13.-1540. Subsurface irrigation.

13.- WASH Glossary.
13.-1539. Subsurface groundwater recharge.
13.-1538. Subsurface drainage.
13.-1537. Subsoil.
13.-1536. Subsidy.
13.-1535. Subsidence.
13.-1534. Subsidence, land subsidence.
13.-1533. Submersible pump.
13.-1532. Subgrade.
13.-1531. Struvite.
13.-1530. Struvite reactor.
13.-1529. Struvite precipitation.
13.-1528. Streamflow.
13.-1527. Stream.
13.-1526. Stream erosion.
13.-1525. Strategy.
13.-1524. Strategic finance planning - ( SFP ).
13.-1523. Strainer.
13.-1522. Stormwater.
13.-1521. Stormwater management.
13.-1520. Stormwater drainage.
13.-1519. Stormwater and reclaimed water reuse.
13.-1518. Storm sewer.
13.-1517. Stored urine.
13.-1516. Storage, stored volume, stock.
13.-1515. Storage coefficient - ( S ).
13.-1514. Stock solution - ( Mother solution ).
13.-1513. Sterilisation.
13.-1512. Sterile.
13.-1511. Stereographic imaging.