they proposed five strategies forest protection reforestation agricultural bestmanagement practices riparian restoration and forestfuel reduction each of which would be adapted to local circumstances they found that increasing the rate of adoption of bestmanagement practices on of watershed agricultural areas from which water is sourced in the largest cities would result in a sediment reduction in the water supply constituting the most costeffective option as shown in figure the same option is less costeffective than others when it comes to nutrient reduction also figure