[Cycling] Dirt for building DJ's

[waiwai]

what type of dirt would be best for building DJ's?, i've got easy access to i either clay, rubbleand just normal dirt but i think that if i build them out of clay when it rains it will ruin the jumps,but if i build it out of rubble when i stack it ill really hurt

can anyone help ?

thanks

 

[alca]

for the base use piles of rubble then use clay on the top layer. the rubble wont wash away but you can still shape it because of the clay