Uring the past decade the water table has been lowered constantly with no sign of recovery. Villagers who have drawn water from their shallow wells, now, are suffering from shortage of pumping water. This project aims to study the top most sand layer potential for recharging rainfall to ground water through seepage system, in Phichit province. The tests for determining seepage coefficient of top soil layers have been carried out in the fields and in the department laboratary. The field test cover 4 subdistricts; namely, Noen Sawang, Dongsuea Lueang, Phai Rop, Phai Tha Pho in Pho Prathap Chang district. From field tests, the average seepage coefficient of 0.00002183 was used for the design of seepage pit to collect rainwater from roof with the area of 60 sq.m. The pit has diameter of 100 cm., and depth of 491 cm. Similarly, the laboratory test gave the average seepage coefficient of 0.002795. Basing on this coefficient the seepage pit collecting rainwater from a roof having same area was designed such as its diameter of 50 cm. and its depth of 194 cm. The study found that this seepage system, when equiped, can recharge rainfall as much as 82 cu.m. per household per year. Also, the actual seepage system has been constructed at Baan Noen Khwang School, in Noen Sawang subdistrict, The automatic rain gauge and automatic groundwater level measuring device were equiped to the system to register important data for any future research.
By
Chaichawathana Kannasutra
Therawathana Jitprapantha
Sudto Thongwan
Amornchai Jantorn
