HydrologyRainfall/runoff and hydraulic modeling is the building block for many water systems. ERC has gained its substantial hydrological expertise through studies of drainage networks, irrigation and flow conveyance structures, stormwater systems, river catchments and reservoirs. Our experience includes work in a variety of climates ranging from permafrost regions of northern Alaska to coastal areas in the Philippines to high alpine work in Peru. Hydraulic modeling and design includes conveyance structures, spillways, dam break analysis, culverts, gates and reservoirs.