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天荒坪工程上游输水系统为斜井，一洞三机，输水道总长与平均发电水头的比值为２．５。６台机组有两个相同的水力单元，中心距为５９．５４ｍ，承受６８０ｍ的最大静水头，输水系统全长１４３５ｍ。尾水部分长２４５．３～２５３．８ｍ，为单机单洞，共６条尾水洞。岔管采用钢筋混凝土结构，平底两次分岔，分岔角度为６０°。高压钢管承受最大内压为８．７ＭＰａ，近厂房段钢管按明管设计，离厂房边线１８ｍ外按埋管设计并考虑钢管、衬砌和围岩三者联合作用。为保证钢衬回填质量，高压钢管均不设加劲环，在回填混凝土和回填浆液中掺适量微膨胀剂，并采用设置排水廊道和钢管外排水等措施降低外水压力。经充水试验观察，高压钢管部位缝隙值小于设计值，外水压力接近零，效果较好。
The water system of Tianhuangping upstream of the project is inclined shaft with three holes in one hole. The ratio of the total length of waterway to the average generating head is 2.5.6. The unit has two identical hydraulic units with a center distance of 59.54m. 680m of the largest static head, water delivery system length of 1435m. Tailrace part of 245.3 ~ 253.8m long, as a single hole, a total of 6 tail hole. The bifurcated pipe adopts the reinforced concrete structure, bifurcated twice at flat bottom, and the bifurcation angle is 60 °. High pressure steel pipe to withstand the maximum internal pressure of 8.7MPa, near the plant section of the pipe according to the Ming tube design, 18m away from the factory side by pipe design and consider the pipe, lining and surrounding rock three combined effect. In order to ensure the quality of steel liner backfill, no high-pressure steel pipe stiffener ring, in the backfill of concrete and backfill slurry with appropriate amount of micro-expansion agent, and set the drainage corridor and steel pipe drainage and other measures to reduce external pressure. The water-filled test observation, high-pressure steel pipe part of the gap value is less than the design value, external water pressure close to zero, the effect is better.