FARM DAM DESIGN REPORT

2020 ENGINEERING SOLUTIONS

2020Engineering Solutions 1745 Colac — Forrest Rd Colac. Vic. 3249 Mob 0428 14 14 41 Office (03)5233 4608 ABN 57 215 499 312ACN 11 9460 865 info@2020es

SITE:

FARM DAM DESIGN REPORT

420 YEO-YEODENE RD. YEODENE VICTORIA

DEVELOPER: Messrs. A. & C. McDonald

REPORT NUMBER: E518103.2 DATE: 10/07/2018

D20/128919

REPORT ES18103.2 2020 ENGINEERING SOLUTIONS ACN 11 9460 865

1.114 *

olo

REPORT SUMMARY

This report details the proposed construction o f a farm dam on the subject land.The design consists o f a curved 'hillside type o f construction retaining4.9MI o f water wi th 1500 m3 of earthworks.

DEVELOPER

A & C Mc Donald

ADDRESS

420 Yeo-Yeodene Rd. Yeodene, Victoria.

TITLE

Lot 2 PS 614498

SITE

'0•Jei

- " I l i ' .1*

. i0 , , ,7 , , ,

, , , , ,L, . " -

r ..." •

. „ . 4 '

* . • # " f i f i l e . : . ' ' t i a l l A i i i i i i i " r ' • . 4 , . '

. ' • S • - ,

• , #1.-Ar 'Nap&

•....' e ' s . : ,

9 * • t i YECI-YEti

* * .

I! , • A , 4 * 4, Q.ReoPocL 4

* , • • ' t. '.. ' ' - 4'41,,,iO4

O 14 10 $ i r , t

419 ke-4-in f ! * . i . . • 1'

, 0 4 4 - 4 ,—, , , . " , . ; \ • 9,„ ,, . 7p. • '"," 1,11CcAC 0..-7‘7,/i' : '40,4401,4%. ' r V ' '131-113w. 1, , 0 4.:. .311.' 4W.rt'l

* i i i s l $ 1 ' ' I* • I 4 'I° I A *

4, ,',,g, ow,. ,7- •, _ *e- *- 4 , . 4_

r € 4 4 ''' i • 1 '

W ' . 4 . 4 : . ; ; ' .

-.:.•

9.4t

Proposed dam site (Planning Maps Online)

GPS LOCATION; S 38° 2.683 E 143°14.342Elv 218m

•

•

www.2020es.com of 8 www.2020es.com

D20/128919


Proposed dam site (Planning Maps Online)

ZONING

FZ

OVERLAYS

EM01 ES03 SLO1 VP01

VEGETATION (See cover photo)

At the time of inspection the proposed site comprised open, mostly cleared, farmland.

SOIL

From a drill hole excavated into the proposed foot print, the sub-surface profile comprised asilty sand over a deepsandy clay, typical for the area and well suited for construction of the proposed dam.

CATCHMENT

Proposed dam is in the catchment of Barongarook Creek and is to be constructed 'off-stream'.


D20/128919

REPORT E 20 NGINEERING SOLUTIONS ACN 11 0 865

DESIGN CONSIDERATIONS

The brief was to design a farm dam to be used to supply water to livestock grazing on adjoining land and small scale irrigation supply.

From the auto calculator in Planning Maps Online the subject dam will have a natural catchment area of about 13Ha.This can be expected to yield around 5.8 MI/pa. (Lewis,B.).

As indicated in the foregoing topography map, the site displays a moderate NE aspect dipping down at about 6.00 with a convergent shape.

Due to the shape and slope of the ground, a semi-circular wall has been designed to efficiently use available soil, calculated as 1600m3 to be extracted from the borrow pit, retaining 4.9MI.

At 4.9MI the dam would support, year round, about 50 head of cattle and supplement farm irrigation supply while the dam would provide a buffer against low flow seasons and an environmental reserve.

Up stream wall slope is to be 1:3, which is the conventional design, however the down stream wall is also 1:3 which is flatter than traditional and provides a safer working surface for post construction activities, but does consume additional soil in the construction.,

SPECIAL GROUND TREATMENT ZONE

The drilling investigation revealed a zone of silty sand under the top soil, this material displays very low strength when saturated.

To prevent this material flowing into the dam, leading to degradation of the water quality and damage to the dam edge, the following procedure should be undertaken.

1. Strip topsoil from zone about 5m above water line 2. Strip pale yellow silty sand from same area down to clay 3. Place and compact topsoil into area previously occupied by silty sand.

This procedure is to prevent the underlying silty sand from flowing into dam.

vuvuvu 2 0 2 0 es,com 4 ,2020es,com

D20/128919


L _1

Existing conditions

www.2020es.com o f 8 www.2020es.com

D20/128919


Proposed design. (PDF and CAD files available upon request)

www.2020es.com o f 8 www.2020es.com

D20/128919

REPORT E 20 NGINEERING SOLUTIONS ACN 11 0 865

REPORT LIMITATION

The recommendations made in this report are based upon the assumption that the 'as tested' conditions are consistent across the site. This is often not the case; the client would be advised to contact the author at the footing excavation stage to confirm test results.

This report is based in part upon information provided by the client. 2020Engineering Solutions takes no responsibility for errors or omissions contained in sourced material.

This report should be read in entirety and not selectively reproduced.

Contractors to confirm all levels and volumes.

It is recommended that the report number be referenced for any future discussions, failure to supply the report number may result in lengthy delays.

Michael Delahunty BEng MIEAust

vuvuvu 2 0 2 0 es,com 7 ,2020es,com

D20/128919

REPORT E518103.2 2020 ENGINEERING SOLUTIONS ACN 11 9460 865

Repo r t Limitations

2020 Engineering Solutions Pty Ltd ("2020") Geotechnical Report Limitations

The report to which this document has been attached assesses risks arising from land slope instability and proposes risk minimisation solutions. Absolute risk avoidance cannot be assured, principally due to assessment cost factors. It is therefore necessary to rely on instructions and make assumptions.

Changed Conditions

The report may be invalidated by changed conditions including:-

1. topography.

2. soil moisture content.

3. above or below ground structures.

4. soil and substrate profiles.

5. location of site boundaries.

Causes of Changed Conditions

Changed conditions may occur due to:-

1. extreme conditions such as flood, drought, cold, heat or fire.

2. human activities.

3. natural processes.

4. planning or design requirements.

Client to inform 2020 of any changes

2020 will endeavour to identify any reasonably foreseeable risk factors on the site which may cause changed conditions. Samples are taken at reasonable intervals bearing in mind the cost to the client. In the absence of specific instructions or patent conditions it will be assumed that conditions observed in samples are consistent across the site.

This document is provided to inform the client that their responsibility for risk is shared with 2020. The client will be responsible for inaccurate instructions or failure to instruct in relation to changed conditions, events that may cause changed conditions or when it becomes evident that assumptions may be invalid. Failure to do so could result in substantial and costly damage and disputes.

Interpretation

The report must be considered in its entirety. Each part of the report may be dependent on other parts for meaningful interpretation. The report should also only be used by the client. It may not be relied upon by any other person without first conferring with 2020. The report should only be acted upon and interpreted by persons qualified and competent in the activities contemplated in the report

130433 -130531 Geotechnical Report Limitation


D20/128919

FARM DAM DESIGN REPORT

Documents

Transcript of FARM DAM DESIGN REPORT