NADARZYN, Poland Client: Local Administration of Nadarzyn Country: Poland Length of Pipe: 16km No. of Valves: 244 Volume of Flow: 20 litres/second Specialist Feature: Widely scattered building in narrow streets. Difficult terrain with high water table. Nadarzyn is a town situated approximately 30 km south of the capital city of Poland, Warsaw. The town and the surrounding area is flat with Nadarzyn itself being sparsely populated with houses and local amenities widely spread. The water table is only approximately 1m below the ex- isting ground level and trial holes found the soil condi- tions to be very poor. With these challenging ground conditions and the cost implications associated with in- stalling a conventional gravity system it became appar- ent that an

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