Pendugaan Banjir, Erosi dan Sedimentasi pada Sub DAS Cigulung Maribaya Mempergunakan Model Simulasi "AGNPS" (Agricultural Non Point Model Simulasi Source Poluution Model)

Abstract

Flood, soil-erosion, and sedinientatiot~ aiialyses itre ge~ierally make hy using e~npi~iclanle tiiod with simple and lump pai.arnetric inotlcls. Recently, many distributed and "pliysically based" models wcrc dcvclo1)cd. AGNI'S is a coniputer sitnulatiori distributed model, developed to predict run-off volume, peak rate. erosion, delivered sediment, N, P and COD in the run-off for single stomi event at all cells in the waterslied. Corrclatio~i and pairecl test analyscs usiiiy 10 events pointed out that correlation between inodel output and nieasured peak rate gave the value of RZ = 0.3468 and no significant difference at 86.2 %. These analyses using 8 events gave the value of RZ = 0.9001 and no significatit difference at 98.7 %. Model output at initial wtldiGoii predicted erosion at Cigulung-Maribaya Sub-watershed over than maximum tolerable limit (30 Mgllia-year). Six land use sceiiari.os were si~iiulatcda rid used in AONI'S model in attempt to decrease flood, soil erosion, and sediinetitation.