WITH seasonal conditions leading to a shortage of stock water across north-west Victoria – and most of the state – there has been renewed interest in constructing farm dams, and the addition of pumps, bores, tanks, troughs and piping.
However, Agriculture Victoria land management extension officer Clem Sturmfels is advising breeders to “ask some important questions” before starting on new dams or adding water infrastructure or equipment to their property.
Mr Sturmfels said before engaging an earthmoving contractor, people must investigate answers to important questions, such as:
• How much water do I need?
• Will the dam hold water?
• Will it fill most years?
• How big should it be and what will it cost?
• Is there a good site for a spillway?
• Do I need a permit or licence?
“Longer, hotter summers and decreased cool-season rainfall has meant many smaller dams built in previous years are drying up,” Mr Sturmfels said.
“Lack of runoff, increased water consumption and evaporation also contribute to this issue.
“Many new dams are also failing within the first few years due to inappropriate materials or poor construction techniques.
“As a result, farmers need a bigger catchment area to improve the chances of filling dams regularly.”
Mr Sturmfels said at least 10ha of catchment for every megalitre of water stored in a dam is recommended, and runoff from nearby roads and tracks is an effective way of getting water, especially in a dry year.
He said a livestock dam should be as deep as your site will allow, with a minimal surface area to reduce evaporation.
Consideration should also be given to planning a key large dam to use for reticulating water to troughs across the property, by gravity or pumps.
A permit or licence may be required to build, extend or repair a farm dam in Victoria. Contact your local rural water authority for details.
