Construction and Testing of A Single and Double Ring Infiltrometers in Auchi Polytechnic, Edo State

doi:10.7176/jnsr/12-3-04

Abstract

This paper presents the results of the construction of an improvised double and single ring infiltrometers. The study was carried in Auchi Polytechnic campus, after the construction, the double ring and single ring infiltrometer were used to carryout infiltration tests at four different locations. The t-test was used to test check the performance of the double and single ring infiltrometers. The results of the soil properties showed that the soil texture was predominantly sandy loam and loam respectively. The result presented herein showed a high significant difference between the performance of the single and double ring infiltrometer at Plot A and no significant other plots. The total cumulative infiltration depth of the single-ring infiltrometer for the A, B, and C and D fields were 188.30 cm, 59.70 cm, 77.00 cm and 97.00 cm, respectively. The total cumulative infiltration depth of the Double-ring infiltrometer for the A, B, and C and D fields were 123.30 cm, 75.60 cm, 70.50 cm and 95.20 cm, respectively. Generally, Philip’s model performed better than Kostiakov’s model Keywords : Single and Double ring infiltrometer, infiltration models DOI: 10.7176/JNSR/12-3-04 Publication date: February 28 th 2021

Highlights

Infiltration is the process of water movement from the ground surface into the soil and is an important component in the hydrological cycle (Haghiabi et al, 2011)
Lili et al, (2008) reviewed the commonly used direct methods for measuring soil infiltration which include: single ring and double ring infiltrometers, mariotte-double ring infiltrometer, disc permeameter, rainfall simulator, runoff-on-ponding, runoff-on-out and linear source methods, the results obtained from field infiltration test and soil analysis are used for infiltration modeling
The general knowledge of the infiltration rate of soils has been obtained for many field conditions in the past, and results applied in many field works, there is dearth of information on the infiltration characteristics of soils within Auchi Polytechnic campus which would have aided engineers in hydrologic/hydraulic design of water disposal structures, soil management and erosion control works et cetera

Summary

Statistical Analysis and Model Validation

A comparative assessment of the performance of single and double ring infiltrometers will be carried out with ttest ANOVA using Microsoft excel 2010. In order to prove the performance of the models and their parameters, each model will be validated by comparing their simulated data with field measured data. From the two separate infiltration result obtained, one set of result was used for simulation and the second was used for model validation. The validation of the models will be done using: RMSE (root mean square error) and R2. R2 provides a measure of how well observed outcomes are replicated by the model; it ranges from 0 to 1. Where: Pi = predicted values, Õ = mean of the observed data, Oi = observed values, n = number of samples

Soil Properties

Field Measured Infiltration

Philip’s model

Model Validation

Findings

CONCLUSION