Message Board - Natural Turf: Drainage
8 Mar 2010 by Vic Demain
Anybody know what distance drains should be apart on a rugby field, taking one game and two training sessions per week please? It is a clay based pitch not sand construction and currently has 10 metre centres.
Vic.
8 Mar 2010 by Eddy21 Last edited 8 Mar 2010
Vic
You could always try this:
Hooghoudt's drainage equation .
Q L2 = 8 Kb d (Di - Dd) (Dd - Dw) + 4 Ka (Dd - Dw)2
where:
* Q = steady state drainage discharge rate (m/day)
* Ka = hydraulic conductivity of the soil above drain level (m/day)
* Kb = hydraulic conductivity of the soil below drain level (m/day)
* Di = depth of the impermeable layer below drain level (m)
* Dd = depth of the drains (m)
* Dw = steady state depth of the watertable midway between the drains (m)
* L = spacing between the drains (m)
* d = equivalent depth, a function of L, (Di-Dd), and r
* r = drain radius (m)
Or then again you could just hope that someone like Barry Pace answers this question.
DE
Learning is there for every man
8 Mar 2010 by Vic Demain
Hi Dave,
Don't know where you got that one from but I've got as much chance of understanding that as I have of getting one of your wild boar on the ground.
Cheers.
Vic.
8 Mar 2010 by Aintgottaclue!!
Vic Im on sand I our drainage is at 5 metre centres mate an the amount of rain you get you need at least that i guess.
Could I borrow your germination sheets again soon please my junior square looks really good after rugby and football across it this winter..............not
I may cut grass, but i'm not green !!
8 Mar 2010 by Barry Pace
Hooghoudt's Equation...... makes my head hurt, Kevin is the true drainage expert, me I am just a doer... lol
But basically the equation, and its variations for slopes or water table effects allows a Designer to take all parameters into account to ensure that the optimum spacing and depth of pipe is installed to an individual site.
The diagram attached shows the relevant elements and should make it appear a little clearer......
Any more info and you all would be drainage experts... got to keep some mystery to it.....
Vic, I really couldnt say here if 10m is enough or not without knowing what is expected of it, soil type, etc etc etc. hopefully something else to discuss on Wednesday....
Will reply to that one reference a convenient time.
Plastic.... it's The End I tell you... THE END!!!!
9 Mar 2010 by Vic Demain
Tony, long time. I guess 11 games played in 2 seasons answers the question. This a 2 year old purpose built facility leased from the council.
Come and get the sheets whenever.
Barry look forward to your thoughts.
9 Mar 2010 by Ed Gilbert
I would suggest that on a clay soil that 5 metre centres for lateral drains would be a better bet. If you are struggling with the 10 metre spacings that you already have, you could try installing some secondary drainage over the top of these to improve things.
9 Mar 2010 by Barry Pace
Gents, there are so many variables, budgets, it may have needed 5 but 10 was all the pot would allow, was a secondary system intended to be installed over, did this happen.
Sportsturf drainage is evolving too, some of the more forward thinking are starting to move away from the 5-10m pipework and 1-2m sand banding to a more intensive 3-6m pipework and sandmastering, whole lot less hassle with establishing grass over the bands..
Plastic.... it's The End I tell you... THE END!!!!
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