TAble 4

1 January 2000

Table 4 Problems that exist with the ten small, high hazard dams surveyed in Tan Moc communeNote: * Based on a dam inspection checklist developed from Ministry of Environment, Lands and Parks - Water Management Branch, British Columbia (1998) “Inspection & maintenance of dams - dam safety guidelines” and Department of Sustainability and Environment, the Victoria Government (2007) “Your dam - your responsibility: a guide to managing the safety of farm dams”.

Dam No.	Height (m)	Storage capacity (ML)	Main problems associated with dam safety	Acceptable or Unacceptable*
1	4	600	Excessive vegetation on the upstream face, downstream face and crest of the dam; The crest is uneven; Upstream and downstream faces are substantially eroded; Spillway is concrete and in good condition.	Unacceptable
2	6	800	The top crest is damaged by traffic: dip on the crest; Slide on the upstream face; Excessive vegetation on the downstream face; Traffic damage and slide on the downstream; Spillway is in good condition.	Unacceptable
3	4	500	The top crest is damaged by traffic: dip on the crest; Slide on both the upstream and downstream faces of the dam; Spillway is in good condition; Excessive vegetation and trees.	Unacceptable
4	5	500	The top crest is damaged by traffic; Traffic damage on the downstream face; Slide on both the downstream and upstream faces; The crest is uneven; Two large holes on the top (serious); A lot of cracking on the top; Low area on the top; Spillway is appropriate.	Unacceptable
5	6	2500	Failed in 2008, about 20 houses flooded away; Cracking on the crest; Slide on both the upstream and downstream faces of the dam; Animal burrows; Spillway is in good condition.	Unacceptable
6	5	2000	Dams No. 5 and 6 caused a cumulative failure in 2008; Cracking; Excessive vegetation and trees on both downstream and upstream faces; Spillway is built of concrete and appropriate.	Unacceptable
7	5	600	Slide and cut on the top; Small and very old outlet; Cracking; Crest is uneven; There are a number of large trees; There is no spillway.	Unacceptable
8	2.5	350	The top is damaged by traffic; The crest is uneven, low areas on the top; Large hole on the crest; Slide; Small outlet and very small spillway (under-standard); Spillway is blocked by large trees.	Unacceptable
9	2	300	Failed in 2008 and repaired in 2009; Rice fields were damaged because of the failure in 2008; Slide; Cracking; The top is damaged by traffic.	Unacceptable
10	3	1000	The top is damaged by the traffic; Uneven crest and low areas on the top; Slide on the downstream; Excessive vegetation on both the downstream and upstream; Outlet is broken. Too old and cracking outlet; Spillway is too small; Spillway is blocked.	Unacceptable

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