Part 1016: Design Rules – Bed Size & Vehicular Traffic

Env-Wq 1016.01 – Bed Size for Conventional Stone and Pipe Systems

The bed size for conventional stone and pipe systems shall be determined by the number of bedrooms, percolation rates, and total sewage flow per day as set forth in Table 1016-1 below.

Section Env-Wq 1016.09 – Vehicular Traffic

Universal Citation: NH Admin Rules Env-Wq 1016.09
Current through Register No. 26, June 26, 2025

(a) Heavy wheeled machinery and vehicles shall be excluded from the EDA unless the EDA has been specifically designed to withstand the weight.

(b) All machine grading of the site shall be completed before any components of the EDA are installed.

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Table 1016-1: Bed Size for Conventional Stone and Pipe Systems

Square Feet for Varying Loads and Percolation Rates

Begin Entry:
Percolation Rate (Minutes per Inch): 2 — Single-Family & Duplex (Up to 10 Bedrooms, 300 GPD) = 400 sq ft.

Ending Entry:
Percolation Rate = 60 — Single-Family & Duplex (Up to 10 Bedrooms, 4) = 3000 sq ft.

Table 1016-2: Approved Septic Stone Requirements

Sieve Size — Percent Passing by Weight:

2 inches – 100%
1.5 inches – 90 to 100%
¾ inch – 0 to 20%
#4 – 0 to 5%
#200 – 0 to 2%