▁all ▁major ▁factors ▁in ▁determ ining ▁the ▁er os ivity ▁of ▁ra inf all . ▁Sed iments ▁containing ▁more ▁cl ay ▁tend ▁to ▁be ▁more ▁resist ant ▁to ▁er os ion ▁than ▁those ▁with ▁sand ▁or ▁s ilt , ▁because ▁the ▁cl ay ▁helps ▁bind ▁soil ▁particles ▁together . ▁So il ▁containing ▁high ▁levels ▁of ▁organ ic ▁materials ▁are ▁often ▁more ▁resist ant ▁to ▁er os ion , ▁because ▁the ▁organ ic ▁materials ▁co ag ulate ▁soil ▁col lo ids ▁and ▁create ▁a ▁stronger , ▁more ▁stable ▁soil ▁structure . ▁The ▁amount ▁of ▁water ▁present ▁in ▁the ▁soil ▁before ▁the ▁precip itation ▁also ▁plays ▁an ▁important ▁role , ▁because ▁it ▁sets ▁limits ▁on ▁the ▁amount ▁of ▁water ▁that ▁can ▁be ▁absor bed ▁by ▁the ▁soil ▁( and ▁hence ▁prevent ed ▁from ▁flow ing ▁on ▁the ▁surface ▁as ▁er os ive ▁run off ). ▁W et , ▁s atur ated ▁so ils ▁will ▁not ▁be ▁able ▁to ▁abs orb ▁as ▁much ▁rain ▁water , ▁leading ▁to ▁higher ▁levels ▁of ▁surface ▁run off ▁and ▁thus ▁higher ▁er os ivity ▁for ▁a ▁given ▁volume ▁of ▁ra inf all . ▁So il ▁comp action ▁also ▁affect s ▁the ▁per me ability ▁of ▁the ▁soil ▁to ▁water , ▁and ▁hence ▁the ▁amount ▁of ▁water ▁that ▁flows ▁away ▁as ▁run off . ▁More ▁compact ed ▁so ils ▁will ▁have ▁a ▁larger ▁amount ▁of ▁surface ▁run off ▁than ▁less ▁compact ed ▁so ils . ▁ ▁Veg et ative ▁cover ▁ ▁Veg et ation ▁acts ▁as ▁an ▁interface ▁between ▁the ▁atmosphere