Nalalkayaga ayaa muujinaya nidaam heerar firfircoon oo firfircoon oo lagu habeeyo isbeddelada culeyska gaariga iyo wacitaanka wadada, hubinta isgoyska saxda ah. Tani kaliya ma fiicna badbaadada, laakiin sidoo kale waxay xaqiijineysaa nal joogto ah oo diiradda saaraya si loo wanaajiyo raaxada xaalada xaalad kasta oo wadis ah. Nalalkayaga isku-dhafka ah ee hordhaca ah ayaa bixiya shaqooyin kala duwan oo ay ku jiraan dogob hooseeya, jaranjarada sare, calaamadaha leexashada, nalalka socodka maalinlaha ah iyo nalalka booska.