全省引水干支渠共有5,900余条,13,000余公里。但有不少渠道渗漏比较严重,成为灌区不能充分发挥效益的主要原因之一。从吉林省地区的实测资料看,渠系有效利用系数普遍较低,一般为0.5或以下。沿松花江两岸更小,仅在0.2～0.3左右。影响渠系水利用系数的因素故然很多,但主要是渗漏损失。一般老灌区渗漏损失约占总损失量 There are more than 5,900 dry-water diversion channels and over 13,000 km of waterways in the province. However, there are many channels that cause serious leakage and become one of the main reasons why irrigated areas can not bring their benefits into full play. According to the measured data from Jilin Province, the effective utilization coefficient of canal system is generally low, generally 0.5 or below. Along the Songhua River is smaller, only about 0.2 to 0.3. There are a lot of factors that affect the coefficient of water utilization of canal system, but mainly the loss of seepage. Leakage loss in general irrigated area accounts for the total loss