Half-round gutters
Gutter system used brings all stormwater to one end making subsurface works very minor.
Webbed rafters
Efficient use of steel as opposed to traditional beams.
Translucent sheeting
This lets natural light in to make the space useable in all weather.
Netting to divide space internally
Netting is hung from rafters which means space can be divided up when various sports are being played.