2. Huntly Flood Alleviation Scheme
Presentation for tonight:
Brief re-cap of previous findings
What we have done since last meeting
The next steps
Interim emergency arrangements

3. Huntly Flood Alleviation Scheme
Initial study by Halcrow Group concluded
1:100 year flood event in 2009
Flooding caused by overtopping of River Deveron banks at Milton
Excess water diverted to Meadow Burn
Capacity of Meadow Burn embankments and 4 culverts unable to cope
Aberdeenshire Council approved development of scheme in principle in May 2010
and instructed investigation of funding options

4. Huntly Flood Alleviation Scheme
What we have done since last meeting:
Appointed Atkins to take scheme forward
Examined Halcrows recommendations in more detail
Reviewed and refined flood modelling- discussed and agreed methodology and results with SEPA
Now believe 2009 storm return period significantly less than 1:100 year event
Examined effects of different flood return periods
Confirmed more frequent smaller scale flooding could result from overland flows from Ittingstone Burn exceeding capacity of structures in Meadows
Saw that in December- culverts under all-weather pitch backed up

5. Huntly Flood Alleviation Scheme
What we have done since last meeting:
Undertaken geomorphological study to ensure that any adverse impacts on WFD status of river will be avoided
Geomorphology is the study of landforms and processes that shape them- here, the effects of river sediment movement
Status is a measure of ecological/environmental quality of river
Resulted in preference to set back river defences to avoid bank erosion
Undertaken preliminary site investigation to determine nature and permeability of underlying ground and quality of existing embankment materials
Examined different technical solutions

6. Huntly Flood Alleviation Scheme
What we have done since last meeting:
Undertaken preliminary consultations, identified and considered environmental constraints
Key ones being badger sett and historic Huntly Castle
Established utility service locations
Arrived at modified preferred solution
Checked proposals against requirements of the Reservoirs Act
This considers the dam effect of impounding water above a certain volume

7. Huntly Flood Alleviation Scheme
What we have done since last meeting:
Completed an economic appraisal or cost benefit analysis
For justification must demonstrate that value of damages prevented is more than the cost of the scheme
In this case ratio of benefit:cost is 1.1
Held initial discussions with landowners
Secured approval from Policy and Resources Committee on 21 April to implement scheme
Preliminary cost of scheme £2.9m
Timescale- April 2012 at very earliest
So what does scheme now entail?

8. Huntly Flood Alleviation Scheme
Revised proposals
Reposition bund at Milton away from water edge
Easier to construct but greater impact on farm land
Construct low bund to east of Gibston Bridge
Heighten/strengthen bunds along north & west sides of Meadow Estate
Extend bund across Meadow Burn at entrance to estate and regulate flow to capacity of culverts downstream
Will result in water being stored in field immediately upstream
Construct low bunds to prevent backflows into caravan site
Replace small culvert with footbridge
Install enlarged/extended culvert with flap valve and low bunding at Ittingstone

9. Huntly Flood Alleviation Scheme
The Next Steps
Develop design to detailed stage
Undertake formal consultations
Obtain Statutory approvals including Planning permission or Flood Order
Obtain CAR licence if necessary
Commence land negotiations
Could result in CPO if agreements or compromises not possible
Prepare contract documentation/invite tenders
Continue discussions regarding possible funding contributions
Grampian Housing Association & Transport Scotland
Construction start date will largely depend on level of objections and/or difficulties with land negotiations

10. Huntly Flood Alleviation Scheme
Interim emergency arrangements
Installation 2 pairs 10’x10’ storage containers
One to west Pine View
One close to junction Riverside Drive and Rowan Avenue
Planning permission required
Stocked with sandbags for self help
Responsible key holders to be identified
Grampian Housing have own arrangements
Onus remains on property owners to be prepared