Beach Replenishment

McCallum Bros Ltd is the leading supplier of beach replenishment sand to beach restoration projects in the Auckland region.

Changes in the coastal structures and prevailing weather conditions have lead to the depletion of sand from many popular beaches. Often, increased stormwater runoff from urbanised suburbs has resulted in the original sand being washed offshore and thus lost to the beach.

The replenishment projects have involved the establishment of artificial concrete reefs (groynes) along the beach to restrict sand movement during storm events and the diversion of stormwater outlets to the extreme ends where the discharge will not wash the sand offshore.

McCallum Bros Ltd D50 Beach Replenishment Sand is taken from deep water deposits at Pakiri and is then transferred to the affected beach via sea (from barge and excavator or pumping barge) or via road (by truck and trailer) .

Delivery by Barge & Excavator
Where the beach profle is steep enough to allow close access by a barge replenishment sand can be delivered by offloading directly onto the beach by excavator. The replenishment sand is then distributed evenly along the beach by excavator. McCallum Bros Ltd delivered 4,200m³ of beach replenishment sand to Torpedo Bay in from June to July 2009.

Torpedo Bay before replenishment began

Sand being unloaded from the barge by excavator at high tide

The beach after being replenished

Delivery by Pumping Barge
Delivery by pumping barge can be arranged for large volume deliveries to beaches which are not suited to direct access by barge and for which there is unsuitable road access or road delivery would cause unacceptable disruption to other road users. St Heliers Beach was replenished by pumping 30,000m³ from offshore barges from May to October 2006.

Aerial view of sand replenishment in progress at St Heliers (via Google Earth), in July 2006. The vessel Coastal Carrier is anchored in the bay beside Kaipara Ltd.'s pumping barge (top centre of picture). The sand pumped ashore to date can be seen near the left of the photograph (around 25% of the final volume).	The beach as it was before replenishment. Increased urbanised stormwater runoff was primarily responsible for the diminishing volume of sand on the beach.

Kaipara Ltd. used an excavator to distribute the sand evenly along the beach after it had been pumped ashore from the barge.	Restoration of St Helier's beach was completed in October 2006, many months ahead of schedule. 30,000m³ was placed on the beach from a deep-water source 2 km offshore in the Pakiri Embayment.

St Helier's beach July 2006	St Helier's beach July 2008

St Helier's beach July 2006	St Helier's beach July 2008

Delivery by Truck
Where access by road is straightforward and impact on normal traffic flows are minimal we are able to deliver sand by truck. If direct access for the trucks onto the beach is not possible delivery may be made to a suitable nearby location. The sand is then transferred to the beach by loader, then distributed along the beach by loader, digger and/or bulldozer. McCallum Bros Ltd truck & trailer units delivered 3,760m³ by to Judges Bay for Auckland City Council over 6 days in November 2010

Judges Bay before replenishment began July 2010

Removing sediment from the bay

Delivering sand to the top of the beach

Redistributing the sand along the beach

Beach replenishment projects:
Beachaven
Dates	Volume	Method	Associate
June 2004	500m³	Barge & Excavator
June 2005	500m³

St Heliers
Dates	Volume	Method	Associate
May - October 2006	30,000m³	Pump onshore	Kaipara Ltd
Before		After

Mission Bay
Dates	Volume	Method	Associate
1994	45,000m³	Truck	Kaipara Ltd
February 2007	1,800m³

Manuka Road, Glenfield
Dates	Volume	Method	Associate
July 2005 & February 2007	200m³	Truck and Trailer
Before		After

Maraetai
Dates	Volume	Method	Associate
December 2007	800m³	Truck & Trailer	Hopper Construction

Bucklands Beach
Dates	Volume	Method	Associate
February 2008	191m³	Truck & Trailer	Downer EDI

Herne Bay
Dates	Volume	Method	Associate
June/July 2008	1,835m³	Small barge & excavator	Kaipara Ltd
Before		After

Sentinal Beach
Dates	Volume	Method	Associate
June/July 2008	944m³	Small barge & excavator	Kaipara Ltd
Before		After

Hamilton Rd Beach
Dates	Volume	Method	Associate
June 2008	825m³	Small barge & excavator	Kaipara Ltd
Before		After

Taylor's Bay (Manukau Harbour)
Dates	Volume	Method	Associate
June & July 2008	1,124m³	Truck & Trailer	Kaipara Ltd

Blockhouse Bay
Dates	Volume	Method	Associate
June & July 2008	936m³	Truck & Trailer	Kaipara Ltd

Pt Chevalier
Dates	Volume	Method	Associate
Sept - Nov 2008	16,000m³	Pump	Kaipara Ltd
Before		After

Torpedo Bay, Devonport
Dates	Volume	Method	Associate
June - July 2009	4,200m³	Barge & Excavator	Kaipara Ltd
Before		After

Judges Bay
Dates	Volume	Method	Associate
7 - 13 Nov 2010	3,760m³	Truck & Digger	Smith & Davies
Before		After