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In this paper, we present two prototypes for monitoring the presence of solids in wastewater and to study the effect of the water height. The prototypes are based on color and infrared LEDs and two photosensors located in the prototypes at 0\u00b0 and 180\u00b0 degrees. When the photosensor is located at 180\u00b0, all color LEDs present a good range of output voltage (approximately 5\u2009V to 0\u2009V) and good R2. However, for the typical concentration of solids in wastewater, the prototypes do not work correctly. When the photosensor is located in the prototypes the LEDs, yellow, red, and white have a good operation with voltage differences of 1.73\u2009V, 1.76\u2009V, and 1.13\u2009V in P1 and 1.58\u2009V, 1.84\u2009V, and 1.35\u2009V in P2, respectively. We calculate the mathematical model with the heights and solid concentration. The mathematical models which do not consider height present good R2. In conclusion, when the photosensor is located in the prototype, the height does not have an important effect and can detect the illicit discharge of solids. When the photosensor is located at 180\u00b0, it can be used for water with important changes in solid concentrations.<\/jats:p>","DOI":"10.1155\/2021\/6650157","type":"journal-article","created":{"date-parts":[[2021,3,11]],"date-time":"2021-03-11T15:20:13Z","timestamp":1615476013000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["A Low\u2010Cost Sensor for Detecting Illicit Discharge in Sewerage"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0182-1671","authenticated-orcid":false,"given":"Javier","family":"Rocher","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8697-6009","authenticated-orcid":false,"given":"Mar","family":"Parra","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9215-8734","authenticated-orcid":false,"given":"Lorena","family":"Parra","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9556-9088","authenticated-orcid":false,"given":"Sandra","family":"Sendra","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0862-0533","authenticated-orcid":false,"given":"Jaime","family":"Lloret","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8507-509X","authenticated-orcid":false,"given":"Jes\u00fas","family":"Mengual","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,3,11]]},"reference":[{"key":"e_1_2_9_1_2","doi-asserted-by":"publisher","DOI":"10.3390\/su9071240"},{"volume-title":"World Water Development Report 2020","year":"2020","author":"UNESCO","key":"e_1_2_9_2_2"},{"key":"e_1_2_9_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11356-016-7759-x"},{"key":"e_1_2_9_4_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11356-019-05802-x"},{"key":"e_1_2_9_5_2","unstructured":"European Council Directive 91\/271\/EEC of 21 May 1991 concerning urban waste-water treatment 1991."},{"key":"e_1_2_9_6_2","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph17031096"},{"key":"e_1_2_9_7_2","unstructured":"Toronto Water Sewers and water supply by-laws 2018 compliance and enforcement annual report and report on the Lavender Creek water quality assessment 2019."},{"volume-title":"Memoria De Entidad P\u00fablica De Saneamiento De Memoria De Gesti\u00f3n","year":"2019","author":"EPSAR","key":"e_1_2_9_8_2"},{"volume-title":"Wastewater Management: A UN-Water Analytical Brief","year":"2016","author":"UNESCO","key":"e_1_2_9_9_2"},{"volume-title":"Illicit Discharge Detection and Elimination: A Guidance Manual for Program Development and Technical Assessments","year":"2004","author":"Brown E.","key":"e_1_2_9_10_2"},{"key":"e_1_2_9_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.engappai.2011.09.016"},{"key":"e_1_2_9_12_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jenvman.2015.01.050"},{"key":"e_1_2_9_13_2","doi-asserted-by":"publisher","DOI":"10.2175\/106143013X13807328848496"},{"key":"e_1_2_9_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2018.07.448"},{"key":"e_1_2_9_15_2","doi-asserted-by":"publisher","DOI":"10.1080\/15275922.2019.1566295"},{"key":"e_1_2_9_16_2","doi-asserted-by":"crossref","unstructured":"RocherJ. 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