Design Parameters of Sewerage for Environmental Engineering – II, Module 3 (Conveyance of Sewage)

Welcome back to Learn Civil Easy! In this lecture we cover the complete Design Parameters of Sewerage for Environmental Engineering – II, Module 3 (Conveyance of Sewage). Before any sewer line, treatment plant or pumping station can be designed, the engineer must fix the design period, forecast the population, estimate sewage and storm flows, and choose the right velocity and slope. We walk through every one of those parameters with derivations, CPHEEO-recommended values, formulas and worked examples — exactly the way GATE / ESE / PSU questions are framed. What you will learn: Three groups of design parameters — time, quantity, hydraulic Design period — CPHEEO values for STP, sewers, pumps, rising main Population forecasting — Arithmetic, Geometric, Incremental Increase, Decreasing Rate, Logistic Curve Per-capita sewage flow, return factor (K = 0.7–0.85), DWF Components of total flow — domestic, industrial, commercial, infiltration, inflow Variations in sewage flow — hourly, daily, seasonal Peak factor — Harmon's formula, Babbitt's formula, CPHEEO ladder Minimum flow factor for self-cleansing checks Storm-water design — Rational Method, runoff coefficient C, time of concentration Self-cleansing velocity (0.6–0.9 m/s) and Shield's equation Non-scouring velocity for clay, RCC, CI, brick, AC pipes Hydraulic formulas — Manning, Chezy, hydraulic radius for circle / square / rectangle Design discharge — sanitary, storm, combined sewers Worked numerical — population forecast and sewer sizing Coming up next on Module 3 — "Operation and Maintenance of Sewers": cleaning, ventilation, sewer gases (H₂S, CH₄, CO₂), corrosion control, manhole inspection and safety. Don't miss it! Subscribe to Learn Civil Easy →    / @learncivileasy   Join our Telegram for free notes, MCQs and updates → t.me/learncivileasy Like, share, and turn on notifications — new lectures every Tuesday, Thursday, and Saturday. #LearnCivilEasy #DesignParametersOfSewerage #DesignParametersOfSewage #EnvironmentalEngineering #ConveyanceOfSewage #SewerDesign #DesignPeriod #PopulationForecasting #HarmonFormula #PeakFactor #SelfCleansingVelocity #ManningFormula #RationalMethod #StormWaterDrainage #GATECivilEngineering #ESE2026 #PSU #SSCJE #SewerageEngineering