These structures have been installed and operated for a number of reasons: 1  locks allow navigation on large rivers to facilitate boating traffic. 2  weirs create pool environments for diversion into irrigation channels, for pump intakes, recreational boating and swimming, and other aesthetic reasons.
Medical Definition of carbohydrate. : any of various neutral compounds of carbon, hydrogen, and oxygen (as sugars, starches, and celluloses) most of which are formed by green plants and which constitute a major class of animal foods.
A carbohydrate is an organic compound made of carbon, hydrogen and oxygen, and âcarbsâ typically refers to food rich in starch or sugar. Carbs always contain calories (4 per gram), but calories do not necessarily indicate carbs. 1 Foods Rich in Calories vs. Carbs.