Environmental Engineering Reference
In-Depth Information
Identify design
objectives
Consultation with
conservation bodies
Identification of
design constraints
Select suitable
design options
Appropriate
legislation
Determine site
characteristics and
target species
Discuss options
and agree preferred
choice
Consultation with
interested parties
Preliminary Design
Hydraulic and
morphological
design
Ecological design
Numerical modelling
(if required)
Consultation with
interested parties
to
agree desi
gn
Have
requirements
been met ?
NO
NO
YES
Detailed Desig
n
Short and long term
evolution
Consultation
Fieldwork
(may need to
be done earlier
to support
Preliminary
Design)
Environmental
Assessment
Construction and
monitoring
Risk Assessment
Fig. 4.1
Design flow chart for managed realignment.
.
hydrodynamic, hydrological and morphological
characteristics;
.
habitat and species characteristics
as outlined in Table 4.3 [see ABP Research (1997)
for further elaboration; available at www.estuary
-guide.net].
The process of designing a scheme, based on all
the above considerations, is most effectively be-
gun with a walk-over of the site and an interro-
gation of the topographic maps of the site (e.g.
using LiDAR survey data). Topographicmaps can
be used to identify features such relic creeks in
historically reclaimed land and these can be the
best guide to designing a scheme because they
betray the natural morphology and thus indicate
the best approach to achieving habitat restora-
tion. Carrying out a site visit with this topograph-
ic data, both at high and low water, is also
valuable for reviewing sea wall integrity, identi-
fying breach locations (e.g. ideally at eroding
locations/promontories and positions where
sluices already exist), and assessing patterns of
erosion and accretion in the adjacent estuary/
coast to identify whether the site needs to be
realigned in discrete and hydrodynamically sep-
arate phases.
