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Crag & Route Beta

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Topic Date User

weather at Araps 12-Jan-2011 At 9:39:11 PM lacto

Message

On 12/01/2011 widewetandslippery wrote:
>Wendy I think it was in the evanb vs tonyb pissing match you talked about
>how bad laser leveling of paddocks was for the river. How does level paddocks
>effect runnoff in flood. Just interested. I was last at Nati lake less
>than a year ago and it was a cricket pitch. Do you know if a water source
>is wet or dry as concrete whether that effects the flooding process?
Lasering is puting a constant grade across a paddock to assist efficent irrigating and drainage . Seldom does anybody remove soil (volume ) just grade it to 1 in 1500 or 1 in 300 etc Very unlikely to effect flows in most areas and highly unlikely to have been done in the Natimuk area . Soils absorb water at different rates into its profile and when the whole profile is saturated will flow off .when the profile is very dry as in summer big cracks appear and upto 200 mm is needed to irrigate Ist time versus 40 to 50 mm for subsequent waterings Most areas in victoria have wet soils fully water storages and rain will translate into runoff rather than go into the profile