(h) Mine Drainage and Dewatering System:
(i) The Contractor shall make, at its own costs, a dewater system to collect surface water away from the working area of the Employer's Facility including construction of the ditches, grading or profiling and keep it at all time in good condition. Any blockages to such dewater system shall be immediately removed by the Contractor.
(ii) The Contractor shall construct and maintain the controlled ditch with the cross section and gradient as approved by the Employer from the area of the Employer's Facility to the nearest collecting ditches or main sump provided by the Employer provided that the Contractor shall submit a drainage plan and construction procedures on 1 February of each year for approval. The Employer has the right to use any facilities proposed in the drainage plan of the Contractor.