Online text resources.
What is hydraulic engineering?
https://conceptodefinicion.de/ingenieria-hidraulica/
Texts on how sewage works.
https://www.cubaseltiopaco.com/para-que-sirve-la-red-de-alcantarillado-y-su-limpie/
https://es.wikipedia.org/wiki/Alcantarillado
Texts about garbage in the sewer.
http://wradio.com.mx/emisora/2018/09/12/guadalajara/1536706629_280899.html
https://www.notisistema.com/noticias/alcantarillas-con-basura-causa-principal-de-inundaciones-en-zapopan/
http://wradio.com.mx/emisora/2019/05/31/guadalajara/1559258049_457000.html
Texts on measurement and amount of rainfall
https://instrumentosdemedicion.org/medir/la-lluvia-que-cae/
https://water.usgs.gov/gotita/earthrain.html
Inventions for floods
https://www.eldefinido.cl/actualidad/lideres/3073/Nino_de_11_anos_invento_la_gran_solucion_para_las_inundaciones/
https://news.culturacolectiva.com/noticias/inventos-contra-lluvias-ciudad-de-mexico/
http://www.cienciamx.com/index.php/tecnologia/biotecnologia/15906-tecnologias-bajo-impacto-inundaciones-lluvias