Why GMC is so regressive when it comes to sewer maintenance?

Does anybody know why GMC (Guwahati Municipal Corporation) is so I'll equipped , regressive when it comes to sewer, drain cleaning? They especially during monsoon times take out the blackish soil + sludge amalgamation from drains & collect them in small mound like structures on the road along the drain & most of the times rain washes them back into drain & gets spilled on the road making walking on the road nothing short of nightmarish experience.