74
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IC
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NAME PLATE
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RS
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21.66
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21.83
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21.87
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LP
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22.11
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21.78
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21.63
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21.62
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21.58
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21.59
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21.58
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21.59
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21.59
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BB
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BOLLARD
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BT
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23.17
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CHNL
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23.19
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22.07
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CONCRETE
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21.77
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21.65
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21.64
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21.61
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21.61
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21.95
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22.11
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22.13
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DROP KERB
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21.99
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22.02
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22.06
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22.69
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D.P.C.
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EMP
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FH
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22.36
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22.34
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23.31
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23.10
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22.93
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22.68
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22.55
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22.43
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22.32
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22.22
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GATE
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GATE
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GATE
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GATE
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GATE
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GATE
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GATE
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GATE
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GATE
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IRON RAILING
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IRON RAILING
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IRON RAILING
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22.22
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22.27
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22.32
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22.30
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LP
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LP
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LP
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CL 21.90
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IC
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CL 22.30
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IC
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CL 22.73
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IC
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21.61
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21.62
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21.60
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21.64
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21.65
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21.70
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22.03
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22.07
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PRF
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21.37
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21.57
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POST
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POST
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POST
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RS
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RS
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RS
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22.11
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22.11
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22.11
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22.11
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21.88
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21.88
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21.88
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21.88
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21.88
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21.88
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21.87
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21.88
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21.88
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21.88
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21.88
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21.88
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21.88
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21.58
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21.58
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21.58
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SAPLING
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SAPLING
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SAPLING
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SAPLING
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21.93
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22.17
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22.27
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22.37
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SV
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21.61
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21.65
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21.74
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21.79
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21.93
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22.05
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22.13
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22.18
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22.28
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22.18
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TB
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G0.70
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S3.00
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H7.00
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FENCE
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6508-1
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503601.587
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307097.575
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21.799
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6508-16
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503647.023
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307153.514
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23.409
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6508-19
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503678.790
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307151.323
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21.175
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6508-21
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503605.489
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307093.289
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21.668
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6508-23
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503603.839
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307093.163
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21.740
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6508-50
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503630.269
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307093.442
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21.328
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6508-8
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503600.173
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307101.014
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21.823
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6508-9
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503584.170
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307131.848
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22.290
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G0.80
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S5.00
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H12.00
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30.86
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19.95
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BB
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20.43
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20.50
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20.55
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BB
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FENCE
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POST
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POST
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POST
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POST
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21.52
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21.08
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20.65
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20.66
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20.78
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20.73
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20.68
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20.66
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20.76
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20.72
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20.65
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20.55
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20.63
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20.92
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21.05
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21.64
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21.84
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21.20
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20.89
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20.94
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20.99
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20.92
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20.97
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21.02
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21.04
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21.02
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20.96
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20.80
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20.91
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21.07
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21.09
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21.10
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21.09
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21.30
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21.24
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21.11
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21.14
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21.06
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21.13
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21.03
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21.30
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21.04
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20.64
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20.52
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20.51
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20.49
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20.59
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20.63
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20.47
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20.56
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20.54
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20.55
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20.61
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20.55
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STUMP
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21.03
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TB
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20.75
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20.63
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20.54
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20.77
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TB
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20.61
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20.67
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20.73
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TB
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20.58
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TB
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21.52
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20.94
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20.78
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20.83
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20.76
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21.68
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PRF
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21.72
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21.84
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21.82
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21.90
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21.88
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PRF
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21.61
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21.79
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21.80
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21.86
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21.78
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PRF
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21.75
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21.81
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21.87
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21.89
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21.88
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PRF
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21.97
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22.20
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22.65
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23.02
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23.30
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PRF
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21.55
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21.73
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34.13
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RIDGE
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33.16
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RIDGE
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30.62
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27.66
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EAVE
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29.69
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31.77
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RIDGE
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34.03
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RIDGE
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34.04
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RIDGE
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31.78
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RIDGE
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27.67
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EAVE
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30.37
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27.64
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EAVE
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21.40
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21.36
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21.34
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20.96
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20.78
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20.68
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20.74
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20.62
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20.60
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20.62
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20.58
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20.61
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20.59
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20.67
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20.63
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20.67
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20.77
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20.72
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20.80
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IRON RAILING
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22.11
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22.10
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22.96
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22.78
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22.52
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22.40
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22.34
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22.21
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22.20
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22.13
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22.00
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22.02
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21.48
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21.60
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21.73
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21.81
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22.16
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22.19
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22.16
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22.11
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22.00
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DROP KERB
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22.15
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22.18
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22.26
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22.57
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21.36
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21.17
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TB
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21.40
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21.40
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21.25
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21.22
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21.27
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21.36
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21.30
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EAVE
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EAVE
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EAVE
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COVER
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GRASS
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GRASS
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GRASS
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LONG GRASS/REEDS
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LONG GRASS/REEDS
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LONG GRASS/REEDS
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CHERRYHOLT ROAD
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CHERRYHOLT ROAD
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0m
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10
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20
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30
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40
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SCALE BAR
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NOTES: 1. This drawing is to be read in This drawing is to be read in conjunction with all other Architect's, Engineer's and Specialist's drawings, specifications and documentation as part of the design package of information. 2. All pedestrian access routes to All pedestrian access routes to buildings are to be constructed in accordance with the Building Regulations Approved Document M : 2015. 3. All existing manhole/gully covers All existing manhole/gully covers are to be regulated to suit final site levels. 4. The Contractor is to ensure all The Contractor is to ensure all live utility services affected by the works are suitably protected/ diverted/ stopped up as necessary to facilitate safe construction activities.
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Lower level carriageway, constructed at existing ground levels (Floods at 1 in 20-yr event)
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Upper level carriageway, constructed on embankment above 1 in 1000-yr flood level.
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Public open space. Operates as Flood Plain Compensation for greater than 1 in 100-yr event. Finished ground level to be 21.05m AOD. Banks to be 21.35m AOD
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3-no Pairs of 600x600 Box Culverts allow flood water to progress through the road embankment
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Public Open Space. Direct Flood Plain Compensation Area for Strom Events up to 1 in 100-yr Event to be reduced to 21.050m AOD
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Public Open Space. Direct Flood Plain Compensation as part of works required for Storm Events up to 1 in 100-yr + 20% Event (Equivalent to 1 in 200-yr event. Area to be reduced to 21.250m AOD
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Car-parking area to provide additional Direct Flood Plain Compensation for events exceeding 1 in 100-yr likelihood. FGL to be 21.35m AOD 1:100yr+20% Flood depth = 140mm 1:100yr+40% Flood depth = 290mm (Equivalent to 1 in 750-yr event)
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Grade-Separated Road. One carriageway provides access to the development under all flood conditions
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Culverts through embankment allow flood water to progress
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1 in 100-yr event flood water will enter over the rim of the lagoon
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Houses constructed with floor levels at least 300mm above the 1 in 100-yr + 40% flood level
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Extreme Flood events will spill from the Lagoon to flood adjacent car-parking areas
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Ground level reduced to provide Direct Flood Plain Compensation
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Existing Ground Level
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Lagoon shall drain through dedicated system, including a non-return flap valve to prevent flows entering the Lagoon prematurely
