Camperdown Game estate for rob Kirby

In response to a request from Rob Kirby

we submit the following prospective and

innovation document for the game estate

developments proposed by the developer.

We understand that KV3 may already have

completed some work on the initial project

stage. In respect to KV3 we request that their

work be reimbursed (if a different engineer

is employed) or that they are kept on the

professional team. This recommendation is

made, by us, in line with our core value of

respect.

We enjoy a good working relationship with

Rob Kirby so offer this document, freely, as a

building step for your projects.

Dominic Collett

26 May 2010

Regency House,3 Douglas Crowe Dr

Ballito Business ParkBallito, 4420

Tel: +27 (0) 32 9463848Fax: +27 (0) 32 5860007

Tel (Direct): +27 (0) 82 3206256Mobile: +27 (0) 82 3206256Email: dominicc@ssi.co.za

www.ssi-dhv.com

PO Box 6340Zimbali, 4418South Africa

ExEcutivE SuMMARy

RESPECT, INNOVATION AND FREEDOM

Providing a world class estate is a team effort. From the

planning and design of the living environment, opportunities

exist to build relationships, to empower communities and to

create a better quality of life.

The spark that transforms a project into a winning project is

INNOVATION. The ability to look at a problem and to see

opportunities is what is needed now more than ever before.

SSI Engineers and Environmental Consultants has established

a culture of innovation, which has been of real benefit to

“whole life thinking”.

All this is embodied in our core values of

RESPECT, INNOVATION AND FREEDOMRESPECT, INNOVATION AND FREEDOM

introduction

SSI have developed a specialised section

for the planning, design and construction

management of prestige residential

developments. This experience has been

obtained over many years and has focused

on the requirements of clients determined

to provide to their customers where the

engineering is of the highest quality.

Inherent in this process is sensitivity to

the environment and the development of

a low maintenance infrastructure. This is

particularly important in the management

of stormwater, and SSI have developed

innovative ways in which the realities of

high rainfall in geotechnically sensitive

areas may be addressed without resorting

to hard engineering solutions, which may

detract from the visual appearance of the

development.

La Lucia Ridge, The Gardens, Ilala Ridge

and Kindlewood are all residential projects

in umhlanga. The sensitive Berea Red

and windblown cohesionless sands in

these areas required careful consideration.

In response to this, SSI developed a

stormwater master plan which provides

for underground stormwater attenuation

as site level through to attenuation in dams

in a conservation zone which controls the

stormwater outflow to pre-development

levels.

One of the more important aspects of

stormwater control is consideration of the

house construction phase, during which

the site is stripped of much of its natural

vegetation and the system is vulnerable

to increased runoff and erosion of the

valuable topsoils. The installation of the

underground attenuation system prior to

any construction, controls the runoff and

traps the eroded soil before it leaves the

site.

Where the development takes place

adjacent to wetlands, the attenuation

system is adapted by the addition of an

infiltration system to return the low flow

stormwater to the ground, recharging the

natural groundwater and further reducing

the site runoff.

Where the valley bottom becomes

overstressed as a result of the

development, additional measures need

to be taken to ensure that the stormwater

carrying capacity of the soil/ vegetation

interface is not exceeded.

In many instances the reaction to potential

erosion is to opt for a traditional engineering

solution. This can both be expensive

and an overlay conservative reaction.

There are interim measures which can

be implemented and SSI has been at

STORMWATER CONTROL A N D A T T E N U A T I O N

Geo Step - textile soil reinforcement

Concrete lip withY12 central reinforcement

200m

m

600mm

clay fill

Vetivergrass

1. roll out fabricand fill with clay

2 . cover withfabric and secureleading edge

Constructionprocess

Grass lined drain - no fall

The lowest step isextended to a2000mm length

Fencing standards at500mm intervals

GEO STEP | TEXTILE SOIL REINFORCEMENT

the forefront of the development of such

measures as GeoStep and GeoRoll soil

reinforcement, which are economical and

environmentally acceptable.

With the requirements of current legislation

imposing onerous requirements on

developers, it is necessary to address these

issues properly and competently. SSI has a

reputation for doing just that and we have

been professional team for many of the

most successful projects in recent years.

GeoRoll - Check Weir Construction

Water flow

Final ProfileOriginal Ground

GeoRoll to be constructedusing Geo Container fabric byKaytech. Generally 600mm in

height filled with localnon-erodable material

For additional protection, sprayexposed fabric surfaces with bitumen

emulsion (cover the bitumen withlocal sand while still tacky for a

natural appearance)

Fabric extended for a nominal 3 metre apronheld in place with dry packed handstone

0% grade to the top of the next GeoRoll

Grass lined drain

Grass lined drain

Geo Container fabric

Geo Container fabric

Bond the leading edge of the fabricusing "Dam Seal" bitumen emulsion

Tapered end of GeoRoll to bestitched and buried - Alternatively

"Dam Seal" may be used.Vetiver grass

GEO ROLL | CHECK WEIR CONSTRUCTION

road CONSTRuCTIONSSI have been in the forefront of concrete road

construction as a means of controlling stormwater

drainage and providing access. The use of concrete strips

on flatter terrain allows for a more aesthetically soft

approach as apposed to the use of conventional wide

premixed road construction. Gravel roads have its place

within an estate but needs to be carefully identified in

terms of functionality and appearance.

Concrete strip construction has limitations in terms of

application on steep grades where a more substantial

construction is required to combat soil erosion. The use of

concrete on steep grades allows for the stormwater runoff

to be controlled within the road surface and discharged at

low points and intervals along the drainage line.

The road geometry is critical to the successful control of

stormwater drainage. The use of pipes and kerbs can be

eliminated if the natural slope of the terrain is followed.

We have also had very good results using permeable

paving blocks. This construction offers the opportunity

to attenuate stormwater runoff to pre-development

flows by collecting the a volume of water within the road

layerworks structure. On a recent project this eliminated

all conventional stormwater drainage.

This system allows for the reloading of the aquifers and

offers a environmentally sensitive approach to hardened

areas.

ELECTRICITYSSI have completed a number of large scale solar panel and hot water installations. This technology can be designed to meet the estate’s requirements.

SANITATIONSSI have one of the largest Research and

Development budgets in the consulting

engineer field. This research and development

is mainly around Water and Waste Water

Treatment. We have patented a number of

processes. A sanitation solution is dependent

on a number of criteria that need to be

identified before proposing a specific solution.

Water reuse is our core sanitation approach

which has been successfully implemented

throughout the country in answer to our

limited water resource.

ConclusionEach project has unique features for consideration, and requires new specific innovation ideas.

We look forward in assisting your team on this exciting project.

acknowledgments Photos | Tony Smith Design and Productions | Estate Press Publications

Regency House,3 Douglas Crowe Dr

Ballito Business ParkBallito, 4420

Tel: +27 (0) 32 9463848www.ssi-dhv.com